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Chevy rebuilds
I have a 32' Luhrs Sportfisher. Currently with Chrysler 318 engines.
I have 2 Chevrolet 350 4 bolt marine engines, one standard, one reverse rotation. I would like to find out what spec. and what parts I need to build these engines to 280 to 300 hp on carburators. The boat weights 17000 lbs. It is my understanding I need foot lbs. of torque more than rpm. Anyone know if there is a guide or book? Anyone with information. Thanks in advance. |
Chevy rebuilds
"Tim" wrote in message ups.com... Are the 318's the old "Big Blocks"? if so, they are vertually the same blocks as the the 383's, 413,s qand 440's, which would be easier to overhaul and get the horsepower/torque you're looking for. The MoPar 318 came in a big block version? Never knew that. Eisboch |
Chevy rebuilds
wrote: I have a 32' Luhrs Sportfisher. Currently with Chrysler 318 engines. I have 2 Chevrolet 350 4 bolt marine engines, one standard, one reverse rotation. I would like to find out what spec. and what parts I need to build these engines to 280 to 300 hp on carburators. The boat weights 17000 lbs. It is my understanding I need foot lbs. of torque more than rpm. Anyone know if there is a guide or book? Anyone with information. Thanks in advance. I'm not really sure, but one thing I'd like to know, is why would you want to replace teh Chryslers with the chevys? Not saying one brand is superior to the other, but your mounting and manifolds and trans bolt patterns are completely different,a nd I would think that it would take a lot more work to change over the engines instead of rebuild the 318's. Are the 318's the old "Big Blocks"? if so, they are vertually the same blocks as the the 383's, 413,s qand 440's, which would be easier to overhaul and get the horsepower/torque you're looking for. If the 318's are the later "small block" versions, they are the same a block as the 360 and late 60's 274, and you might be strained on getting the results you desire. Just curious. |
Chevy rebuilds
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Chevy rebuilds
On Sat, 03 Nov 2007 15:26:12 -0400, Gene Kearns
wrote: If was contemplating throwing around that much ca$h, I wouldn't even consider a gasoline engine for a boat that large.... And that's a good point also. |
Chevy rebuilds
Eisboch wrote: "Tim" wrote in message ups.com... Are the 318's the old "Big Blocks"? if so, they are vertually the same blocks as the the 383's, 413,s qand 440's, which would be easier to overhaul and get the horsepower/torque you're looking for. The MoPar 318 came in a big block version? Never knew that. Eisboch Yes, Richard. As a matter of fact, they did. There was the 60's 318 "A" block, up intill I think about 1967 or '68, then chrylser happened to come out with the 318 "LA" in a small block version. Wich was essentially in the family of the 273(?) 340, 360 That;s like in the 60's, Pontiac had a 326 and the 389, and 428 had the same block same block |
Chevy rebuilds
Who's marine chevys are they? Are they late model with roller lifters?
Can't tell you what's in them with out knowing which ones they are. Gm makes them all but there are a number of variations depending on what year they are and who they were being sold to. When you say "build" do you mean hop up or do you mean complete rebuild? Cause a long block core is only worth a couple hundred bucks so I would consider other choices. Big blocks or a diesels would be a better fit. The factory small block marine cam is a decent cam. Not sure you could do much better. Add an aluminum manifold and a holley 700 and you might get it near your 280hp. You could bump up the compression a tad but not much given today's octane. Also if you underprop it a bit that might help. Hard to get a lot of torque out of small block anything. Here's my mouse motor but I'm probably only getting 280 or so hp out of it. I started with a 4 bolt truck core. Aftermarket pistons, pink rods, edlebrock intake and heads, holley, crane roller rockers, stainless exhaust. It has the factory marine roller cam but the rockers are 1.6 instead of 1.5. I had a aftermarket cam but it cost me low end. Went back to the factory cam. http://home.earthlink.net/~jamesgangnc/ebay/boateng.jpg wrote in message ups.com... I have a 32' Luhrs Sportfisher. Currently with Chrysler 318 engines. I have 2 Chevrolet 350 4 bolt marine engines, one standard, one reverse rotation. I would like to find out what spec. and what parts I need to build these engines to 280 to 300 hp on carburators. The boat weights 17000 lbs. It is my understanding I need foot lbs. of torque more than rpm. Anyone know if there is a guide or book? Anyone with information. Thanks in advance. |
Chevy rebuilds
On Sat, 3 Nov 2007 13:06:48 -0500, "Eisboch"
wrote: "Tim" wrote in message oups.com... Are the 318's the old "Big Blocks"? if so, they are vertually the same blocks as the the 383's, 413,s qand 440's, which would be easier to overhaul and get the horsepower/torque you're looking for. The MoPar 318 came in a big block version? Never knew that. As far as I know the 318 and 360 were always small block MOPAR engines. The 318 could produce up to 350 hp and the 360 could produce up to 450. As I understood it, the base big block was the 383 which could produce 525 horsepower with the 400 and 440 built off the 383 block. Howver, as always, I am probably wrong. |
Chevy rebuilds
On Sat, 03 Nov 2007 18:08:14 -0000, Tim wrote:
wrote: I have a 32' Luhrs Sportfisher. Currently with Chrysler 318 engines. I have 2 Chevrolet 350 4 bolt marine engines, one standard, one reverse rotation. I would like to find out what spec. and what parts I need to build these engines to 280 to 300 hp on carburators. The boat weights 17000 lbs. It is my understanding I need foot lbs. of torque more than rpm. Anyone know if there is a guide or book? Anyone with information. Thanks in advance. I'm not really sure, but one thing I'd like to know, is why would you want to replace teh Chryslers with the chevys? Not saying one brand is superior to the other, but your mounting and manifolds and trans bolt patterns are completely different,a nd I would think that it would take a lot more work to change over the engines instead of rebuild the 318's. Are the 318's the old "Big Blocks"? if so, they are vertually the same blocks as the the 383's, 413,s qand 440's, which would be easier to overhaul and get the horsepower/torque you're looking for. If the 318's are the later "small block" versions, they are the same a block as the 360 and late 60's 274, and you might be strained on getting the results you desire. Interesting - not that I don't believe you, but as far as I knew, MOPAR never built a big block 318. Then again, I'm not all that up on MOPAR stuff unless it involves the 440. |
Chevy rebuilds
On Sat, 03 Nov 2007 13:45:43 -0700, Tim wrote:
Eisboch wrote: "Tim" wrote in message ups.com... Are the 318's the old "Big Blocks"? if so, they are vertually the same blocks as the the 383's, 413,s qand 440's, which would be easier to overhaul and get the horsepower/torque you're looking for. The MoPar 318 came in a big block version? Never knew that. Eisboch Yes, Richard. As a matter of fact, they did. There was the 60's 318 "A" block, up intill I think about 1967 or '68, then chrylser happened to come out with the 318 "LA" in a small block version. Wich was essentially in the family of the 273(?) 340, 360 That;s like in the 60's, Pontiac had a 326 and the 389, and 428 had the same block same block Um - again, I'm not up on MOPAR stuff so I looked around a little and it confirmed what I do know. The "A" block that produced the 318 was the late '50s 303 block which, if I remember correctly, was small block. Yes/no? |
Chevy rebuilds
On Nov 3, 4:02?pm, Short Wave Sportfishing wrote:
On Sat, 03 Nov 2007 18:08:14 -0000, Tim wrote: wrote: I have a 32' Luhrs Sportfisher. Currently with Chrysler 318 engines. I have 2 Chevrolet 350 4 bolt marine engines, one standard, one reverse rotation. I would like to find out what spec. and what parts I need to build these engines to 280 to 300 hp on carburators. The boat weights 17000 lbs. It is my understanding I need foot lbs. of torque more than rpm. Anyone know if there is a guide or book? Anyone with information. Thanks in advance. I'm not really sure, but one thing I'd like to know, is why would you want to replace teh Chryslers with the chevys? Not saying one brand is superior to the other, but your mounting and manifolds and trans bolt patterns are completely different,a nd I would think that it would take a lot more work to change over the engines instead of rebuild the 318's. Are the 318's the old "Big Blocks"? if so, they are vertually the same blocks as the the 383's, 413,s qand 440's, which would be easier to overhaul and get the horsepower/torque you're looking for. If the 318's are the later "small block" versions, they are the same a block as the 360 and late 60's 274, and you might be strained on getting the results you desire. Interesting - not that I don't believe you, but as far as I knew, MOPAR never built a big block 318. Then again, I'm not all that up on MOPAR stuff unless it involves the 440.- Hide quoted text - - Show quoted text - http://www.sweptline.com/tech/engines.html Tom, Richard and everybody else. I DO STAND CORRECTED! The early 318 "A" was NOT clasified as a "Big Block" but rather a Polysphere (or Wideblock) 318. Obviously not the same as the 318 "LA" which was classed as a true "small block" but not the large 383-440 Big Block either, even though it did have heavier castings and big block "characteristics". But I'm still not sure if the 413 is in between the 383-440's or if it was an over punched wide block 318. Again I Humbly apologize. You learn something everyday. THANKS! Tim |
Chevy rebuilds
On Sat, 03 Nov 2007 17:43:13 -0700, Tim wrote:
On Nov 3, 4:02?pm, Short Wave Sportfishing wrote: On Sat, 03 Nov 2007 18:08:14 -0000, Tim wrote: wrote: I have a 32' Luhrs Sportfisher. Currently with Chrysler 318 engines. I have 2 Chevrolet 350 4 bolt marine engines, one standard, one reverse rotation. I would like to find out what spec. and what parts I need to build these engines to 280 to 300 hp on carburators. The boat weights 17000 lbs. It is my understanding I need foot lbs. of torque more than rpm. Anyone know if there is a guide or book? Anyone with information. Thanks in advance. I'm not really sure, but one thing I'd like to know, is why would you want to replace teh Chryslers with the chevys? Not saying one brand is superior to the other, but your mounting and manifolds and trans bolt patterns are completely different,a nd I would think that it would take a lot more work to change over the engines instead of rebuild the 318's. Are the 318's the old "Big Blocks"? if so, they are vertually the same blocks as the the 383's, 413,s qand 440's, which would be easier to overhaul and get the horsepower/torque you're looking for. If the 318's are the later "small block" versions, they are the same a block as the 360 and late 60's 274, and you might be strained on getting the results you desire. Interesting - not that I don't believe you, but as far as I knew, MOPAR never built a big block 318. Then again, I'm not all that up on MOPAR stuff unless it involves the 440.- Hide quoted text - - Show quoted text - http://www.sweptline.com/tech/engines.html Tom, Richard and everybody else. I DO STAND CORRECTED! The early 318 "A" was NOT clasified as a "Big Block" but rather a Polysphere (or Wideblock) 318. Obviously not the same as the 318 "LA" which was classed as a true "small block" but not the large 383-440 Big Block either, even though it did have heavier castings and big block "characteristics". But I'm still not sure if the 413 is in between the 383-440's or if it was an over punched wide block 318. Again I Humbly apologize. You learn something everyday. No reason to apologize - all those different engines of the day were simply amazing. There aren't very many "classic" engines, but certainly the 318 stands alone as the best engine ever developed. I might rank the 220 slant six as one and the 220 Silver Diamond International six as another. Also considered - 327, 350 and the great 564 International/Ford truck engine along with the 7.3 liter diesel. |
Chevy rebuilds
"Short Wave Sportfishing" wrote in message ... On Sat, 03 Nov 2007 13:45:43 -0700, Tim wrote: Eisboch wrote: "Tim" wrote in message ups.com... Are the 318's the old "Big Blocks"? if so, they are vertually the same blocks as the the 383's, 413,s qand 440's, which would be easier to overhaul and get the horsepower/torque you're looking for. The MoPar 318 came in a big block version? Never knew that. Eisboch Yes, Richard. As a matter of fact, they did. There was the 60's 318 "A" block, up intill I think about 1967 or '68, then chrylser happened to come out with the 318 "LA" in a small block version. Wich was essentially in the family of the 273(?) 340, 360 That;s like in the 60's, Pontiac had a 326 and the 389, and 428 had the same block same block Um - again, I'm not up on MOPAR stuff so I looked around a little and it confirmed what I do know. The "A" block that produced the 318 was the late '50s 303 block which, if I remember correctly, was small block. Yes/no? That's what I always thought. The original 318 "A" engine came out in 1956 or '57 and I am quite sure it was a small block. The "LA" version of the 318 was also a small block. The 318 and 360 were essential the same engine blocks with different heads. I would be very surprised if there was a 318 that shared the same block as the 440. Eisboch |
Chevy rebuilds
"Short Wave Sportfishing" wrote in message ... On Sat, 3 Nov 2007 13:06:48 -0500, "Eisboch" wrote: "Tim" wrote in message roups.com... Are the 318's the old "Big Blocks"? if so, they are vertually the same blocks as the the 383's, 413,s qand 440's, which would be easier to overhaul and get the horsepower/torque you're looking for. The MoPar 318 came in a big block version? Never knew that. As far as I know the 318 and 360 were always small block MOPAR engines. The 318 could produce up to 350 hp and the 360 could produce up to 450. As I understood it, the base big block was the 383 which could produce 525 horsepower with the 400 and 440 built off the 383 block. Howver, as always, I am probably wrong. You're corrent. Eisboch |
Chevy rebuilds
"Short Wave Sportfishing" wrote in message ... There aren't very many "classic" engines, but certainly the 318 stands alone as the best engine ever developed. I might rank the 220 slant six as one and the 220 Silver Diamond International six as another. Also considered - 327, 350 and the great 564 International/Ford truck engine along with the 7.3 liter diesel. I'd thrown in Ford's 260/289/302 as well. The 289 powered many cars, large and small. Eisboch |
Chevy rebuilds
On Sun, 4 Nov 2007 05:48:39 -0500, "Eisboch"
wrote: "Short Wave Sportfishing" wrote in message .. . There aren't very many "classic" engines, but certainly the 318 stands alone as the best engine ever developed. I might rank the 220 slant six as one and the 220 Silver Diamond International six as another. Also considered - 327, 350 and the great 564 International/Ford truck engine along with the 7.3 liter diesel. I'd thrown in Ford's 260/289/302 as well. The 289 powered many cars, large and small. Agreed. |
Chevy rebuilds
On Nov 4, 5:08 am, Short Wave Sportfishing wrote:
On Sun, 4 Nov 2007 05:48:39 -0500, "Eisboch" wrote: "Short Wave Sportfishing" wrote in message .. . There aren't very many "classic" engines, but certainly the 318 stands alone as the best engine ever developed. I might rank the 220 slant six as one and the 220 Silver Diamond International six as another. Also considered - 327, 350 and the great 564 International/Ford truck engine along with the 7.3 liter diesel. I'd thrown in Ford's 260/289/302 as well. The 289 powered many cars, large and small. Agreed. the 390 wasn't bad either. the 351 Cleveland was a good all around performance engine, and tthe 351 Windsor wasnt' that hot but was a fairly reliable workhorse. hmmm, two completely different 351's |
Chevy rebuilds
On Sun, 4 Nov 2007 05:48:39 -0500, "Eisboch"
wrote: "Short Wave Sportfishing" wrote in message .. . There aren't very many "classic" engines, but certainly the 318 stands alone as the best engine ever developed. I might rank the 220 slant six as one and the 220 Silver Diamond International six as another. Also considered - 327, 350 and the great 564 International/Ford truck engine along with the 7.3 liter diesel. I'd thrown in Ford's 260/289/302 as well. The 289 powered many cars, large and small. For numbers powered the GM 2.8/3.1 might be there. I saw a car magazine (Car & Driver?) article about a year ago that was titled something like "the top 10 engines of all time." I remember the GM 3800 (maybe 3.8) and the Nissan 3.0 were 2 of them, but can't remember much else. I've put most of my miles on 2.8/3.1's, with 350's next. --Vic |
Chevy rebuilds
On Nov 3, 1:27 pm, Wayne.B wrote:
On Sat, 03 Nov 2007 10:57:15 -0700, wrote: I have a 32' Luhrs Sportfisher. Currently with Chrysler 318 engines. I have 2 Chevrolet 350 4 bolt marine engines, one standard, one reverse rotation. I would like to find out what spec. and what parts I need to build these engines to 280 to 300 hp on carburators. The boat weights 17000 lbs. It is my understanding I need foot lbs. of torque more than rpm. Anyone know if there is a guide or book? Anyone with information. Thanks in advance. The most I've seen from a carburated 350 is 260 hp. You can get 300 to 320 with multi-port fuel injection, maybe more. With 17,000 lbs of weight you'll be a lot better off with 454s or even bigger. My old Bertram 33 weighed 21,000 and it was only a marginal performer with 350 hp 454s. I had 350's with carbs and 300 hp, it's not difficult. A better choice is to make those 350's into 383's, plenty of torque at low RPM's and still light weight. Even better, if you can find them, small block 400's. But to do any of this you need a good engine shop that knows marine engines. Their's so many choices of heads, valve sizes, cam shafts. About five years ago I had a shop I've been dealing with for years build me 300 hp 350's, completely remachined, new sheet metal, pistons rings cams, bearings timing gears and chain, oil pumps, ect. Bottom line, $2500 each, I'd probably bet their about $3000 each now. The best thing about 350's are the parts are cheap!!! |
Chevy rebuilds
On Mon, 05 Nov 2007 09:26:15 -0800, Capt John
wrote: About five years ago I had a shop I've been dealing with for years build me 300 hp 350's, completely remachined, new sheet metal, pistons rings cams, bearings timing gears and chain, oil pumps, ect. I'm sure there are people who can get that kind of power but it can't be easy or durability/operability is compromised in some way. If it was easy Mercruiser would be doing it and they're not. One of the challenges is maintaining low end torque while you hop up the high end. Another issue is what happens to durability if you have to run at 5000 RPM to get the 300 hp. I have a 6.2L MPI (about 373 cid) that Mercruiser rates at 320 hp, so 300 hp out of a carburated 350 is a bit of a stretch. |
Chevy rebuilds
"Wayne.B" wrote in message ... On Mon, 05 Nov 2007 09:26:15 -0800, Capt John wrote: About five years ago I had a shop I've been dealing with for years build me 300 hp 350's, completely remachined, new sheet metal, pistons rings cams, bearings timing gears and chain, oil pumps, ect. I'm sure there are people who can get that kind of power but it can't be easy or durability/operability is compromised in some way. If it was easy Mercruiser would be doing it and they're not. One of the challenges is maintaining low end torque while you hop up the high end. Another issue is what happens to durability if you have to run at 5000 RPM to get the 300 hp. I have a 6.2L MPI (about 373 cid) that Mercruiser rates at 320 hp, so 300 hp out of a carburated 350 is a bit of a stretch. Not really. My 350 MPI engine is rated 330 hp. http://www.michiganmotorz.com/Marine...07+replacement) 315 hp. But they are Vortec base engines. |
Chevy rebuilds
Notice the MPI? That measn multiport injected. Not carburated. He said
carburated. "Calif Bill" wrote in message ... "Wayne.B" wrote in message ... On Mon, 05 Nov 2007 09:26:15 -0800, Capt John wrote: About five years ago I had a shop I've been dealing with for years build me 300 hp 350's, completely remachined, new sheet metal, pistons rings cams, bearings timing gears and chain, oil pumps, ect. I'm sure there are people who can get that kind of power but it can't be easy or durability/operability is compromised in some way. If it was easy Mercruiser would be doing it and they're not. One of the challenges is maintaining low end torque while you hop up the high end. Another issue is what happens to durability if you have to run at 5000 RPM to get the 300 hp. I have a 6.2L MPI (about 373 cid) that Mercruiser rates at 320 hp, so 300 hp out of a carburated 350 is a bit of a stretch. Not really. My 350 MPI engine is rated 330 hp. http://www.michiganmotorz.com/Marine...07+replacement) 315 hp. But they are Vortec base engines. |
Chevy rebuilds
The 400's have siamesed cylinders so they are not very popular in the marine
world. They have cooling problems right where the cylinders meet which is also right where head gaskets tend to blow out on small blocks. The stroked 383 is a pretty good configuration but don't expect miracles. It is just a slightly longer stroke and 33 more cubic inches. The basic problem is still that the small blocks really like to make hp with rpm's and there is a limit to what you can do to get hp at low rpm with them. It's an unavoidable problem when combined with a big heavy boat. That's why higher displacement is really the way to go in a big boat. I think the op is gone anyway. "Capt John" wrote in message ups.com... On Nov 3, 1:27 pm, Wayne.B wrote: On Sat, 03 Nov 2007 10:57:15 -0700, wrote: I have a 32' Luhrs Sportfisher. Currently with Chrysler 318 engines. I have 2 Chevrolet 350 4 bolt marine engines, one standard, one reverse rotation. I would like to find out what spec. and what parts I need to build these engines to 280 to 300 hp on carburators. The boat weights 17000 lbs. It is my understanding I need foot lbs. of torque more than rpm. Anyone know if there is a guide or book? Anyone with information. Thanks in advance. The most I've seen from a carburated 350 is 260 hp. You can get 300 to 320 with multi-port fuel injection, maybe more. With 17,000 lbs of weight you'll be a lot better off with 454s or even bigger. My old Bertram 33 weighed 21,000 and it was only a marginal performer with 350 hp 454s. I had 350's with carbs and 300 hp, it's not difficult. A better choice is to make those 350's into 383's, plenty of torque at low RPM's and still light weight. Even better, if you can find them, small block 400's. But to do any of this you need a good engine shop that knows marine engines. Their's so many choices of heads, valve sizes, cam shafts. About five years ago I had a shop I've been dealing with for years build me 300 hp 350's, completely remachined, new sheet metal, pistons rings cams, bearings timing gears and chain, oil pumps, ect. Bottom line, $2500 each, I'd probably bet their about $3000 each now. The best thing about 350's are the parts are cheap!!! |
Chevy rebuilds
"jamesgangnc" wrote in message ... Notice the MPI? That measn multiport injected. Not carburated. He said carburated. "Calif Bill" wrote in message ... "Wayne.B" wrote in message ... On Mon, 05 Nov 2007 09:26:15 -0800, Capt John wrote: About five years ago I had a shop I've been dealing with for years build me 300 hp 350's, completely remachined, new sheet metal, pistons rings cams, bearings timing gears and chain, oil pumps, ect. I'm sure there are people who can get that kind of power but it can't be easy or durability/operability is compromised in some way. If it was easy Mercruiser would be doing it and they're not. One of the challenges is maintaining low end torque while you hop up the high end. Another issue is what happens to durability if you have to run at 5000 RPM to get the 300 hp. I have a 6.2L MPI (about 373 cid) that Mercruiser rates at 320 hp, so 300 hp out of a carburated 350 is a bit of a stretch. Not really. My 350 MPI engine is rated 330 hp. http://www.michiganmotorz.com/Marine...07+replacement) 315 hp. But they are Vortec base engines. I said mine was the MPI. The link is to a 315 hp carbed motor. And the 400's sucked in cars also, the cooling left a lot to be desired. |
Chevy rebuilds
"Calif Bill" wrote in message ... I said mine was the MPI. The link is to a 315 hp carbed motor. And the 400's sucked in cars also, the cooling left a lot to be desired. Ahem. GM built two different "400's". The first was unique to Pontiac, was a big block and was used starting in 1967 in the GTO. It was a slightly bigger version of the 389 but had improved heads with larger valves for improved breathing. The "other" 400 ci, to which you are most likely referring, is a bored small block and indeed, had some problems. Eisboch |
Chevy rebuilds
Calif Bill wrote: I said mine was the MPI. The link is to a 315 hp carbed motor. And the 400's sucked in cars also, the cooling left a lot to be desired. a person could probably use a 400 on a fresh water system with no much problem with cooling, but the blocks are thin, like it was factory bored about as far as one would want to take it. I never was impressed with the 400 Chevy. |
Chevy rebuilds
"Eisboch" wrote in message ... "Calif Bill" wrote in message ... I said mine was the MPI. The link is to a 315 hp carbed motor. And the 400's sucked in cars also, the cooling left a lot to be desired. Ahem. GM built two different "400's". The first was unique to Pontiac, was a big block and was used starting in 1967 in the GTO. It was a slightly bigger version of the 389 but had improved heads with larger valves for improved breathing. The "other" 400 ci, to which you are most likely referring, is a bored small block and indeed, had some problems. Eisboch Forgot about the Pontiac 400. |
Chevy rebuilds
The cylinders were cast joined to each other all the way down so it could be
bored bigger. That reduced the cooling flow around the cylinders. "Tim" wrote in message ups.com... Calif Bill wrote: I said mine was the MPI. The link is to a 315 hp carbed motor. And the 400's sucked in cars also, the cooling left a lot to be desired. a person could probably use a 400 on a fresh water system with no much problem with cooling, but the blocks are thin, like it was factory bored about as far as one would want to take it. I never was impressed with the 400 Chevy. |
Chevy rebuilds
The link just says "invalid serach conditions" A 300+ hp carburated 350 is
reasonable though. The vortex heads are pretty good. "Calif Bill" wrote in message ... "jamesgangnc" wrote in message ... Notice the MPI? That measn multiport injected. Not carburated. He said carburated. "Calif Bill" wrote in message ... "Wayne.B" wrote in message ... On Mon, 05 Nov 2007 09:26:15 -0800, Capt John wrote: About five years ago I had a shop I've been dealing with for years build me 300 hp 350's, completely remachined, new sheet metal, pistons rings cams, bearings timing gears and chain, oil pumps, ect. I'm sure there are people who can get that kind of power but it can't be easy or durability/operability is compromised in some way. If it was easy Mercruiser would be doing it and they're not. One of the challenges is maintaining low end torque while you hop up the high end. Another issue is what happens to durability if you have to run at 5000 RPM to get the 300 hp. I have a 6.2L MPI (about 373 cid) that Mercruiser rates at 320 hp, so 300 hp out of a carburated 350 is a bit of a stretch. Not really. My 350 MPI engine is rated 330 hp. http://www.michiganmotorz.com/Marine...07+replacement) 315 hp. But they are Vortec base engines. I said mine was the MPI. The link is to a 315 hp carbed motor. And the 400's sucked in cars also, the cooling left a lot to be desired. |
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