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.

"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

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.

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.

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.

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

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.

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.

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.

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?