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.

"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.

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.

"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.

"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

"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.

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.

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.

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.