I Know basic car engine should not be used but what about a HI-Output Quality Engine?

425hp 383 Small Block


The all new ZZ383 offers Big Block performance with a Small Block price tag. GMPP starts with the legendary Fast Burn cylinder heads and 383cid, to offer an incredible 460 ft. lbs. of torque @ 4500 rpm with a smooth, linier delivery.

The combination of a 3.800 steel crank and a stout .509/.528 lift hydraulic roller camshaft produces 425hp @ 5400 rpm, making the ZZ383 the benchmark by which all other 383cid small blocks will be measured. GMs testing was completed using a GM single-plane intake manifold, a 750cfm Demon mechanical secondary carb, and 1-3/4 primary x 33 length headers with a 4 collector. A dual-plane intake manifold can be used, but will affect overall peak performance numbers by 15-20 HP.

TECH SPECS: *Horsepower: 425 @ 5400 *Torque: 460 @ 4500 *Max. Recommended RPM: 6000 *Compression Ratio: 9.1:1 *Crankshaft: Forged Steel *Connecting Rods: 10108688 PM Rods. *Camshaft 12370846 (hydraulic roller): -Gross Lift (.509 I / .528 E.) -Duration @ .050 (222 I / 230 E). *Cylinder Heads: 12464298 aluminum 62cc. combustion chambers. *Rockers: 1.5:1 Roller Rocker *Four bolt main block *Powdered Metal Connecting Rods *8 Balancer *GM aluminum single-plane intake manifold.

Yes, It doesn't no whats it is in, some people may say no. Most marine engines do have different cams (more duration) then a car engine, but I think it will work fine, I would put a set of steel heads, intake on it unless you have fwc system or it will be run in fesh water, casue salt loves luminum. Just my .2

I should have added that; I do Boat In Fresh Water Only.

ohh and forgot to mention make sure it has brass freeze plugs, but that one looks like it does..

I think you have that backwards, marine engines have less duration so they do not revert water from the exhaust

383 with 425 hp will have too much cam and will revert water into the exhaust.

I think so too...

That 383 actually uses the same Crane cam that many have found to be really good on many 350, 383, and 406 performance marine engine builds.

Speaking of reversion, all the builds I've seen that use this cam make enough hp that the OEM Merc exhaust manifolds are long gone, so, yes, I guess it's possible that it may be an issue with stock exhaust. I don't know to be honest. Any SBC over 350hp really should have a better exhaust on it.

Anyway, the good news is there is a Merc rep that currently has one of these 383 / 425 motors in his 22 Pachanga.

2 Trick Rick - if you are the same person asking about this over on SW I PM'd you the thread that contains this person's contact information.

Here's the thread:

See post #9:
http://www.speedwake.com/upload/show...&highlight=383

Yes, Thats me - Thanks for the read.