more compression or more cubic inches a 350 is still a 350 i'm going with 9.9 to1 vortec all stock with flat tops(i hope it does'nt ping)
i was told below 5000rpm think compression and use the biggest engine you can .
beyond 5000rpm it's all about the air flow
more cam without more compression =a dog.a lame gas suckin dog!that just sounds cool at the dock.you may make gains with magic camshafts and higher rpm's but watch your compression if you end up lower you will not gain a thing. i think you just might be able to make as much torque&hp as a stock 9.4to1 vortech but i'm not an expert i'm a dirty plumber
screw reversion

hmmmmm I know those 9:1/355inch single carb Nascar Busch motors make some big power, admittidantly with some big rpm however..........doug

Changing cranks and rods won't get more HP. If I understand you correctly and you want to stay with 350 CID. Then punch the engine to .030" Put a fresh set of flattops in the engine. I would run the Dart Iron 180's. Little better head then the SR's. Get a set of Edelebrock Air gap intakes. Run 1.6 rockers on the intake side and 1.5's on the exhaust. It is all about moving air in quick to make power. Induction system.

Save your money and use the rods and cranks in the engines. Just have them reconditioned.

Chris

chris if i go your way how much hp?
and thanks to all you others for reasponding.
paul

travis im going with flat top

You should call Eddie Marine and tell them what you have told us. Based on the length of your risers and cam specs they should haven't any problem letting you know if you are safe or not. I would have thought that Eddie Marine would have questioned you on your cam specs and told you what to go with when you purchased them...If they didn't they should have. I am running the XM270 cam from comp cams and Stainless Marine manifolds and risers. I have no problem at all.

BH

I'm running 355'' with flat top L-82 pistons, 9.3:1, World SR 1.94/1.60 heads, Crane roller rockers, Speed Pro 460 lift/ 222intake 220 exhaust duration/ 112*lsa cam.
Had some efi problems with one but the one that was running well ran 5500 rpm with no complants. they started and idled well on 89 octane. I've done the cubes and compression route on the street..... which is way I don't want to do it on the water. Don't get me wrong if I were building a boat for a lake or short hops to the local watering hole, I'd go the with the set up Travis is running, BTW Travis have you seen the 450" Small Blocks yet?
One more thing the engine builder who is doing mine, built the same engine for his kid , less the roller rockers, and made 330 horse and 400 ft/lbs. on the dyno

ohh yeah.. I have seen them.. It just takes money.. and I don't have it LOL!

I'll have to go through my receipts to see what everything cost me. It wasn't too bad. If you're going to go with flattops, make sure you know what you're compression is going to be. 12:1 is cool, but where are you going to get the gas to run it? With 16cc dished pistons, 64cc heads, and .020" gaskets, I calculated my compression at 9.6:1. That works fine with 89 octane gas.

Paul, with what I have suggested should be a legit 70HP increase and 100#/ft of torque with max rpm set around 52 to 5400. . . useable power. Key is to get a matched camshaft to the head flow. I also recommend not buying assembled heads from the factory and just bolting them on. Nothing wrong with the work but as with any mass produced item, some attention to detail gets lost. Any good shop can disassemble and put a good valve job and mild blend work to pick up some easy power.

if you have any other questions you can e-mail me. .
[email protected]


Chris
Stef's Performance Oil Pan and Fabrication