tk350

I plant put 350 vortec to my boat ,would any one help me choice right cam for my engine I was thinking install camshaft parts number 14097395 ,is it right cam for my boat?

sprink58

What cam grinder's part number is that? If it's any help to you I run Comp Cams Extreme Marine 272 roller in my twin 355 Vortecs. I am very pleased with the performance.

befu

iTrader: (2)

I will have to look up what I put in my vortecs, that number looks familiar. If it is the same as mine, that is the stock cam to the 290 - 300 hp mercruiser engine, which is also used in a couple of GM crate motors. All that info is in a folder at work, I will look tomorrow.

Brian

79formula

I run a Comp Xtreme Marine 262 flat cam in my Vortec 355. I wish I would have went bigger. I would go 272-278 if i could do it again.

79formula

here is your cam. http://www.summitracing.com/parts/nal-14097395 I would go bigger. And also its a 109 cam, most marine cams are 112 lobe separation as to avoid reversion.

tk350

because I try to set up close to stock mercusier,if I go biger cam I had to change big valve spring ,and I think cam(14097395) I want to buy it right right for my engine?

befu

iTrader: (2)

He is correct, that is the stock mercruiser cam and that is what I run in my motors. You can find them on ebay sometimes as a brand new takeout as they are the stock cam on the 350 RamJet engine and the 383 truck engine also I believe. People buy the crate motors and then put a new cam in right away. I picked up a new take out for $90 to $100 shipped I believe, sometimes they are cheaper.

With the vortec heads and other L31 engine parts, I believe this is good for 290 - 300 HP depending on intake and carb. It is a pretty conservative cam for a 350 vortec, like others have mentioned you can build more power with a more aggressive cam, but I can attest to the fact that they idle nice and are very well behaved.

Brian

sprink58

You are correct...any lift over about .480 causes a bind in the lighter stock spring. Larger more robust springs require relieving the spring pocket to accept a more substantial and larger diameter spring.

tk350

thanks alot every one here ,your guys give me great importation

Pliant

A comp cam xm 276 would be as hot as one would want to go with wet exhasut a xm270 would be quite nice.You will notice it reqire's some modification's..and ground on a 112 lsa

http://www.carcraft.com/techarticles...pring_upgrade/

http://www.pacificp.com/forum/viewto...d21288c9eebedd

Page 2 is where the meat of the conversion come's to light

The below should be part of the thought process

http://www.perfprotech.com/blog/unca...d-and-checking

http://www.michel-christen.com/ExhaustElbows.pdf