squale iii

I need to know which heads to run on my 408 I'm about to have built. Eventually I'd like to get a procharger/turbo. Everything I read says 317's for boost...However I can't find anything regarding PORTED 241's vs stock 317's. Any advise would be appreciated. Thanks.

lemons12

iTrader: (71)

Well ported 241s will outflow stock 317s pretty easily.

HCI2000SS

iTrader: (2)

You want to know how ported 241's compare to stock 317's with boost or n/a?

squale iii

Well it's going to be going on a built 408 short block. I have an aftermarket camshaft going in (it was considered fairly aggressive for a stock LS1 without flycut pistons). Obviously not the best cam for this build, but it will be better than stock I'd imagine. It will be n/a for a few years is my guess until I can piece together a procharger/turbo kit.

squale iii

Ok so I don't feel so bad for sinking that money into those heads now. If I had known all this was going to happen I'd have had the 317's ported obviously. But whats done is done.

HCI2000SS

iTrader: (2)

Well like mentioned above ported 241's will do better on that setup n/a

squale iii

But are they going to restrict me horribly when I do boost it?

HCI2000SS

iTrader: (2)

It depends on how much they're milled, how much boost, compression, etc...

squale iii

241's were milled .020. Like to make 800-1000whp with the 408. Not sure what psi that would be depends on what route I go and part selection I'd imagine.

lemons12

iTrader: (71)

Milled heads will not play well with boost... Especially at 18+# , which you will need for that power level.

You're going about this all wrong.

Do whatever you want for na. When/if you have the money to step into forced induction, change what is needed then.

HCI2000SS

iTrader: (2)

Yeah if if you wanna make 800 plus you want lower compression, so those milled 241's aren't going to do well

Camaro99SS

iTrader: (4)

Go with the 317's, basically a boost friendly LS2 head. You can always have them ported down the road.

Jason

Rise of the Phoenix

iTrader: (27)

This sounds like a very mismatched combo. Sell the 241's and get some 317's. They don't need to be ported to make big numbers with boost.

KCS

iTrader: (20)

The 241's won't be a problem. Just choose a piston with enough of a dish to give you the compression you want.