The Rookie24

as the title states I'm considering getting my 317 heads cnc ported with bigger valves i got one price for around 1500 bucks is it worth it? I'm building a lq4 with a single turbo looking for 650 to the wheels on low boost

1320king

iTrader: (4)

650 to the wheels i wouldnt bother. Even if it is low boost. Spend the money on other parts like properly specked cam, turbo and stuff like that. Plenty of guys making great #'s on stock casting 317's.

The Rookie24

yea i know but i really only plan on putting this together once and if i ever get the urge to jus go insane with a massive turbo or twins that all the internal stuff is good for it so at most it would be changing the manifold and maybe the cam is 1500 reasonable for getting cnc porting this what i was told by TEA

I would suggest the stage 2 program with the bigger 2.04"/1.575 valve package for the build. The cost would be $1585.00 to port and work over your castings.

MUSTANGBRKR02

iTrader: (91)

and in the end you have stock castings.

I say go TFS 220 as cast

oscs

iTrader: (19)

If you have the urge to throw more power at it down the road than your $1500 is defiantly better spent elsewhere like valve train/cam/fuel etc. The 317's will flow pretty decent number untouched.

Heavy H.P.

Who were you going get to port them?

ablakez28

iTrader: (9)

I made 670 on 10psi and 888 on 18psi with bone stock 317s earlier this year.

willizm

iTrader: (10)

I agree with everyone else. Use that 1500 toward a better fuel system. It's really not needed for 317's. What intake manifold are you going with? Fwiw I'm running 9's with 317's that were just cleaned up.

ablakez28

iTrader: (9)

+1 I went 9.0 On stock 317s not even cleaned up.

Next season I am trying a set of CNC ported LS3 heads that I had kicking around so I will have more of a comparison although different design.

Kmspeedie

iTrader: (1)

this makes me feel better using stock 317's..ive heard they flow great force fed

dwayneogles

iTrader: (10)

i just had my 317s cnc'd 226 intake 232 exhaust from advanced inductions for $999 also knocked down the chambers to 65cc's to get the compression up a little maybe check them out? you will make more power without having to push the blower harder to make it if you do the heads

The Rookie24

total engine air flow was who gave me that price and i was gunna run a ls6 intake and a custom cam and like dwayneogles said i could make the same or more power with less boost I'm jus super meticulous lol i have a guy who does porting posing for cheap should i just send them to him jus clean it up Ablakez28 whats your set up ??

oscs

iTrader: (19)

If 20lb or less will get you to your goal than why are you so concerned with low boost on a 650hp goal?

The Rookie24

I would just like to be able to start around that area hp and the easier i can make it for the engine and turbo i would like to do you get what I'm saying I'm not like set in stone on that hp to start but while the engine is completely apart i figure id ask you guys and I'm in no rush to put it back because its a project and not my dd
also ill be running off 93

Black_Phantom

I would save up for a set of thick aftermarket castings, The stock casting good for you now and that power level but when you wanna start to push it you're gonna need some thicker, Stronger Heads.

So just do it once even if you have to wait a little and use what you have for now.

The Rookie24

would i really need new heads as Ablakez28 posted he put down 888 to me that right around the most i would want or need can the 317s not handle that power reliably?

MUSTANGBRKR02

iTrader: (91)

Guys have put over a 1k on 317's but you keep stating that you want it to flow better to require less boost. If you are set on getting heads then save and buy aftermarket.

ablakez28

iTrader: (9)

I have a build on here somewhere I think. Also I will say I made over the 888 number at the track im sure as i turned it up and went higher mph. Dyno was 18-19psi track went to 21ish.

Anyhow
LQ4, Ls9 gaskets, china studs, speed inc tu 1.5 cam, cast S480 1.32 ar
Went 125mph in the 1/8th and 9.0 150mph 1/4 on the limiter

turbobass

same for me 650 whp at 11 psi bone stock head and came with 6.0 lq4
gt4718r


bass