supersick99z

iTrader: (66)

I have been gathering parts for my 76mm turbo build and really don't want to have to pull my current heads. They are Patriot stg 2 5.3's at 63cc from patriot, but may have been milled to 59cc by previous owner I'm not 100% sure. Any reason I couldn't use them with a ls6 cam or is compression going to be a factor. Looking to stay pump gas and shooting for 550-575 HP wise on stock bottom end. Open to input!

MUSTANGBRKR02

iTrader: (91)

Only real problem if they are milled is deck thickness. 317's are pretty easy to come by. I have some and am in NC too. Already have springs on them aswell.

Z28-4-Chris

iTrader: (2)

Ditch them. Pick up the 317's from MustangBrk02. I have a turbo build going on right now with my GTO and I have 5.3L heads as well, but they weren't milled. I think my CR is right around 10:7:1.

67Firebird455

iTrader: (27)

Definitely drop that compression. That small a chamber would only be good if this was an alcohol car. =\

supersick99z

iTrader: (66)

This is my first turbo car so it will be a learner experience to say the least lol. Just got a job at the police dept so 4 days on 4 days off will allow plenty of time to build it! I've actually been looking at a few sets of 317 heads and I'll just sale mine to recoup some cost. Another question....

Arp head studs or arp head bolts?

67Firebird455

iTrader: (27)

Grab studs, a lot of guys are using ebay (KMJ) head studs with great results.

supersick99z

iTrader: (66)

Yeah I saw a few threads about the ebay ones and naturally they get bashed instantly because of where you can buy them

67Firebird455

iTrader: (27)

Run it man! In another thread today, fella got a set of Alper studs for $65 shipped. That is really hard to beat for a set of studs.

p8ntslinger676

Just food for thought, why not use the money on some good dished pistons and rods instead of another set of heads and freshen up the bottom end that way you have some peace of mind instead. That way you can daily it without issue an crank up the boost if you feel like it.

supersick99z

iTrader: (66)

Not looking to tear into the bottom end until the stock one lets go. Car will be a weekend car, I only drive it about 1-2 times a month as it is

Texhotrod593

iTrader: (7)

Does anyone actually know what the original deck thickness of these stg 2.5 5.3ltr heads are when unmilled and untouched? Do they compare to 317's or better like a trick flow or afr?

p8ntslinger676

From what i know all of the stock castings are about .4" where as the aftermarket ones are usually around .75" which is quite a big difference when you're looking at rigidity and preventing the heads from lifting. And the LSA and LS9 heads are both roto cast with a better quality aluminum for a stronger casting. If you have the money it is usually a better idea to just go to a good quality aftermarket casting.

Texhotrod593

iTrader: (7)

Thank you sir!