spiro27

trying to decide what head to put on my ls1. i have decided on a tsb 224r cam because of emmisions. what heads do you guy rec prc 5.3 2.5 or prc ls6 2.5? and what should i get them milled to. is it safe to rum these heads with bigger valves with the 224r cam. what head gasket thikiness should i use. i also plan on using arp head bolts. i already have all the bolt ons on my car and its a manual. thanks for help.

trans_am7935

iTrader: (15)

well i will tell u that they are both good heads, but for the price, the 5.3 heads will be your best bet. that is a baby cam and you can run alot of compression with it. get the 5.3's @ 60cc and the .040 cometic head gaskets. you will be just around 11.4:1 compression with that combo and make more power (and fuel economy) alone with the compression over the LS6 head. also will make better torque. so for the money, the 5.3 has my vote

Bluvette28

iTrader: (8)

I go with the 5.3 also trans am7935 hit it right on the money

Jon@Texas-Speed

iTrader: (18)

The LS6 heads should make a little more power. We can mill them to get the same compression as the 5.3 heads and keep plenty of PTV for you. It really comes down to how much power you are chasing and your budget. For the money the 5.3L heads are hard to beat. But if you are chasing a number, the LS6 will make better power. Either way, I'm sure you'll be happy with your purchase. Let me know if you have any questions and we'll get you fixed up!

Jon

spiro27

im looking to make 450 rwhp would it be obtainable with 5.3 2.5. whould the ls6 2.5 make more. i alread have all the bolt ons so far. which heads would make more torqe.

180ls1

iTrader: (4)

Man that is going to be tough with a 224 cam. What intake are you running? I would say get the ls6 heads then, the will make more power then the 5.3's.

Have you ordered the cam yet, if your shooting for 450 i would suggest something a little bigger.

spiro27

i still have to pass emissions i think the biggest i can go is a 228. worst case i would be in the 420rwhp? i have a ls6 intake. but i will go to lsx 102 eventually with bigger injectors. i alread have kooks 1/78 headders slp loud mouth exhaust slp lid below and maf. you think i would be in 420 range. right now with this setup.then if i upgrade later to lsx manifoild and tb injectors i should be 450?

spiro27

would it still be streetable at that power level