bigantws6

iTrader: (12)

Its about time to order some set of heads and get a little more for nxt yr.having my trans rebuilt and stall recut to freshin it up

So far whats done is
233/234 598./598 112lsa
Qtp 1 3/4 headers
Exhaust Dual 2 1/4 with bullets
241 heads
Ls6 intake
Stock bottom end ls1
4k stall
3.23gears

Will be ordering a set of prc 2.5 5.3 a set of 3.90 or 4.11 not sure and will be putting a fast 90/90 on it what kind of gaind yall think i should see.best et to date is 7.6 @90mph on the 1/8th on full weight. Im doing alot of weight reduction should be around 3200lb when done

HCI2000SS

iTrader: (2)

On my old setup I had the same exact heads and cam as you, but with a LS6 intake. On a really crappy tune it made 405 rwhp on this particular dyno. With a better tune it was probably an honest 420 rwhp on the average Dynojet dyno. I have 4.10's as well

bigantws6

iTrader: (12)

Thats good was that threw a auto or 6spd what was ur best et on that setup

HCI2000SS

iTrader: (2)

That was through a 6-speed. I never got a chance to run it before the motor blew. So now I have the same heads but with a bigger cam and more compression on a 370ci LQ9. 90 mph for the mods you have and being full weight is pretty good. Those heads alone are probably worth 30-40 hp on average

bigantws6

iTrader: (12)

Thanks i hope i can get a 30hp to 40 would be good plus what ever i get on top with the fast 90 i want to get the car to do some 7.0 or 6.9 on motor but will see then ill throw some spray

HCI2000SS

iTrader: (2)

A Fast 90 will probably get you another 10-15 hp over the LS6. With those heads, better gearing, and some weight reduction a 6.9 is very doable. Shouldn't need spray

bigantws6

iTrader: (12)

Hopefully not sure if i want to do 3.90 or 4.11 im doing weight reduction but the only thing im doing to interior is remvoing carpet and going with a lighter carpet
Removing bumper support front and rear remvoing all heat shield
Top panhard
Removing door bar
Lighter rear hatch
And few more stuff

JakeFusion

iTrader: (7)

Make sure TSP has them... they posted a little while ago about not having anymore 5.3L cores.

HCI2000SS

iTrader: (2)

So doing lighter carpet alone will will get you down to 3200 lbs? If this is mainly a street car i'd personally go with the 3.90's, but if it mainly sees the track then 4.11's. That's just my opinion

bigantws6

iTrader: (12)

Oh okay

nm2769

iTrader: (1)

I called yesterday to order a set and I was told they can no longer get new 5.3 castings. They said GM discontinued them.

bigantws6

iTrader: (12)

Well my job not far from work i spend around 20 bucks a gas a week so that tells u how far it is lol and thats what i wanted to do was the 3.90 never done weight reduction but this is my first time so ill see how much it will weight in lol

bigantws6

iTrader: (12)

Dam guess ill have to find a set to work or ill get a set of prc ls6 2.5

bigantws6

iTrader: (12)

Looking at heads and i was seeing the prc 225 flow a little better than the 2.5 ls6 but caint find to much info on the prc225

nm2769

iTrader: (1)

search for prc as cast heads. Sounds like a good head only thing I dont like is that they are 6 bolt. Wont affect anything but I am weird like that and it would drive me nuts with the empty bolt hole.

nathanWS6

iTrader: (1)

I went with the 3.90and love it.. Also my set up threw down 424rwhp with stock fuel pump failing.. Getting upgraded fuel pump this weekend an back to dyno. Hoping to get another 10-20rwhp with bigger fuel pump.

bigantws6

iTrader: (12)

Thanks nathan i found some good threads and they make some pretty good power and fo 100 more they flow better than the 2.5 ls6 so with my cam might make some good power

bigantws6

iTrader: (12)

Nathan @60mph where u at on overdrive