Chaotic Firebird

I know our motors don't like boost with their high compression. Trickflow has their boost friendly heads that lower compression.

Is anyone here running the stock motor with Trickflow heads and a bolt-on supercharger or turbo?

What's the new compression ratio with the Trickflow heads?

Would be cheaper/better to get Trickflow heads or lower compression pistons?

ecniv

iTrader: (1)

What size are the combustion chambers?

Chaotic Firebird

Summit's site say they are 62cc

Mike@TEA

The out of the box heads are 64cc. TEA has an 72cc chamber that can be cnc'd into the heads for FI use. The 72 cc chamber would yield around 9.7-1 on a stock shortblock with GM head gaskets. The 64 cc is about 10.7-1.

street demon2k3

iTrader: (3)

aren't the stock heads 54cc and yeild 10:1 CR? if you got some 64cc TFS heads then I would expect the CR to drop into the mid 9's. 72cc chambered heads would prolly go into the 8's without a problem, but that's for high boost applications I would think. Dont quote me on this, it might be wrong. Someone else will chime in I hope to correct me.

LT1MAN

iTrader: (6)

stock compression is 10.5

Brian Tooley Racing

iTrader: (13)

With a 67cc chamber....

F8L LT1 Z28

The stock lt1 is 10.5 to 1

The LT4 heads had smaller 54cc chambers that gave the LT4 a 10.8 to 1 compression ratio.

NemeSS

iTrader: (127)

dish forged pistons would be the most economic route,
for the price of the trick flow heads, u can rebuild your motor using
pressed type pistons along with quality bearings and rings,
if you are going FI, a rebuild and mill of the heads, with new springs and
a valve job and some quality rockers along with the stock type cam would
be good for over 550 bhp,
spend your money on your bottom end and some decent head gaskets,
head studs, and tune.

v7guy

iTrader: (1)

the stock heads are right around 54cc
there is some variation in the stock casting

RedLT4Mike

iTrader: (4)

Stock heads cc in the 50's not the 60's....

Why are there 2 tea guys saying otherwise????

This is the LT1 forum, not the Gen 1 Section

Dragframe

iTrader: (14)

put a bottom end under it and you could make 500's on stock heads.

94FBIRD

iTrader: (5)

Whoa, the TEA guys don't even know the CC or the stock compression ratio of the LT1? That's pretty cool. I measured the CC of my stock heads and those of my spare set of heads both measured out at 54 CCs. Give or take just a little. Does Mike@TEA post drunk?

Mike@TEA

Yep I'll have another beer. My bad I was thinking trickflows for the LS-1 didn't even notice what forum this was posted in.Sorry. Let me try to reanswer that: stock compression being 10.5 -1 calculated with a 55 cc chamber, the 62cc TFS head lower it to 9.69-1. TEA also has a CNC Chmber we can put in the head that measures around 67cc which will yield 9.2-1.

v7guy

iTrader: (1)

hell, i just looked it up and found several threads saying they were 54

strkt_&_blwn

iTrader: (10)

I ran my stock engine with 8 psi and had no problems, well until I didn't catch it overheating, and blew a head gasket. But that was my mistake thermostat stuck and I didn't catch it until it was too late. You just need to make sure that you get a good tune and keep it inner cooled. Like stated above I would use the stock heads and just port and polish them, revalve them to 202/160, and some good springs. Forge your lower end. Unless you're wanting to go into high boost I would keep your compression around 9.3 that's good for a solid 10-12 psi. Just my .02

protwin

I have a 383 with trick flow heads to lower my the comp to 9.7 to 1, a ati procharger ds1-c 12.6 pounds of boost with twin intercoolers. @5900 RPM. 60 LBS injectors a fuel management system, a good cam and tons of little things. My car is running great the dyno numbers were 601.2 RWHP & 564.7 LBS torque. I am really happy with it I have not ran it at the track because i stilll have the factory rear end that i have broke twice already.