Vette-byrd

Is this worth while with the lower comp of an LQ4?
car is a weekend toy with manual trans and Texas speed stage 3 cam. Anyone know what the comp ratio would be?
Currently have a sbe LQ4 with stage 3 cam listed above and 862 heads.

383z

iTrader: (2)

Yes, it's better than the those heads or any stock cathedrals in my opinion

G Atsma

It will be 9.53:1 with stock LS3 heads and LQ4 short block, figuring .052 HG and .00 deck clearance

Vette-byrd

What head gasket is that? I’ve got ls9 head gaskets fwiw.
is milling the ls3 heads an option to get more compression?

G Atsma

That is common LS HG thickness. Unless it's .051....

Vette-byrd

Any ideas how much power this combo should make?

BCNUL8R

iTrader: (2)

Probably make bigger peak numbers, but lose response and low end torque.

95wannabe

iTrader: (20)

Here's what mine did with a 222/230 emissions friendly cam. Heads milled only .005" for flatness. Same LS9 hg.

Vette-byrd

399hp 396 tq?
was that an LQ4 Shortblock?
engine dyno or?

wannafbody

iTrader: (2)

If NA, then a smaller chamber head would gain compression.

RedXray

The chart says "Dynojet" so it's a chassis dyno.

95wannabe

iTrader: (20)

Yes, everything stock except the cam/springs.
02 sbe LQ4
L92 heads milled .005
LS3 intake with Fast 92mm TB.
Chassis dyno and worth noting it's a 4l60e with small stall thru a 9"

BCNUL8R

iTrader: (2)

Those are small cam only 5.7 ls1 numbers.