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Hey guys,

Just curious how with everything else being the same how much more power my engine could pick up with a compression bump from just under 9:1 up to about 10.5:1? The current configuration has the pistons below the deck about .083". So with the new compression I would be zero decked with about .040" quench. Here is a mild run down of the engine...best time is in my sig...guessing at about 320hp at the wheels

1991 360 Roller block
Bone stock bottom end
9:1 compression
RHS heads prepped by Brian at IMM engines
custom ground hydraulic roller from Brian at IMM with specs as follows:

Gross Valve lift with 1.6 rocker arms- 577 int., 569 exh.
Duration at .050”- 230/230
Lobe Separation- 106
Cam installed at 101 Intake Centerline (5 degrees of advance ground into cam)

Topped off with an Eddy air gap, Holley 750HP, 1-5/8's headers, 3" exhaust

So how much more power can I expect to make? If i can get this engine to e/t the car to a high 11 on the motor I would be super happy.


With Kb 107's at zero deck, if your heads were 62cc that'll be 10.6:1 so I would back the cam up so it's straight up. That will pick up power in the upper end while the compression will pick it up in TQ everywhere.
Then zero lash the rockers and rev it to 6500 and that should be close to where you want to be.
Then work on the chassis...

Brian Hafliger