milling stock heads

[SpinMonster]

what is the most you can mill the heads with 1.7 ratio rockers without piston/valve hits or head warping?

 

[Fast Freddy]

i know on gen 1 and gen 2 vipers u can bump the compression from the stock 9.6:1 to 10.25:1 via head milling no problem even with 1.7 ratio rockers. i believe this requires .060 to be shaved from the head as i recall.

 

[SpinMonster]

Any idea what the stock set-up gives you as far as clearance?

 

[RedGTS]

Stock pistons are .035 down in the hole. Combined with a stock .055 gasket, stock piston to head clearance is .090 (at least on the newer cars; I have no idea if it changed over time).

 

[opnwide]

.035" down? add this to your .040-.050" gasket and you've got a real problem with your squish! I know its easier to mill your heads, but if you ever pull the engine, consider decking the block .030". You'll eliminate this empty "pocket" in the squish area, raise the compression as much as shaving those heads, and you'll make more power.
I suppose this is typical production tolerances, but can be improved greatly.

Lots of good books on this subject.

 

[SpinMonster]

I called cometic gasket and they said the multi-layer steel gaskets are as much as a year away. They will be in varying thicknesses to reduce the quench as much as .030 and at 200 per set that is a lot cheaper than shaving your block