ok Maybe you guys know....
 

i just got my motor running and i was wounder ing the comp ratio... 65cc heads milled down .030 and the block was decked too dunno how much probably the normal... well the stock ration is 9:1 what would mine be allot of guys around here say around 10.5 -11:1 the builder say only 9:1 i think hes on crack!!!!
help....
thanks!!!

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ALL NEW PPG Torch Red 95GT, 304ci block, Forged pistons, Ported Explorer Intake, E-303 cam, fully ported and polished and milled E-7 heads, 75mm MAS, BBK Adj. fuel Reg & gauge, BBK Shorty Headers, BBK H-pipe, March Pulleys, 2 Chamber Flowmasters, Kenny Brown 6 point Roll cage, Kenny Brown Panhard Bar, Powerslot Rotors, PBR twin piston calipers, Eibach Sportline Springs, 180* Thermostat, 1/2 Plenum Spacer, MSD 6AL, MSD Master Blaster, MSD 8.8 Wires, 24# Racing Injectors, AFS 10.5" Cobra R's, Nit

9.8

I say 9.5-9.6....I just don't see milling your stock heads adding that much compression. But Sky may be right.

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Dustin
Saleenized 89 GT,428 rwhp,TFS Street Heat Intake,TFS TW Heads,TFS #2 cam,BD-11A 9 psi,FRPP 1.6 rr's,BBK 70mm TB,Pro-M 75mm Bullet,MSD 6BTM, FMS 9mm wires,BBK longtubes,BBK Short H-pipe,American Thunder cat back,3.55's

12.3@119

Mines just a guess. I would have said 9.5 or so, but he said the block was decked too.

So I went with a 9.8.

Althought your builder says 9:1. Maybe on the port job they enlarged the combustion chambers, and milled that to compromise?

Sky

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-1989 Saleen Mustang #406- TFS Heads, E-303, edelbrock intake,70MM TB, 73mm MAF, off road H, headers and 3chamber flows.
12.55@107mph
50-175 Nitrous Works WET Kit just added.

Moved to Windsor Power

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SVO siamesed 351 stroked to 417ci,Yates heads, solid roller,Trans King glide and a little blue bottle
of giggle gas. My Car