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

Well, if the stock ratio is what like 8.9:1 or 9:1? and thats with like anywhere from 58-62cc heads. So if he has 65cc milled .030, that puts him at around 63cc or so then the block too so that put it back down to around the stock ratio. Just a guess, I really don't know though.

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87 GT, 4 inch cowl hood,17x9 Cobra R's/255/45's,GT-40 heads,Crane 2031, Edelbrock intake, long tubes headers,h-pipe,Flows,BBK cold air, Mass air,70mm MAF, 1.7's, 1" spacer,underdrive pulleys,Pro 5.0, King Cobra, Adj. fuel Reg., Lakewood Lift Bars,50/50's,subframes, 4.10's.
Best time 12.759
Best MPH 106.79
Best 60' 1.695

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