Quote:
Originally Posted by Sun Tuned
Nowhere did I see exactly what cylinder head being used.
So as some have said, need a bunch more info.
So yeah, that alone by itself makes or could make a runner or some melted ring lands…
Smart money is start conservative ,say 30 if your using modern combustion chamber heads for instance and proceed carefully.
If using stock type iron heads , numbers will be different.
Then the rest of the stuff figures in. Compression, gearing, car weight, fuel type used etc.
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Sun tuned, I have the info posted in my signature.
Running 670’s on it now.
9.3 to 1 compression
3.73’s
1966 GTO
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1966 GTO
1966 421-9.3-1 comp-Race Tec 23cc Pistons
1966 Tri-Power
1967 670 Heads
Pontiac "Highlift" TriPower Cam by SpeedPro
DUR 214 Int 224 Exh @.050 - 107 ICL
LIFT .445" Int .465" Exh
Tri-Y-Headers by Tribal Tubes w/ Goerlich Mufflers
1966 Muncie Wide Ratio 4-Speed
1968-72 Chevy 12 Bolt Rear End w/ 3.73 rear gears
Last edited by SD421; 08-09-2022 at 12:44 AM.
Reason: Add info
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