My cold and dry compression is between 185 and 215 on all 8 cylinders.
It is a 1970 455, #48 heads, and a '65 intake. Unknown bore, stroke, and cam, specs with timing at 12 initial and 32 total.
I need to run 91 octane with a 16 oz. bottle of boostane. Even with this, I may have issues on hot days. Without the boostane, the engine diesels when turned off.
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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
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