I have found the threads on compression very interesting and decided to do the calculations for my 312. What I have is...



312 bored to 3.830

3.44 stroke

6.252 rod length

.016 deck height

G heads milled .020 so estimate 67cc

Best head gaskets .043

Mummerts y-265S cam I plan to run 2 degrees advanced so valve closing @ 60.5 ABDC

1.54 rockers



I come up with a static comp of 9.238 and a dynamic of 7.583 . Is my math correct on this? Operation is @ 4000' and above, is this a premium only engine or is mid grade adequate?



Thanks Mike

1956 Fairlane Victoria (ORREO)

 

Overlooking Beautiful Rimrock AZ