331 Dyno results

[302 LX Eric]

The 10:1 was achieved through milling of the heads. The heads now yield 58 cc combustion chambers and coupled with the following specs produces 10.02:1 compression.

4.030 Bore
3.250 Stroke
5.315 Rod Length
4.100 Gasket Bore Diameter
0.041 Gasket Thickness
1.250 Compression Height
8.206 Deck Height
4.025 Piston Diameter at Top Ring Land
0.175 Distance from Top of Piston to Ring Land
5.000 Total Valve Relief Volume (cc)
58.00 Combustion Chamber Volume (cc)

I took these amounts and plugged them into Jeff Chambers' website where he has a compression calculator and I got 10.02:1. I also did this calculation on another automotive website and got the same thing.

Plus, the pistons are Probe Sportsman Race Series Pistons with HUGE valve reliefs so I can run lots of life and duration without clearance issues. total lift with my 1.72 rr is .550 and I'm using Anderson's high rev valve springs.

E