| Compression
Ratio computed with .010 deck and .038 head gasket at bore +.125"
(weights and compression ratios are approximate) |
| |
|
Compression
Ratio |
|
|
|
| Bore |
Weight |
68cc |
72cc |
76cc |
Part # |
Ring Set |
|
|
390FE - 3.980 Stroke - 6.490
Rod - 1.665 C/H - .975 x 2.750 - 136 Gram Pin |
| 4.080 |
TBA |
11.30 |
10.82 |
10.39 |
14472-030 |
315-0043 |
Ring Grooves 1/16 1/16 3/16 |
| |
|
|
|
|
|
|
Valve Relief Volume 4.0cc |
|
428FE - 3.980 Stroke - 6.490
Rod - 1.665 C/H - .975 x 2.750 - 136 Gram Pin |
| 4.130 |
555 |
11.52 |
11.04 |
10.60 |
14471-020 |
315-0032 |
Ring Grooves 1/16 1/16 3/16 |
| 4.150 |
565 |
11.61 |
11.12 |
10.68 |
14471-030 |
|
Valve Relief Volume 4.0cc |
| 4.160 |
571 |
11.65 |
11.16 |
10.72 |
14471-040 |
|
|
| 4.170 |
576 |
11.70 |
11.21 |
10.76 |
14471-060 |
|
|
| 4.190 |
585 |
11.79 |
1.29 |
10.84 |
14471-090 |
|
|
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PROBE FORGED PISTONS |
