Description
| Block Height: | 10.195 |
| Bore – Actual: | 4.625 |
| Bore – Oversize: | .025 |
| Compression Height: | 1.120 |
| Compression Ratio – Actual: | 14.6 @ 77cc |
| Cylinder Head: | Big Chief 12 DEG/14 DEG |
| Displacement: | 638 |
| Dome Volume: | -7.3 |
| Piston Head Type: | Flat Top |
| Piston Pin Diameter: | 0.990 |
| Ring Set Recommended: | JG7708-4625-5 |
| Rod Length: | 6.700 |
| Stroke: | 4.750 |
| Weight – Nominal: | 583 |
