6 pistons by Vogel Manufacturing, brand new
Displacement- 637.94
Finished bore- 4.750
Stroke- 6.000
Rod Lenth- 11.000
Comp Height- 2.740
Compression- 122cc Dish
Pin diameter- 1.625
Top groove- .097
2nd Groove- .097
Oil Groove- .190
Piston weight- 1685g
Intake valve dia- 2.200 0.315 deep
Exhaust valve dia- 2.000 0.315 deep

Contact Dennis Folz 270-498-5339