These heads are stock based with following improvements:

- New 33x30 valves

- 3-angle valve/seat job

- Ported and polished

- Flow bench tested

- New STD springs

- New STD retainers

- New STD keepers

Up to 85HP with the right carb/cam/rocker and compression ratio!

Do you need more info?

info@Proformance-Belgium.com