These heads are 040 based with following improvements:

- New 37.5x33 Manley valves

- New HD seats and new GB guides

- 4-angle valve/seat job

- Ported and polished

- Flow bench tested

- New double HD springs

- New HD retainers

- New HD keepers

Up to 150HP with the right carb/cam/rocker and compression ratio!

Do you need more info?

info@Proformance-Belgium.com