These heads are stock based with following improvements:

- New 35.5x33 Manley valves

- New HD seats and GB guides

- 4-angle valve/seat job
- Ported and polished

- Flow bench tested

- New HD springs
- New Alu retainers
- New GB keepers

Up to 120HP with the right carb/cam/rocker and compression ratio!

Do you need more info?

info@Proformance-Belgium.com