Quote:

Kirk @Bullet
recommends their CRB304/312-H8
247/255@050 530/551 lift
this is around what i thought i may need.
probly still use the current springs if still ok and won't have as much worry re clearances.
as to going solid?with the rev range i use,traps at 6-6100RPM i don't know if there is a benefit to be had.
this is a just a future proofing plan at this stage.
Tex



I respect what the guys at bullet recommended, but I would say that the your existing 509 cam is not a particularly fast rate of lift cam, and is easy on springs.
The Bullet hydraulic cam you are considering will have a much faster rate of lift and will be more likely to send your valvetrain into unstable behavior at a much lower RPM threshold.
Stiffer and stiffer valvesprings usually just compound the hydraulic lifter troubles.

Not trying to beat this topic into the ground, but in the spirit of "future proofing," (and if it were me,) I would go to a solid flat tappet now and eliminate the potential for valve instability and float headaches later.

The engine will be apart and you will be purchasing a new cam and lifters anyway...