Originally Posted by RAMM
Originally Posted by Dragula
Sounds like the valve springs are shot.....When ever the power falls off a cliff like that, its always been valve springs.


Normally I would agree but this was different. I put the air hat on to see if CFM fell off at higher RPM's it didn't. I have also never seen valvesprings go away and then come back 500rpm later and hold on a further 1000rpm. J.Rob



Harmonic spring distortion at that particular RPM? (probably not the exact technical term I'm grasping for)

Kevin