Quote:
Originally Posted by chiphead
That roller looks like a real possibility for this application. What comp lobes does it use? Looks like a decent amount of seat timing, slower than a XE lobe?
What springs and retainers would be needed? Would this set up at 1.6" or would you need longer valves? When I set up the Voodoo HR on my 670s, I had to go to 1.8" to find a spring that would set up at the correct pressures with enough lift.
|
That cam does not have profiles list anywhere that I know of. It definetly has less acceleration than a XR Comp hydrualic roller profile. It would be difficult to compare it to a XE flat tappet. But if the install height was set in a stockish range of 1.6 to 1.63 the Bulter cam would work with the same 995 spring and 940 retainer combination comp uses on most of the XE flat tappets cams. It is a very easy spring package to put together.
For what was described I would prefer to use a Bullet or Howard’s HR cam that allows for the use of a stock distributer gear. They are all 4/7 swaps. Those lower lifts work well for the 2148 LS/LT drop in style dog bone lifters too.
I am not sure where the compression would end up on a 67 engine with heads mentioned. Seems like those had an odd piston with smaller valve reliefs like an 389 and have different cylinder scallops. But I would assume a 62 head with a valve job and surfaced would be at least 75 cc to 77cc.