Hydraulic Roller Lifters w/LA Block?

nub340 said

Cam lift: .541/.537

I stopped by the shop again today and we went over each lifter one-by-one: Only two lifters fit OK and the rest either have an obvious gap or are sketchy-close. The largest gap is the one in the photo I posted above and is a few thousandths of an inch.

This is essentially the same logic that my engine builder was using when explaining to me why grinding is prob going to be our best option. When you consider that the core of the camshaft is smaller in diameter than the lower cam lobe, then having the cam lobe shaved down a few thousandths of an inch won't have any real impact on the strength or support of the cam; especially since I won't be running super-crazy springs or anything.

Click to expand...

That is actually valve lift per the spec, not cam lift, and yes, is moderate. I can see why moderate springs will work out. I'd certainly consult with the cam mfr on the base circle, but it does not sounds like it has to be reduced too much. (And it is something I have not ever done so that is another reason to double-check!) I re-read Marco's comment on the lifter support needed with lifter to pushrod angle, and that is true, but all that angular lifter support comes from the lifter bores alone; the cam cannot contribute to that.

Did the existing lifters match up to the Hughes diagram dimensions? I would sure give them a call if they are different... but some money may have already been expended on lifters.