I have a 454HO that I'm looking to replace the cam for one w/more lift - like in the .600 range. I heard that factory lifters can't go more than .575. But some guys say they are using the oe lifters w/.600 cams.

Any input is appreciated - thanks!
Vince

Depends on the base circle diameter of the cam shaft your using. Most small crane cams work fine with factory lifters up to .610 lift.

I ran factory OEM roller lifters in my Gen 6 engine with a Crane 587 / 612 cam. I later swapped that cam for a custom roller 629 / 629. These same lifters have over 300 hours on them.

I have to admit, this for a 69 chevlle
I'm upgrading heads to the GMPP alum rovals w/2.25/1.88, so I'd like to get some lift.

Seems to be alot more experience w/the Gen 6 motors over hear.

I'm thinking either the:

Comp XM 284 230/236 112 .547/.547
Crane 168731 226/236 .587/.610
Voodoo 231/239 .6/.6

I like the XM284, but I think I'd be doing myself a disservice w/the low lift. Guys here seem to like the Crane. I wanna use the OE lifters b/c there almost new, and these motors already suffer from heavy valvetrains, and the Crane lifters are even heavier than the OE lifter. And for some reason I just trust OE stuff. Not to mention $400.00+.

There seems to be debate on the lifters. Either they:

Fall below the dog bone,
push the dogbone up,
oil holes dont line up.

Here's a pic of the oil hole height between the oe and crane lifters:

here's how low the lifters fall into the block with a .600 voodoo:

I have a 230@ 50 & 600 thou with a custom grinde Com cam and stock 230 hour roller lifters. Runs strong but some bottem end torque has gone away and after a real good tuning session not much better top speed. Next time i would run 550 and 225 @ 50 and have the bottem back a little. Jas

Jas, how was the lifter engagement w/the oe lifters?