Tech Contributor Gold
Join Date: Dec 2004
Location: Amish Wonderland Of Central PA
Re: 427w Stroker... cam question
As you probably know, the retro cam has a smaller base circle than factory stock and thus the lifters would ride lower in the block. The potential problem is the raised lifter bore height of the 94' roller type block. The issue is that the link bars may not clear the top of the lifter bores. This easy to check.
Put 1 pair of link bar lifters in the block and rotate the crank. (Normally the links face toward the center of the block, but on a 351w it can face the heads if desired.) See if the links bottom out or rubs somewhere. Note how much clearance you have . If it is .050" or more, you are golden. Then move on to another cylinder and check again.
Alternately, so as not to scrap the sides of the lifters in the bores, you could put the cam to the high part of a lobe and carefully try to measure from the crown of the lobe to the top of the block's lifter bore. Then compare that measurement to the new lifters with the bars installed on the work bench. You can only do one lifter bore at a time before rotating the cam to another lifter bore. It won't quite be the same as the links rotating on the lifter, but it might give you some idea ahead of time before actually throwing a pair in the block.
If you can't get the clearance needed, then I believe your only recourse is to replace the cam. The factory individual lifters will ride too short in the block to use the spider and I am unaware of any tall riding ford link bars or individual Ford type lifters that will compensate for the reduced base cam (and of course they get expensive to try.)
There is another possible problem with the 427w in that there could be interference between the rotating rods/pistons and a normal base diameter cam. I've not built a stock block 427w to know for sure and maybe that is only a Chevy problem. I am sure someone will speak up about that.
65' Stang Street/Strip. Dart 434W NA, Victor heads, G101A 4 Spd, 4:56 rear gear, on 93 octane pushing 3550lbs. [email protected]
Last edited by dennis111; 02-06-2014 at 05:12 AM.