SBM Main Cap Material

Member Rocket had a couple sets for very reasonable price. I hemmed and hawed too long and they are gone now and I'm not sure there will be any more. Making the main caps is not rocket science, the shape is simple to do in the mill and there are only a couple dimensions that need to be very accurate. They can be bored in pairs in the lathe or stacked up in the mill vise. Haven't found a set of orphaned 340 caps yet for reasonable money. No matter what I put on, they will require a line bore and hone and to make it a viable proposition I need to keep the price of the caps down or it makes more sense to get another block. Any of the other aftermarket caps would put me out of range of sensible budget. I can get a hunk of 4140 for about $75 or less and my time is free to me.


I understand how to make a main cap. The question is is it worth it. My answer: nope.

I’m stunned how many blocks don’t have caps. Who looses caps?

At any rate, unless it’s a numbers matching 340 block or a race block making caps isn’t worth it to me.