Aluminum heads

Dan s said
Ok. Now I understand. With a high lift cam the band could possibly be pushed up and out of the lifter cylinder. I need to be looking at lifters with out the oiling bands. Thanks for the explanation.

The word chamfer needs some explanation because that is part of the issue, and seems to be unique to the 340, not the other SBM blocks. Look at the block pix in post #94... you can see the chamfers at the tops of the bores. 340 only... no one seems to know why! The other SBM blocks is have the bores extending straight to the tops, no chamfer.

Be prepared to spend a lot of $$ for sleeving the lifter bores if you think of going that way.. like $500 + or -. That kind of $$ does not match up with thinking of using a cast crank to save $$, so you maybe should start looking at $$ for all of this. Roller cams and lifter are more costly by quite a bit, and when you get into the lift range and lift speed where they really are needed, the spring and rocker package is going to have to be right (not cheap). A solid flat lifter will achieve some pretty darned good lift rates and high lifts with less cost. Flat lifters just have the disadvantage of needing to watch the oils more and having to follow proper break-in etc.