Originally Posted by FAT622
When do you have to use bronze lifter bores? i have a merlin 111 10.2 deck BBC with dart big m heads. the cam has 833 thou lift and 900lb open
We CNC machine alot of blocks and rarely install bronze bushings only when bushings back to std. to ge the lifter bores in the correct locations as most guys go with either .875 or .904 to correct lifter bore alignment ans going wit the bigger lifter like the .904 lifter give you more surface area and less wear if any.
We have 2 SBC with 871's on them and aluminum blocks with .904 lifters and no bushings and we run 1250 over the nose and 460at the seat and no wear issues using the aluminum lifter bores.