This one would be a newer set of 4.840 b1-TS heads. Oval ports, direct port alchy injection. This block was sent to LSM to have the lifters holes spread out and then custom 60mm Cam cores were made to line up with the block. we uses .937 lifters, Since things were moved over we could put proper sized pushrods. Also T&D rockers with helped even more with the alignment.

This was a very reliable set up we ran for 3 years. Another pulling family has it now and she is still running strong.

Run
https://www.youtube.com/watch?v=mqr1yF8Upbc