[BruceWilkie]

Originally Posted by J.C.you

Bruce, the port is close to 4.6 csa now with no mods to the lifter bore other than the liners. For a small cube motor such as the 445 I mentioned to achieve the target rpm of 10k before choke we would only need a port with approx. 4 csa. Definitely a smaller/narrower port and less, if any angle needed after moving the lifter bores and camshaft lobes. I believe there is enough meat in the existing IA block to get there.

IMO it would be best to only have one arc of travel to the pushrod vs the radial arc that occurs with a fore or aft offset...

This lifter movin and such would best be accomplished with a casting revision that allowed choices in lifter bore location and angles.
Orderable un-drilled, custom drilled or standard drilled.

Custom cam cores are pricey enough let alone if you end up with a lifter position that would require welding new boss locations. A revision to the casting is a one time change and it would still be usable for standard lifter locations.