Quote:
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.
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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.