[slowbird]

Originally Posted by mgarblik

We are going back nearly 10 years here, but I think that set-up actually produced in metal was for an Oldsmobile V-8. If my memory serves Mr. Anderson was working with Cody, (last name?) at Joe Mondello Racing Engines and they had cut that unit out for Oldsmobile installation. I do remember him posting somewhere a similar unit for a Pontiac in a CAD format of some type. But not sure if one was ever made. Steve Barcak and a couple other guys have made multi-piece reinforcement girdles for Pontiac blocks. As an engine machinist, I like the multi-piece design from a service standpoint. Having a one-piece girdle/main cap bridge is a complete nightmare when it comes time to line bore/hone the mains. Conventional engine machining equipment can't handle a piece like this. Now your into CNC machining for routine service. A deep skirted block with 7/16" or 1/2" cross bolts and individual caps would be the best for strength and service. For big HP, a stock design Pontiac block just doesn't have the material in the right places to create the best possible lower end. If you use 9/16" fasteners in the center bolt holes, there is very little material left to hold them. The outer splayed holes as well if large fasteners are used, very little material to hold them. A much smaller main bearing would help by allowing more material around them to hold the caps. The original 180 HP design from 1955 has it's limits. The 3000 HP a few are making out there is probably close.

How small of a main you wanting? Curious what will live at these high loads?