[Stan Weiss]

Originally Posted by 65nss4spdGTO

I've had two short decks, the first was a 9.750" aluminum IA-II block, standard mains, oversize cam and lifter bores in the OEM location. I sold this block when I could get the iron block.

The second is the iron IA-II meausres 9.500" with standard mains. I'm being told it will go to 9.250", I've yet to get into this project and it sits in the corner.

I know of at least 1- KRE AL block that was made with smaller mains, standard height block.

If we use 500ci (AKA NHRA PS) as a target for CI, decks sub 9.500" can be of benefit, but also comes with other issues when looking at the block. It's not a purpose built block for a 500CFM cylinder head. Mains, lifter bore and cam location are not optimized.

IMO, the best approach for building a motor like Jason wants is to build the motor with a much higher HP target and just dont' RPM the motor as high. Someone wants to make 1000 HP @ 7000 RPM, how much power would that engine need to make at peak? We are bore size limited, that make us valve size limted, cubic inch limited and so on. BBC have the ability in block and head design to accomplish those goals, the approach in using a Pontiac has to change. More compression, more cylinder head, more cam, intake and so on. Running the engine 700-1000 RPM below peak will improve the life of the engine.

Can you run numbers on a 500ci engine making 1000HP @7000 RPM?

Calvin Hill
Hill Performance
708-250-7420

Calvin,
Didn't someone at one time sell a spacer kit to use a crank with a reduced main journal size?

Stan