When I went to the site, the largest GM head the discussed was 292cc's. Thanks for the info guys. Blown, is this close enough....?? These are not the exact heads I am running. Anyone wanna trade for some AFR's????

Thanks, A4

Check the eddelbrock site

Unless someone gives you those heads I wouldn't use them. A good aftermarket head will flow 400cfm intake 300 cfm exhaust @ .700 with the lower numbers equally as impressive. These are ported numbers but the heads you are talking about will not come close ported.