The Track Boss 351C block that is approved for NHRA Stock/SS is 9.2 deck 2.75 mains, splayed caps and 1 piece rear seal , Siamese bores and updated priority main oiling
They also will be available with optional 302 mains, all bulkheads on all blocks are solid (XE design) all blocks have a provision (material added) for a left hand GM starter (drivers side) all blocks have enough material to bore the cam tunnel to 60mm and, as of now the patterns will be updated for offset or non standard lifter bore locations.
Non standard deck heights will be added at a later date.
