The Stovebolt Site Forums The Shop Area Engine Shop Engine suffix code

The 1968 & 1969 Z/28 302 will have a suffix code of DZ (one of Chevrolet's most recognized suffix codes, belonging the the large journal high winding 302), both the 68 & 69 327 will be large journal. Since the HV suffix code matches 350 and the casting code resembles a match to the 350 (250 hp), you probably have 350. Don't know if it's 2 or 4 bolt main, but IMHO, the 2 bolt main engine is preferred for building a performance engine, as it is much easier to drill the 2 bolt main block for use with nodular iron 4 bolt main splayed main caps (GM part number 14011072) and the block webbing of the 2 bolt main block are beefier than its 4 bolt main counterpart.