zlx engine ??
just bought a short block assy trying to decode-block is 3999289/1972/4-bolt main tapped for oil cooler/high perf pass--crank is 3967811/7115--dimple rods--3947886 pop up pistons--cam has 4094 & 1142 on back which i cannot identify. i have found doing my research some info on a zlx replacement engine that was built around the date on the block. i know its a 454 block by the number-but all info says 2-bolt for this number. any ideas what i have or info on zlx engine such as cast no. for a zlx block??? thanks, mike