We are talking about 4 bolt motor ear mounts on truck blocks, and that those blocks do have thicker cylinder walls....I know 1st hand and have done one at 4.040
That’s the first I’ve ever heard about the thick walls being identified by the four motor mount bolt lugs. Do p-car 318s only have 3? My ‘74 318 has 4 mount lugs same as both my 340s - I thought all smallblocks had 4 lugs per side?
