Not trashing your thread by any means and this may not apply to your engine but... we just tore down (two) ATK crate engines (New) and never used. both were .60 over bore and had NA cranks (these were spec'd turbo with drain hole and 109 blocks). Like I said I'm not trying to trash your thread just providing information I have based on actual "tear down" experience. May be worth the cost of a set of head gaskets to avoid "disappointing" someone if the specs can't be derived from the ser#. GLWS