Originally posted by 460_fan
the block casting numbers are above the starter and also on the right rear portion of the block, heads castings are under the valve covers, about half way back. atleast on mine anyways...

also I think there is a casting number on the block under the intake valley pan, but that would require pulling the intake to find it, the one near the starter will get you what you need, and should be easy to find if the engine is clean.
Tyhe numbers that the enthusiasts concern themselves with--and you should look for--are as follows:
  • Head casting numbers are on the outside of the cylinder heads, along the valve cover mounting rail and between the 3rd & 4th exhaust ports. Police should be D20E-AB. If not, let us know what you find.
  • Cylinder block casting is behind the starter and reads vertically.
  • Intake manifold casting number is next to (behind) the carb mouning pad and starts with D0OE-9425-(X).

Paul