besides the obvious. i have an older motor out of an 83, i believe, but cant remember which motor it was. i can see the stamping on my 94 that states its a 22r. i was considering building another motor and was gonna use the other block and head if it was a 22r, but cant tell. i looked today and could not find any stampings on the block. are there any other ways to tell what spare motor i got without pulling the head..externally examining.

 

Originally Posted by kyle_22r View Post
there's a little flat spot below the first freeze plug there that should say 20R or 22R or 18R or whatever you have. are the manifolds off the engine? 20Rs and early 22Rs('81-84) had round exhaust ports. 20R has round intake ports and the manifold has 4 individual runners, 22R has square intake ports and 2 main runners.