Hi,

I have checked #720´s head part number: 542350...

Quote Originally Posted by RoverRod View Post
Thank you Jim, the mystery deepens...

So, several of us have heads stamped 542350 (the NADA parts book states 542349 - one digit off), someone on the GNR forum said 512850 is the number on his multiple heads which he states have not come off the block, and now your cylinder head with two number's stamped on it; neither of which match any of the others. Very strange... Separately, can someone point me to where on the engine the 343xxxxx number should be? Thanks, Rod