ok i have an excellent 049 and a 781 are they close enough in performance to use them both on the same engine? they were on a 454 we purchased . just wonderian if it would be ok to reassemble with the mismatched head numbers thanks graemlins/beers.gif

I took my 781's in to my machinist and he found one was cracked. He gave me an 049 to replace it. The only thing I found different was a little bump in the intake runner and in the chamber. The bump in the chamber was easily removed.