Posts: 3079 From: middle of NC Registered: Oct 2000
posted 10-19-2002 11:34 PM
If you are talking about cleveland heads, in the upper corner next to the valvecover, there will be a raised number, either a 2 or a 4. That is how you tell. If there is no number, either someone ground it off, or they are newer 351m-400 castings and pretty much worthless.