Quote:
Originally Posted by Anteek29
Jerry: Thanks for that photo showing the intake raised edge...that's how mine looks. 
Alanwoodieman: Looked at my heads...they are both 81A. |
Actually nothing is "Raised". That area around the valve ports is "voided" or if you prefer "Lowered" with respect to the rest of the block casting and crank centerline. The block surface for the intake manifold and the crank centerline are the same distance on all the 221, 239 and 255 blocks.