diff between drivers and passenger heads

[89mulletbird]

I got a new set of TTA heads from Champion, how do I tell the drivers from the passengers head? They are the 515 casting heads, one has a 27 on the underside and the other has a 15 on the underside.

 

[WarWagon]

Shouldn't matter the Buick's heads are ambidextrous they can be used on either bank. Therefore it was cheaper to produce too they didn't not have to cast a left and right.

 

[joe_schindler]

The odd numbers on heads and blocks are usually mold or molder numbers; just a way to keep up with the quality control. They are interchangeable parts. In theory; they are the same part. In reality; they may fit better one way than the other.