That's interesting, I've never seen them but always assumed the heads were the same, so that they could save money using just one casting for both heads. Are the differences something that was machined differently on the same casting? Otherwise I'm struggling to understand why they would design an engine with one timing chain on the front of the engine and the other at the back.
Quote:
Originally Posted by jsceash
I have a almost complete 2003 motor in my garage on a engine stand. The heads are different. 123 head chain tensioner is on the bottom the 456 head its on the top. The AOS connection on 123 is different than the 456 head crank exhaust port. I have a complete set of 2004 heads off a 3.2 they look almost the same and also could not be switched for the same reasons.
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