|Originally posted by Raydar:|
Sure about that?
I was under the impression that they switched to aluminum heads before that.
In any event, the easiest way to tell is to look at the exhaust manifolds and spark plugs.
The iron head engines have two spark plugs between two of the exhaust ports.
The aluminum head engines have exhaust ports and spark plugs laid out in order.
Does that make sense?
No, because that is not correct, the "order of spark plugs and exhaust ports is the same between iron heads and aluminium heads.
Also, yes I am VERY sure about the Lumina APV have iron heads, it was the only '90s transverse vehicle to use an iron head 660. The minivans were upgraded to aluminum heads in '96 with the introduction of the 3400 in the Montana.
The Raven :Under Construction
"James" 1985 GMC Jimmy, 3.2L turbocharged intercooled hybrid 13.873 @ 99.08
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