TD vs NA heads - how do I tell the difference? - page 2 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.
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#15 by rabbitman on 23 Nov, 2009 23:08
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I was always told that all VW reman heads were TD spec. Initially, the NA and TD heads were different- either casting, valves, or both, but all factory reman heads are supposedly the same.
I don't know that for sure, just going on what I've read.
Brendan
I read that the TD heads and exhaust valves were a slightly different metal than the NA's so I don't see how they could change the heads metal without completely melting it down and starting over