Quote:
Originally Posted by big gear head
Those exhaust ports have been welded and reshaped. The 077 heads had the D ports, 074 had round ports. Looks like they have had a lot of work.
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That is not correct. The very late 074 heads had the d port exhaust port and vain like the 077 heads. I have had several sets. Here is a link with a nos set I sold on here.
https://www.yenko.net/forum/showthread.php?t=169700