Technically the E7TE's are the truck heads. The E6's casting number was E6SE.
I certainly wouldn't want to put 1.7's on E7TE heads and then slap them onto an 86 engine. It's already pretty damn close to smashing valves with just E7's and stock rockers.
Personally, I'd ditch the 86 engine altogether in favor of an 87-88 SD engine. Better setup altogether. Better intake, T/B, pistons, and heads.
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