Well that is interesting Because everything is pointing to it being a '91 318 TBI roller cam engine with the factory 302 closed chambered heads and factory mopar rocker rails.
If this is true, then it is a flat topped piston with factory 9.2:1 cr and full floating connecting rods.
Just like this '91 318 TBI roller engine that I converted to Edelbrock 4bbl carb.
Factory pistons .040 ths in the hole, no valve reliefs.
View attachment 1715930015
Let's have a look at your Closed Chamber heads.
View attachment 1715930017
'91 318, ^^^ roller engine, factory 302 heads.
Engine came out of a '91 W150 Dodge Pickup.
Worth hanging onto.
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