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These are heavy duty 350 truck heads with big low compression chambers around 78 ccs and small valves and ports. Not suitable for things other than medium size trucks with a dump/delivery/tow package that do real hard work at low engine speeds. You'll see these listed for crate motors and OEM truck production from the mid 1980's to the latter 90's, all of these applications are correct, unsaid about the crate engine is that it's a heavy duty truck replacement engine. These are not Swirl Port nor Vortec heads, if anything their design harkens back to the 283 and 327 economy car or HD truck engines of that era with very low compression and a 1.72 inch intake valve.
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