ooooh, i don't know about that. the 231 / 252 v6 is based on the 300ci v8 ( which is where the valve order and deck height come from ). and the 300ci is the 2nd iteration of the Small Block Buick family.
the 231 is concurrent with the Buick 350ci ( which is where the 231ci gets its bore size, older v6s used the 300 bore and were 225ci or 3/4*300 ).
the problem being, that the general consensus is that the Buick 350 heads are pretty much all the same from 1968 to 1981, excepting that the later years might have some emissions ports. my suspicion is that the same thing is going to apply to the OEM v6 parts.
if you can prove us wrong in that assumption, we'd love to hear about it.
having said that, the Buick v6 was the major six cylinder offering from GM when the NASCAR boys and upper level short track people trying to transition to v6 power plants. we've got a couple of magazine articles in the Reference section about this.
scour RacingJunk.com / other vintage power web sites and you can probably come up with old Buick race parts that were used in circle from the 1980s and 90s.
https://www.teambuick.com/reference/...aker_buick.php
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H.H. Goddard, Human Efficiency (1920)
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