I briefly bracket raced a 75 Buick Skyhavk V6 20+ years ago hoping to run it in IHRA T/pure stock/automatic. The 75 and 77 engines are very different, 77 and earlier=oddfire,77 up =evenfire. The cranks, cam, timing sets, distributors and heads are different. Check the NHRA blueprint pages for specifics. to tell the difference look inside the dist. caps. The evenfire will have the "electrodes" evenly spaced at 60 degrees. the oddfire will have two "electrodes" offset 90 degrees. There were several NHRA V6 record holders in the 80's so I thought it would be a good combo to start out with. The engine had been horsepowered from 110 to 150 and in "legal purestock trim (stock cam), mine was a turd. It would turn 5000 but shift past 4500 and it fell on its face. Now I understand horsepower to weight classifications better LOL. The 75 used a 2GC rochester that was not as big as the "largest" GM 2bbl. not sure about the 77 carb. The rocker shaft assembly on the 75 is unique to the 75 and 76 only, has fragile, aluminum rocker pedistals that have to be scavenged from a junk yard (good luck) or machined. The 77 has them cast in the heads. S-10 pickups are a good source for posi units. Kenne Bell Buick was THE source for cams, ring gear spacers, oil pump kits, headers, anything Buick V6. I hope this info is correct and helps. Don Jackson
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