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Old 05-24-17, 09:09AM   #95
Stubborn old goat
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Join Date: Mar 2008
Location: Pittsfield NH
Posts: 574

PS Just noticed an article in HR magazine that shows the clearest pics of some of the best 67-up heads and the differences between them. "Fire-in-the hole" is the article title and it is mostly about combustion chamber basics, not sure why pictures are of Pontiac heads mainly but they are ... was a good read for me. Did not see the late 455SD .. was looking for it. Not sure why small differences in RAIV chamber would add performance. Interesting tho.
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