The timeline of that test and a new rocker would fit. I wonder if the new higher ratio was a result of the valve bounce tests results with the 891 camshaft. So if the 1.57 ratio is a reality (and I don't really doubt that it is) then less than 10% of Corvairs had them. Will someone check the specs in the 67-8 and 69 supplements to see what they list?Īnother thing to consider is the 66-69 cars only account for approximately 150k cars of the 1.8 million total production. Of course the manuals have errors in them, so they're not gospel. The fact still remains that the supplement says it's still 1.5 to one. Is there a new part number for this rocker? Maybe some other GM insider records? I have seen pictures of "LM" rockers that appear to be shaped differently than earlier ones. Maybe Bob will weigh in on where this increased ratio rocker information came from. All lifts are measured in inches at the valves." 1965 and earlier used the 1.5 rocker ratio. "Lifts so noted and all specs for the 1966 and later, use a rocker arm ratio of 1.57 to 1. ![]() In his camshaft spec chart there's a footnote to the lift figures: ![]() There's an article in the CORSA Tech Guide titled "Camshaft Usage" by Bob Helt.
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