We've published a new eBook "American Performance V-8 Specs: 1963-1974" (ISBN 978-0-9864459-0-3) with ten pages devoted to Buick engine specifications, model applicability, and road test results. Models and engines covered include Riviera Gran Sport (425, 430, 455), Skylark Gran Sport, GS350, GS400, GS455, GSX, and Century Gran Sport (340, 350, 401, 400, 455).
It's available at Google Books and Amazon Kindle books.
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