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02-05-2015, 06:01 PM
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Member
Join Date: Jun 2007
Posts: 478
Likes: 1
Liked 276 Times in 27 Posts
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Re: What year did stock stop using factory valve springs
1987 was the last year NHRA required the valve springs in Stock to meet factory specs. It was also the last year a camshaft in Stock had to meet duration and overlap specs.
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