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11-20-2008, 04:52 PM
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#18 |
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Banned
Join Date: Dec 2007
Location: Lake Placid, Florida
Posts: 3,203
Likes: 1,047
Liked 235 Times in 110 Posts
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Re: Stocker Head Rule Change????
The change from stock to super stock was in 1972......The bogus head and intake stuff really didnt take off until the stock rule was changed in 1985 to allow any duration, overlap, and valve spring pressure. Without those changes the acid etching and porting being done then was not as effective.
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