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X-TECH MAN · 11-20-2008, 04:52 PM

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.

11-20-2008, 04:52 PM	#6
X-TECH MAN Banned Join Date: Dec 2007 Location: Lake Placid, Florida Posts: 3,203 Likes: 1,047 Liked 235 Times in 110 Posts	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.