What year did stock stop using factory valve springs

Bernhard · 02-04-2015, 02:05 PM

What was the last year that NHRA stock class used factory valve spring pressures?

Travis Miller · 02-05-2015, 06:01 PM

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.

02-04-2015, 02:05 PM	#1
Bernhard Junior Member Join Date: Jan 2012 Posts: 30 Likes: 0 Liked 1 Time in 1 Post	What year did stock stop using factory valve springs What was the last year that NHRA stock class used factory valve spring pressures?

02-05-2015, 06:01 PM	#2
Travis Miller Member Join Date: Jun 2007 Posts: 478 Likes: 1 Liked 276 Times in 27 Posts	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.