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west coast · 01-03-2009, 12:18 AM

I know coil over are not legal but just using the spring in the stock location with an adjustable spring perch for the assortment of spring weights. I have seen the adjustable ones on the lower control arms but was thinking more on the lines of circle track style with the top of the spring being adjustable which could be made to bolt on. In the rule book it says rear control arms maybe replaced with NHRA accepted OEM type after market units. So I would assume that the spring perches would not be on their list and I would assume there is not a list and would have to call NHRA with a manufacture and part# and they would get back to me in their speedy way.

01-03-2009, 12:18 AM	#6
west coast Senior Member Join Date: Dec 2008 Location: Rainy Washington Posts: 608 Likes: 12 Liked 222 Times in 72 Posts	Re: Adjustable spring perches I know coil over are not legal but just using the spring in the stock location with an adjustable spring perch for the assortment of spring weights. I have seen the adjustable ones on the lower control arms but was thinking more on the lines of circle track style with the top of the spring being adjustable which could be made to bolt on. In the rule book it says rear control arms maybe replaced with NHRA accepted OEM type after market units. So I would assume that the spring perches would not be on their list and I would assume there is not a list and would have to call NHRA with a manufacture and part# and they would get back to me in their speedy way.