I went from running 10.80's in my car to 10.20's... 1.52 sixty's to consistent 1.42's...by  changing the rear leafs and bars to your product. Thanks for a great product! Easy to install and fitment was perfect! By the way we race at 4200 feet and the corrected air is RARLEY below 6000ft. My home track is in Acton Mt just outside Billings MT. I'm running a 380 inch Iron head cleveland, Jerico 4 spd. 9 wide slick..... 
Thanks again!
Bruce Weiss
Div 6 NHRA
Pro class

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