...........All 3 of my race only cars used 18 in collector extentions, bob is right 1-1 2/2 tenth is about right..........infact in 1 case we had to take them back off to keep the car in the 11.000 bracket............kim.......
we tried them on the hemi, back in the day, didn`t do a dam thing, took them off and threw them in the trash. they usually help cars that need more low end, the hemi didn`t, always had trouble hooking it up. would go 10.40`s on those old tires back then, when hooked. be interesting to see it w/ currant upgrades-tires,convertor, cam and ect. but that probably ain`t
gonna happen,my ex partner is a little older than me, has a bad back , and is sittin on it.:sad9: