7 1/4 rearend

the 7 1/4's poor rep. is exaggerated for daily use & occasional spirited driving on the street but would recommend upgrade if you ever go to track. Like grimreaper said spinning to traction kills these poor little guys. Made the mistake of getting aggressive at a test & tune instead of walking off of line in previous pass trying to get better time in my 65 valiant & that's all it took to get it to puke instantly and this was with sturdier 7 1/4 sure grip.