Had a friend that ran a 40 Willys coupe back in the 60's, he made two back bumpers for it..one was concrete filled 3" well casing and the other was concrete filled 6" well casing. I remember we had to use a floor jack to raise either one up to bolt it to the frame.. 3" pipe for C/G and the 6" pipe for D/G. Bill
I believe 3" schedule 40 is the answer. Roughly 3.5" and 30 pounds for 4 feet with caps. Sched 40 is 13/64 thick so this will hold up to a push at the track. Can be had for a ~$100.
The Jalopy Journal
