That is a name I haven't seen mentioned is ages. The Thumper was a '35 or '36 CHEVY coupe gasser owned and raced in the late fifties and early sixties by Dan Allison of Charlotte. It was almost unbeatable in its class. It had a 283 Chevy engine that was actually 368 cubic inches according to a conversation I had with Dan after he quit racing it in about 1963. 368 cubic inches was huge for a small block Chevy engine 50 years ago. Some guy in Columbia S.C. provided the stroker crank and other parts for the engine build. Joe McCullough had the same guy build a 352 cubic inch 283 for his '57 Chevy Bel Air hardtop he drove on the street. It was another badass car on the streets of Charlotte in the early to mid sixties.