421ci sb2 dart alumn block, 4340 eagle crank, eagle 4340 h beam rods w l19 bolts. Solid roller comp cams custom cam and lifters. Sb2.2 heads flow 400cfm on intake side with del west tit valves. T and d shaft rockers. Msd dist. Motor dynoed at 850hp. Ran 9.30 in a 3250lb 68 camaro. Only 10 runs on engine.