Stab it in a big ol' heavy truck or 4x4, and even with tame gears it'll have enough grunt to move masses of sheetmetal and big tires. That's more than GM claims, with peaks 100 rpm lower than advertised.

With the timing set to 34 degrees (36 degrees produced the same power), the jets at 70/76, and an electric water pump in place, the HT383 overdelivered on the dyno, spitting out 338 hp at 4,400 rpm and 444 lb-ft at 3,400 rpm. I want to replace the camshaft position sensors and magnets. I have a TH350, Edelbrock Performer EPS intake, Edelbrock 1406, 4.10 gears and 31' tires. 050 cam in this engine is not very well matched to my driving needs. I have a GMC 3/4 ton 4WD truck with the GMPP 350/290hp. We were surprised to discover that the HT383 comes with both a partial windage tray and a full pan baffle, so in back-to-back tests, the Milodon unit didn't help us out this time. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Recommend SBC Cam for torque & fuel mileage. We also opted to upgrade the stock oil pan with a Milodon claimer pan that has an integral windage tray, because we've found them to add a few horsepower. You'll need to provide a carb, ignition, and headers, which we did with components from Demon, PerTronix, and Hedman. Your new HT383 will come out of the box complete with valve covers, a timing cover, an oil pan, an iron water pump, an 8-inch harmonic balancer, an auto-trans flexplate, and a dipstick.