Quote Originally Posted by Rgtrough
Hey Dave, just finished my 383 build. Most everything matches your specs. 1 5/8 headers 3" collectors 481 torque @ 4300 479 hp @ 5800. 1 7/8 headers
4" collectors 490 torque @ 4400 503 hp @ 5900
Did you do the cam with the 4-7 cylinder swap????

That's some very encouraging torque numbers!!! What do you have the engine in? Should be a good runner!