There was something definitely not right with that particular 572. 460rwhp is pretty good for a healthy 468 but a 572 should be closer to 500. I've seen and done enough dynoing with my cars to know that the average correction factor for auto trans cars is 20-22percent. I'd get another trans & converter before I would ever tolerate a 35 percent loss. Most manual trans use a 15-20 percent correction. When GM tested the ZF six speed used in the ZR-1 Corvettes,they found an 18 percent loss. Allowing a 20 percent correction,which might be low for a power-hungry 4L80E,that 460rwhp equates to around 575hp at the flywheel. Clint Hooper H&H Custom,owner 1969 El Camino ProTourer 2001 H-D FLHR custom bagger http://dalesplace.com/misc/friends/clint/clint_hooper.htm ----- Original Message ----- From: "Dale" <[EMAIL PROTECTED]>
> In fairness, GM ads claim, "A new GM tall deck single plane intake manifold > and 850 CFM Demon carburetor deliver enough air and fuel to make the 620 > horsepower at 5,500 RPM and 650 ft. lbs. of torque at 4,500 RPM." Note it > doesn't say it "will" make 620 hp, just the intake & carb will deliver > enough air and fuel to "make" 620hp. Given 35% loss for automatic trans - > on average - through the drive train still leaves 400+ horsepower at the > rear wheels not taking into account the altitude of the test, if the car had > been driven much and was in a high state of tune, etc. 400+ rear wheel > horsepower is still pretty awesome for an over-the-counter crate engine. > > Dale McIntosh
