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 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Herb Lumpp Sent: Saturday, June 25, 2005 9:49 AM To: Chevelle List Subject: [Chevelle-list] GMPP 572 For anyone that is/was considering buying a GMPP 572, you may want to think about it a little more. While on the Power Tour I had the chance to witness and video tape the Mother's 67 El Camino on a chassis dyno. Before the El spun the dyno, there was a TV crew taping a segment for what I assume was Hot Rod TV. They kept interviewing the owner and redoing the takes to get it just right. In the end, the 572 could only muster up 460 hp to the wheels on the first attempt and then a dismal 406 hp on the second attempt. Not only did the 572 disappoint everyone watching, the GM rep that happened to be there was fumbling for excuses! I would hope with more in car tuning, the hp number will increase. Herb Lumpp http://users.adelphia.net/~hlump/index.htm
