This site is dedicated to the restoration and preservation of 1960's and '70's Musclecars. I will answer any and all questions about what is original, and what are "Period Correct" modifications. I will also post my personal opinion about what is and is not proper. People are encouraged to debate me or share their own opinions or experiences.
Sunday, May 24, 2015
Ask for professional advice....And then don't take it...stick to your fantasy....
Had a guy mention an old Hot Rod article about a couple guys that ran a 440 powered '68 Charger in the Silver State classic and went like 185 mph. ( They were shooting for 200 mph ). He asked if I thought they could break 200 if they'd had a Hemi. I said no-the 440 they had was putting out like 600 hp-they didn't need more power-they needed a lighter and more aerodynamic car than a heavy, boxy '68 Charger. He asked what combination I would run if I wanted to try to go 200 in the Silver State classic or at Bonneville. I said I would use a 1982-90 Pontiac Trans-Am with a 454 Chevy for power as this would be the easiest and most econmical way to do it. Then he asks why not a '70's T/A with a 455 Pontiac. Here's why-# 1. Aerodynamics is just as much a factor in high-speed runs as power. A more aerodynamic car can go faster with less power because it slices through the wind easier. Why do you think a '79 Trans-Am can go 132 mph while a 454 powered GMC Stepside '78 1/2 ton pick-up can only go 118-even though they both weigh about 3,800 lbs and the truck had 20 more hp ( 240 vs 220 ) and catalyst-free exhaust? Because the Firebird slices through the wind easier than the boxy truck. Very simple. Anyhow-I said-a '70's T/A has a drag coefficient of .048. The '82-90 model has a drag coefficient of .032-or .028 with the "Aero" package. That's about as low as your going to get with a production car. Even if they had the same amount of power-the '80's model would go way faster because of the aerodynamics. Secondly, the '70's T/A weighed about 3,800 lbs. The '80's model weighed about 3,200. So with the aerodynamics and the weight advantage-the '80's model would go much faster with the same amount of power. # 2. Bang for the buck. Like it or not nothing makes more power for less money than a big-block Chevy. Yes a Chrysler Hemi or Boss Nine Ford can make as much or more power-but at double or triple the cost. For example the GMPP 454 HO makes 440 hp and 500 lbs of torque for $5995. The 465 hp 426 Hemi that Mopar Performance sells retails for $14,995. The 472 and 510 Hemis are way more expensive than the 502 or 572 GMPP Rat Motors. As for the guys question about a 455 Pontiac-yes Butler performance and other companies offer 600 hp Pontiac motors-at a cost of $15,000 or more. Then he asks if a Fox-bodied Mustang could do 200 with a 347 stroker? Really? I just said you'd have a hard time doing it with a slippery T/A with a pumped to the gills 454 Chevy. Why would you think a "barn door" Mustang could do it with a 347 small-block?? Really?? Mastermind
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