Quote from: Ed Vette on October 18, 2021, 04:17:41 PM
The power change definitely came around 1972 and later. The 70 Chevelle LS6 had 454/450Hp and the LS-7 had more HP. The Hemi Cuda in 1970 was a 426 with I recall 425 HP. The 454 Chevelle in 1972 was a dog because of the emissions regulations and I recall it had 370 HP. My dad's 68 Chrysler New Yorker with 375 PP and torque flight Transmission beat one. My friend had the 70 LS-6 and an LS-7. Another friend had a Pantera and a 63 Split Window Vette built out and another had a 69 Z-28 427 all built out too. All our cars were animals. My closest race was against another friend's 396 Chevelle. Raced 4 times in one night because we both missed 4th, once me and twice him. I eventually won by a half car length. My RR originally had 308 rear with a 295 first gear trans. It would kick in in third gear and blow away many cars that went off to an early lead. Then I put in a 457 rear, I had to start at a 5 mph roll when we raced. When I put that engine in the Cuda I had to put in welded Solid Motor mounts because the front end would rise and the torque would twist the front end and rip the drive shaft out of the tranny but then the drive shaft would snap off the rear so I had to weld Traction Bars. The good old days.
You are definitely they kind of guy I would have wanted to hang out with when I was a teen and early 20's. I lived for building muscle cars for the street. The major accident I had changed all that and I started working with a friend who raced modified stock cars on dirt tracks and kept my love for speed off the streets.
Anyway, been doing some research and this seems to be the best article on how, why, and when HP ratings changed. The guy seems knowlegable. Anyway: here's his spiel:
"Understanding Gross Versus Net Horsepower Ratings
Aaron Severson
April 15, 2008
Technology and Terminology
There are a lot of misunderstandings among car enthusiasts and historians about vintage horsepower ratings. It