mfg Posted February 1, 2023 Report Share Posted February 1, 2023 Torque of the 400 cubic inch engine,which was factory installed in several mid 70's Avanti ll's, is .....?..... ft lbs at 2400 RPM. 1) 285.....2) 335.....3) 390.....or......4) 420 Link to comment Share on other sites More sharing options...
mfg Posted February 1, 2023 Author Report Share Posted February 1, 2023 Ideas? Link to comment Share on other sites More sharing options...
pantera928 Posted February 1, 2023 Report Share Posted February 1, 2023 335 Bitten by the message timer again!!!!! Link to comment Share on other sites More sharing options...
1963r2 Posted February 1, 2023 Report Share Posted February 1, 2023 285 Link to comment Share on other sites More sharing options...
mfg Posted February 1, 2023 Author Report Share Posted February 1, 2023 2 hours ago, pantera928 said: 335 Bitten by the message timer again!!!!! No, not 335!🤔 Link to comment Share on other sites More sharing options...
mfg Posted February 1, 2023 Author Report Share Posted February 1, 2023 9 minutes ago, 1963r2 said: 285 No, not 285 either! Link to comment Share on other sites More sharing options...
pantera928 Posted February 2, 2023 Report Share Posted February 2, 2023 390 Link to comment Share on other sites More sharing options...
mfg Posted February 2, 2023 Author Report Share Posted February 2, 2023 17 minutes ago, pantera928 said: 390 That's it PanMan! 😄 Link to comment Share on other sites More sharing options...
brad Posted February 3, 2023 Report Share Posted February 3, 2023 Not correct. By the mid 70's manufacturers used NET figures, not GROSS figures in determining outputs. They were listed less than 1/2 of previous 60s figures. For instance, Chevrolet lists the 76 400 as 175 hp, and 305 ft lbs of torque. Link to comment Share on other sites More sharing options...
mfg Posted February 3, 2023 Author Report Share Posted February 3, 2023 1 hour ago, brad said: Not correct. By the mid 70's manufacturers used NET figures, not GROSS figures in determining outputs. They were listed less than 1/2 of previous 60s figures. For instance, Chevrolet lists the 76 400 as 175 hp, and 305 ft lbs of torque. So Avanti Motors lied to us??? 😄 Link to comment Share on other sites More sharing options...
Dwight FitzSimons Posted February 3, 2023 Report Share Posted February 3, 2023 IIRC 1971 was the first year for net horsepower and torque ratings on American cars & trucks. And (IIRC) 1971 was also the first year of much lower compression ratios, which lowered HP ratings. Smog equipment also contributed to lower ratings. --Dwight Link to comment Share on other sites More sharing options...
mfg Posted February 3, 2023 Author Report Share Posted February 3, 2023 Well, I'm not so sure Avanti Motors lied to us.... They claimed 390 ft lbs of torque from 400 cubic inches.... In '56, Studebaker claImed 380 ft lbs of torque from 352 cubic inches... What's up here? 🤔 Link to comment Share on other sites More sharing options...
Gunslinger Posted February 4, 2023 Report Share Posted February 4, 2023 A lot depends on the camshaft specs where the engine has its power and torque curve applied.  The 400…which can be turned into a real torque monster…was basically a station wagon engine.  Due to its intended use Chevy engineers gave it a more torquey camshaft design.  Link to comment Share on other sites More sharing options...
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