The factory claims of 275 horsepower at 5,500 rpm and 340 lb-ft (3,200 rpm),
The guys at Hot Rod Magazine / Mopar Muscle built a nearly stock 340 and got:
320 horsepower at 5,500 rpm and 368 lb-ft at 3,500 rpm. +45 and +28
So it’s clear Mopar understated the facts by 45 horsepower and 28 lb-ft.
Then they upgraded to headers and got 352.1 horsepower and 395.9 lb-ft (at 3,200 rpm)—
77.1 horsepower and 55.9 lb-ft higher than published peak claims.
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that's just the regular 340, but with the 6 pack 340, and factory iron exhaust manifolds:
a Six Packr’s 1970 advertised claim was 290 horsepower at 5,000 rpm and 345 lb-ft at 3,200 rpm
the same new build returned 356 horsepower at 5,500 rpm and 382 lb-ft at 4,000 rpm.
Again, Chrysler was bettered by 66 horsepower and 37 lb-ft.
Finally, upgrading to headers resulted in another 20.1 horsepower and 26.9 lb-ft with readings of 376.1 horsepower at 5,500 rpm and 408.9 lb-ft at 4,000 rpm.
so, instead of the 4 barrel and headers, go with the 6 pack and headers, and you get another 24Hp, and 13 ft lbs.
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Seriously, when some simple header and ignition upgrades, maybe even a dyno tune, nets you 100 hp, why they hell wouldn't you?
Anyway, the 340 was underreported by the factory, by 75 Hp, just like the Hemi, which was also under reported by 75 Hp.
The 426 hemi was called 425Hp, at 5000 rpm, but it actually was 500 Hp at 6000 rpm
The competition was
SS350 Nova (295 horsepower),
W-31 Olds 350 (325 horsepower),
Pontiac 350 HO (325 horsepower)
and 351 Windsor four-barrel Mustang (290 horsepower)
and the 383 Road Runner was rated at 335 Hp
https://www.hotrod.com/articles/bad-mopars-340-beat-ford-chevy-shocking-new-data/
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