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One more,in 65 Chrysler had a single 4bbl 413,rated at 360HP,10.10 comp,470 ft lbs torque,the 66 and later non HP 440's were rated at 350 horse,480 ft.lb torque. Even if you compare with a HP 440 at 375 horse,torque is still the same 480 ft.lbs,that's only 15hp and 10 ft.lbs of torque with 27 more cu.in.than the 413, with the old 516 heads and all three had the same comopression ratio.

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good point. if you go buy hp/ci the 360hp the 413 made should equate to 383hp for the non-hp 440 with superior cylinder heads.
seems the 440 is missing 33hp mabey that 225 \6 got it.

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Two points:

1. The 360hp version of the 413 had a hotter cam than the 350hp 440. (The New Yorker 413 had a milder cam than either of them and a 340hp rating.)

2. In the 50's and 60's, advertised horsepower ratings were often more about marketing than real horsepower. One of the worst examples was a 1958 Ford 352 that was supposed to have 300 horsepower but only made 200 actual horsepower on an engine (not chassis) dyno.

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