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    Author Topic: Crate h.p. ratings...  (Read 851 times)

    Offline gafletch

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    Crate h.p. ratings...
    « on: October 29, 2014 - 09:43:34 PM »
    ATK advertises in Classic Industries' Mopar catalogue. They have a stock bore/stroke 440 (I think around page 396), with Edelbrock heads and intake and a hydraulic cam that is rated at 520 h.p.  How can that be?!  What am I missing?
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    Offline Strawdawg

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      • Vortex Buicks
    Re: Crate h.p. ratings...
    « Reply #1 on: October 29, 2014 - 10:02:10 PM »
    good cam, headers, and good carb should do it
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    Offline cudabob496

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    Re: Crate h.p. ratings...
    « Reply #2 on: October 29, 2014 - 11:12:00 PM »
    seems reasonable, those heads flow pretty well I think.
    that's probably peak hp at around 6000 rpm.
    It is said that making hp equal to 1.25 times the displacement of an engine, with just
    common performance add-ons, is easy to do.

    So, you got 500 cu in, then say hello to 625 hp!
    « Last Edit: October 30, 2014 - 04:30:30 AM by cudabob496 »
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    72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

    1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

    2011 Kawasaki Z1000

    Offline Chryco Psycho

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    • 70 Challenger R/T SE 70 tube Chassis Cuda now sold
    Re: Crate h.p. ratings...
    « Reply #3 on: October 30, 2014 - 10:53:23 PM »
    Hp is ambiguous , different dynos read differently , we used to beat up 500 hp chevys with 400 hp 440s so this sounds optomistic to me , we gained exaclty 3 hp with Eddy heads over ported factory iron heads on a dyno . they are probably rating in Shetland pony HP not Clydesdales  :smilielol:
    « Last Edit: November 01, 2014 - 09:20:29 PM by Chryco Psycho »
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    Challenger - You`ll wish You Hadn`t

    Offline dpcd67

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    Re: Crate h.p. ratings...
    « Reply #4 on: November 01, 2014 - 04:23:21 PM »
    That's funny; Shetland pony HP vs Clydesdales.
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    1963 Dodge M37 (3)
    1967 Dodge WM300 (2)
    1971 Plymouth Duster
    Bought new in '71; I wanted the Challenger but they were $2850; too much $ so I got the 318, 3 speed on the floor, Twister Duster for $2100.
    1973 Plymouth Barracuda
    I ain't done yet.
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