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Thread: Honest truth for 1970 455 and 455 Stage1

  1. #1
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    Honest truth for 1970 455 and 455 Stage1

    Over and over iv'e read that the true output on the 70 455 Stage1 was 400 to 420hp. and also heard Mr. Manner claim it was 376 hp.
    Iv'e also come come across that the Stage1 package only added 13hp. over the base 455.
    Factory fresh Stage1 car's time slips do indicate it could be 400hp.+ but as Mr. Manner quoted the Stage1 package was just that, carefully chosen pieces and settings that benefited off each other like the trannie shifting points, 3.64 rear and optimum timing to make it run that fast off the showroom floor, plus lot's of torque
    If they would to take 10 random Stage1 engines of the assembly line "which didn't suppose to have the best tollerances" what would be the average HP and TQ spec's?
    As much as iv'e tried I only have found one U tube video of a built to stock spec Stage1 dyno test and even then it had roller rockers but a lowered compression ratio down to 8.5 to 1 or 9 to 1. All else stock but after 3 pulls it just managed 400 hp. and 507ft.lbs

    I'm sorry I know this has been asked 1000's of times but I still can't find a good true power number

  2. #2
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    The engineer

    Mr. Manner claim it was 376 hp.
    "claim" is not appropriate. Mr Manner had the dyno to test and prove the HP. That is science.
    That is good enough for me. He is a no BS guy.
    Ted Nagel
    (6)65 Wildcats; 65 Riviera; 65 Special Wagon; 65 GS; 65 Skylark; 67 Wildcat; 67 California GS; (2)68 GS400; 69 GS 350; 70 GS Stage 1; Wanted: time to fix 'em

  3. #3
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    Quote Originally Posted by Ted Nagel View Post
    Mr. Manner claim it was 376 hp.
    "claim" is not appropriate. Mr Manner had the dyno to test and prove the HP. That is science.
    That is good enough for me. He is a no BS guy.
    He sure does put it straight
    Last edited by kookie1; 02-14-2018 at 01:51 PM.

  4. #4
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    Time slips are also "science".
    The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
    Vladimir Lenin

    Government schooling is about "the perfect organization of the hive."
    H.H. Goddard, Human Efficiency (1920)

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