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454 hp figures

Discussion in 'The Garage' started by 76SILVERADO, Nov 7, 2003.

  1. 76SILVERADO

    76SILVERADO Registered Member

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    How much stock rated hp and tq on a 1976 454? I just picked up a 2wd with it. Going to put 454 in my 4x4.
     
  2. 76SILVERADO

    76SILVERADO Registered Member

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    Anyone have a chiltons with it?.... I searched but found nothing.

    Thanks
     
  3. crazyrc

    crazyrc 1/2 ton status

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    I believe its kind of a ridiculous number for a 454, but somewhere in the range of 235 if I recall. Thats not exact, but its close. Swap the cam, intake, carb and add some headers. Look for around 300-400HP depending on the cam.
     
  4. 76SILVERADO

    76SILVERADO Registered Member

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    Yeah im more of a small block person, but i thought the heads was the biggest restriction on the BB.
     
  5. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Yep it all depends on what heads are on the motor,Probably small oval port.you can check the casting numbers on this website-Mortec.com...............
     
  6. bablazer73

    bablazer73 1/2 ton status

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    The small "round ports" that were used on the truck engine's can really limet the RPM these engines will make power, but depending on what your doing, It can be a plus. The small intake ports can produce some awesome low-mid torque figures. intake and cam a must. but don't go nuts with the cam. I would go Comp-cams, and call them with all your info and they will give you a cam that WILL work. I run small ports with hyd rollor comp cams. 5,000 RPM max. lot's of driveshaft snappin torque!!
     
  7. k20

    k20 3/4 ton status

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    if you decide to replace the heads, the best oval port head are the 049 or 781 castings. They are identical, in i believe chevy hi performance, they compared them to the rectangles that came on the 70 ls6. 049 won. I found a set that had been ported and polished, i installed some 2.19/1.88 valves......waiting to see the results lol. But seriously i had the peanut port heads sittin here, put em next to the 049s, i shoulda took a pic. It was ridiculous size difference.
     
  8. supersize75k5

    supersize75k5 OrganDonorRacing.com

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    [ QUOTE ]
    if you decide to replace the heads, the best oval port head are the 049 or 781 castings. They are identical, in i believe chevy hi performance, they compared them to the rectangles that came on the 70 ls6. 049 won. I found a set that had been ported and polished, i installed some 2.19/1.88 valves......waiting to see the results lol. But seriously i had the peanut port heads sittin here, put em next to the 049s, i shoulda took a pic. It was ridiculous size difference.

    [/ QUOTE ]


    those are the same heads I currently have on my big block, huge difference from my old big block, I went with a mild cam though since I planned on putting my tbi on the motor.


    larger heads a cam, headers, intake and 3 inch exaust makes a world of difference /forums/images/graemlins/peace.gif
     
  9. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    [ QUOTE ]
    I believe its kind of a ridiculous number for a 454, but somewhere in the range of 235 if I recall.

    [/ QUOTE ]

    Net horsepower ( all accesories installed ) is way lower than gross horsepower ( at flywheel ) . My 165 hp 305 probably puts out 250 or so at the flywheel . A 76 454 will still put out good performance with the mods suggested , but will not do 400 hp net , maybe 400 hp at the flywheel . The old high compression LS6 only put out around 425-450 gross ( probably more , but conservatively rated ) /forums/images/graemlins/k5.gif
     
  10. boz42

    boz42 1/2 ton status GMOTM Winner

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    the 049's have 122cc combustion chamber so if u are looking to build a motor w/ a decent ratio pistons will be expensive. i run 049's & i had to run a 1/4" domed piston to get to 10:1.

    the 781 is the same head except it is a closed chamber head.
     
  11. k20

    k20 3/4 ton status

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  12. boz42

    boz42 1/2 ton status GMOTM Winner

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    ok i stand corrected on the head castings, tell me this i am under the impression there is an older casting that is identical to the 049, except it is a closed chamber. i thought it was the 781 but since it is not is there such a head?
     
  13. k20

    k20 3/4 ton status

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    Ive never heard of one, I know, i think its gm performance, is making new aluminum heads that are identical to the 049's, I dont have the part number however. If you find out about an 049 closed chamber post up, but like I said Ive never heard of one.
     

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