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Thread: 402 engine specs?
          
   
   

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  1. #1
    Firebird396 is offline CHR Member Visit my Photo Gallery
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    San Jose
    Car Year, Make, Model: 1967 Firebird
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    402 engine specs?

     



    I picked up a fresh rebuilt 402 from a buddy that got it from another guy that ended up not using it.
    My buddy picked it up directly from the machine shop when the motor was complete.
    I don't have any info on the motor because the buildup was around 7 years ago and the paperwork was lost.
    My buddy told me he thought it was a 1970 402 built to factory specs.
    I have all info I could find on the motor and was wondering if someone here may be able to help.
    The block is - 3999280
    Passenger head - GM4T 3964290
    Drivers Head - GM3T 3964290
    Intake - 3955287


    Any help would be great.
    Thanks, Ken

  2. #2
    minnik is offline CHR Member Visit my Photo Gallery
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    Traverse City
    Car Year, Make, Model: 1966 impala
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    type big block chevy in your browser, lots of info
    does not a 280 block,could it be 290 last 3 #s
    came up with 240 hp 2bolt block
    heads show up to 350 hp
    intake shows LS-3 up to 350 hp

    it's a way of life

  3. #3
    Firebird396 is offline CHR Member Visit my Photo Gallery
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    Thanks for the info.
    I just found the information searching with Google.
    I couldn't find the block either.
    I will check tonight when I get home
    Thanks,
    Ken

  4. #4
    DennyW is offline Junior Member Visit my Photo Gallery
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    Car Year, Make, Model: catch 22
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    Maybe you read the block numbers wrong. 3999290.

    3999290....396.......68-69...2 or 4 bolt, Truck
    3999290....402.......70-72...2 or 4 bolt, Truck
    3999290....402.......72......2 or 4 bolt, Passenger

  5. #5
    Firebird396 is offline CHR Member Visit my Photo Gallery
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    Well, It looks like more than likely a truck block from what Denny shows
    the guy I got the motor from said he thought it was out of a 1970 El Camino.
    Would they use truck blocks in El Camino's?
    The heads and intake show 1969-70.
    I just hope it isn't a low compression later model 402
    I got my buddy searching for the build sheet but with 7 years and 1 divorce, it doesn't look positive!
    Thanks for all the help.
    Ken

  6. #6
    Firebird396 is offline CHR Member Visit my Photo Gallery
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    Well, I checked again and the block numbers were 290 not 280.
    Maybe my eye sight is starting to finally go at 41 years.
    Anyone know if the 240 hp motor would have dish pistons?
    I was able to look down the sparkplug hole and the motor has flat top pistons. Couldn't see any valve reliefs but didn't really have the space to see much.
    Any help would be great.
    Thanks, Ken

  7. #7
    DennyW is offline Junior Member Visit my Photo Gallery
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    Originally posted by Firebird396
    Well, I checked again and the block numbers were 290 not 280.
    Maybe my eye sight is starting to finally go at 41 years.
    Anyone know if the 240 hp motor would have dish pistons?
    I was able to look down the sparkplug hole and the motor has flat top pistons. Couldn't see any valve reliefs but didn't really have the space to see much.
    Any help would be great.
    Thanks, Ken
    I don't know if you have found this page, but, it's kinda nice, and at the bottom it has a few links to some more that may help.

    http://www.roadsters.com/bbc/

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