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Hot Rods 270'' GMC engines .... and a big thanks to 54 Earl

Discussion in 'The Hokey Ass Message Board' started by 302GMC, Apr 21, 2020.

  1. 302GMC
    Joined: Dec 15, 2005
    Posts: 6,918

    302GMC
    Member
    from Idaho

    Earl does GMCs 1.jpg Earl does GMCs 2.jpg The shiny one was fresh & ready to go back in when several serious health problems arose on my part. Earl took everything to his shop & is re-assembling things for me. Now, how to figure out a way to repay his kindness …. Thanks, buddy - I'd be dead now if it wasn't for you ….
    Engine in stand is a '58, just about stock - shaft & bore all standard, head shaved, dual Roch. Bs on a Nicson, & headers. Goes back into his '46 pickup.
    The one in the '54 is the 248 that came in it new. Bored .157 over, Arias 9 1/2 : 1 slugs, '59 270 crank, Delta reground cam, home made tube pushrods, Korean war 302 head with 327 intakes & GTO exhausts, hard seats & Kwik-Way guide liners. Dist. is a full centrifugal 1 1/2 ton GMC with a Remberlis (sp?) dual point plate. Ellis intake, Zenith 28 series carbs with adjustable main jets & electric chokes. '37-'48 Chev straight flange headers.
     
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  2. Gofannon
    Joined: Feb 8, 2007
    Posts: 684

    Gofannon
    Member

    That top pic is kind of arty. How safe is it to bore a Jimmy 0.157?
     
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  3. oldiron 440
    Joined: Dec 12, 2018
    Posts: 2,289

    oldiron 440
    Member

    I've got a feeling that it's your buddy telling you thanks for the things you have done........or just being a good friend.
     
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  4. 302GMC
    Joined: Dec 15, 2005
    Posts: 6,918

    302GMC
    Member
    from Idaho

    I'm not scared. Lots of old timers went 3/16'' on both 270 & 302 blocks. The 248 .157 over should be fine for highway driving.
     
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  5. Neb Hillbilly
    Joined: Dec 20, 2019
    Posts: 336

    Neb Hillbilly
    Member

    The 248 I bought was stupid over, like .280. Cylinders were too thin to be used. I love GMC inlines

    Sent from my S48c using The H.A.M.B. mobile app
     
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  6. Gofannon
    Joined: Feb 8, 2007
    Posts: 684

    Gofannon
    Member

    Both 270 blocks I have are sleeved. I'd like to build one .125" over (292 cu in), but that might require replacing the sleeves. Sounds like there will be enough meat in the walls to do that? I need to drag one out from under the bench and measure it.
     
  7. My buddy is pulling the sweet running 270 from his '58 pickup and I'm giving very serious thought to buying it and building a teeny 1 person roadster around it...a Modified. Something like this... speedwayday4.jpg
     
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  8. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,094

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    That is Beautiful......love to have it....but....can’t imagine getting into, or out of, it. :(
     
    loudbang likes this.
  9. Neb Hillbilly
    Joined: Dec 20, 2019
    Posts: 336

    Neb Hillbilly
    Member

    Depends on the year. In my thread it was claimed that early blocks are thicker. Mine is a '41 block and is bored to a 295. Sonic checking would likely be a must for most radical overbore.

    Sent from my S48c using The H.A.M.B. mobile app
     
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  10. RichFox
    Joined: Dec 3, 2006
    Posts: 10,020

    RichFox
    Member Emeritus

    1/8th over won't get you 292. You need to go .156 over. Many have. I did and ran 17 pounds boost But I was young and 270 were cheap. Never broke though. And set SCTA records.
     
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  11. 54EARL
    Joined: Oct 12, 2007
    Posts: 236

    54EARL
    Member
    from Idaho
    1. A-D Truckers

    Ted came along in a particularly interesting time in my life. I'd be willing to bet he had/has no idea the impact he had on me 25 years ago when I was a punk ass 17 year old ass bag. Between Ted my 54 Chevrolet and my beautiful bride of 20 years I live an amazing life I didn't see as a possibility.

    I took the top photo because these two engines sat not far from each other in the yard for I don't know how many years. Now they were once again like two old friends reminiscing. With any luck both 54 trucks will be on the road this summer. Now where is that ratchet.
     
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