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History Tom Cobbs: Blown Chevy

Discussion in 'Traditional Hot Rods' started by Ryan, Jul 21, 2025.

  1. Fordors
    Joined: Sep 22, 2016
    Posts: 6,282

    Fordors
    Member

    Tom had the rocker oiling covered @bchctybob , he metered the flow with this valve. He no doubt used the minimum he thought necessary. I’ve seen a couple black and white photos previously but these give more angles and show much detail.

    IMG_4258.jpeg
     
  2. hudsonjoe49
    Joined: Jan 1, 2007
    Posts: 261

    hudsonjoe49
    Member

    Here’s the portable work station that Tom built for Bonneville. All the necessary engine tools were stored in there. I have most of his tools and his Bonneville pit tool box as well as his Lathe, 1940s delta machinery and drill press. A lot of Jack Engle custom blower camshafts and handmade radius lifters. Loads of aircraft hardware, his entire AN fitting collection. Tom handmade everything. He had money and could buy anything at anytime but he chose to build a better mousetrap.
     

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  3. hudsonjoe49
    Joined: Jan 1, 2007
    Posts: 261

    hudsonjoe49
    Member

    And this was an early block. Tom used a J&E full roller custom cam. And this was still pulse oiling circulation system. These engines were from Stu Hilborn. I have a NOS 283 that was Tom’s and he loosely mapped out mods with an oil pen on the block. I’ll post that one of
    These days. I’m moving a fleet of cars and parts to my new shop where this stuff can be displayed.
     
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  4. Mitchell Rish
    Joined: Jun 10, 2007
    Posts: 2,279

    Mitchell Rish
    Member
    from Houston MS

    Impressive is all I can say.
     
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  5. Ryan
    Joined: Jan 2, 1995
    Posts: 22,504

    Ryan
    ADMINISTRATOR
    Staff Member

    Alex told me about the money thing, but he didn’t really know how he made it. Just that you would never know he had it… Do you have any idea?

    The camera stuff he was using in the late 50s and early 60s cost more than a new Ford at the time… and I’ve been told he financed a good chunk of So-Cal’s ‘53 bonneville campaign.
     
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  6. Moriarity
    Joined: Apr 11, 2001
    Posts: 35,956

    Moriarity
    SUPER MODERATOR
    Staff Member

    I think that number 3 in your picture is nothing more than a very precise throttle pivot..... having the support spread over the whole distance of a valve cover takes almost all of the "jiggle" out of the linkage...
     
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  7. hudsonjoe49
    Joined: Jan 1, 2007
    Posts: 261

    hudsonjoe49
    Member

    His pops was a big international tobacco dealer.
     
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  8. jnaki
    Joined: Jan 1, 2015
    Posts: 10,985

    jnaki

    upload_2025-7-27_3-40-55.png
    The directory is labeled “Blown Chevy,” and the only breadcrumb left behind was a dried-up piece of masking tape slapped on a negative sleeve like a warning label from the gods:

    “1956. 265-inch Chevy for the coupe. Final build. 400hp.”


    Hello,

    Impressive build and 400 h.p. to boot. A 265 c.i. motor ! My brother’s idea for another build was an Altered Coupe for our first build. That would have given us the ability to move the motor 25% back in the chassis and still close the hood, without any injector to stick upward outside. That was one original concept we fiddled around until, he realized, the whole build was to have a dual purpose race car, ability to race at Lion’s Dragstrip and drive it to school, too.

    We were influenced by the early Dragmaster Group from Carlsbad, CA. Another early drag racer at Lion’s Dragstrip was Kenny Lindley/Don Hampton front 671 supercharged race car. But, that was on a Hemi. So, the Dragmaster Group was competitive with a front drive SBC motor vs. the big Hemi race cars.
    upload_2025-7-27_3-42-4.png
    The original Dragmaster chassis from the original builders set the pace as one of the most popular race car chassis for any class. The front blower drive SBC motor was the original concept that became the go to race car setup, as low and streamlined as possible.


    Jnaki

    It was a difficult decision not to have a front drive 671 blower for our 283 SBC. But, it would have moved our motor back so as not to qualify for the street legal set up as the rules implied. YRMV

    We had a 283 with 6 carbs on top and that was our start. But, eventually, we were able to get a new Isky Gilmer/Edlebrock blower drive and were ready to go for the class racing with a blower spec motor. Although, we were inches away from building the Potvin style front blower motor and move into the Altered Coupe classes.
    upload_2025-7-27_3-44-28.png
    400 hp, at least, but 600 hp? Perhaps, as it was good for a 12:6o e.t. and 112 mph for the quarter mile. The times were getting better and quicker as my brother was learning the methods to shift and get his timing at the starts organized. Tons of stop light practices to get off of the starting line as quick as possible was the goal.

    It was one nice sounding SBC motor and was a little intimidating when first fired up. YRMV
    upload_2025-7-27_3-47-30.png

     
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