Still Looking for Big Valve 350 Heads

Discussion in 'Small Block Tech' started by knucklebusted, Dec 21, 2020.

  1. knucklebusted

    knucklebusted Well-Known Member

    Yeah, if I were to go the aluminum head route, I would be putting in a 455 since I have a complete motor laying around. This is a low buck effort to improve slightly without going full mental. I've crossed that line many times in the past. I'm getting better at not overdoing it.
     
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  2. Sebambam

    Sebambam Well-Known Member

    Yea i was about to say good luck with that part ahaha
     
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  3. Mark Demko

    Mark Demko Well-Known Member

    LMAO, go full mental, I am:D
    I had givin' thought going big block years ago, even got a complete 455 with a rod knock outta a '73 Le Sabre for free. Couldnt bring myself to swapping my 350.
     
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  4. knucklebusted

    knucklebusted Well-Known Member

    My spare 455 is the small-valve I pulled out of my car to install the aluminum-headed motor in. It was fine when I pulled it and stored in my heated/air conditioned garage. I turn it a quarter turn every month or so. The spare one is milder and has the boss drilled in the side for clutch lever and the crank appears to have most of a pilot hole in it. May not be all the way down square. Swapping would be pretty easy, new clutch kit and flywheel, frame pads and headers are the bare minimum. I have a 4-core radiator in storage. I could run the Holley off the 350 to get it going but I'd need a good quadrajet eventually. I have a full new exhaust for the 350 headers that is 2.5" that would work just fine with the 455 as well.
     
  5. knucklebusted

    knucklebusted Well-Known Member

    Still looking for a set of big valve 350 heads.

    I'm slowly getting it there. The motor is almost out. Just need to cut the exhaust and disconnect the z-bar to pull engine and M20 trans together.
     
  6. 71gs3504sp

    71gs3504sp Well-Known Member

    I'm slowly getting it there. The motor is almost out. Just need to cut the exhaust and disconnect the z-bar to pull engine and M20 trans together.[/QUOTE]

    Didn't 71 GS's come stock with M21 trans? My original 71 GS350 and other one I parted out both had M21 trans? Just asking?
     
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  7. knucklebusted

    knucklebusted Well-Known Member

    Didn't 71 GS's come stock with M21 trans? My original 71 GS350 and other one I parted out both had M21 trans? Just asking?[/QUOTE]

    Yes, it did. I swapped in an M20 and it helped the 3.08 gears a lot over the M21 but it still needs more so the M23Z is going in its place.
     
  8. nekkidhillbilly

    nekkidhillbilly escaped mental patient

    id be interested in some that someone already ported....
     
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