A guide to building the lil guy. The Mighty 300

Discussion in 'Small Block Tech' started by Joe65SkylarkGS, Oct 27, 2009.

  1. Mart

    Mart Gold level member

    Jim, did you entertain the idea of having a flat shoulder instead of the 27 degree design. Anything will probably work.
    I know all rod corners have to be corner clearanced with roller cams....only all on one side for balance. With my Pankls, I had to cut into the rod bolt thread some.

    Gotta do whatever it takes to make it work...:)

    Attached Files:

  2. Jim Blackwood

    Jim Blackwood Well-Known Member

    I think a square shoulder would have been better but that would have meant machining the cam itself and any later one swapped in afterwards. I didn't want to do that.

    Today I begin final cleaning and installation of the rings and circlips and then the main cap stabilizer plate. Hope to have the bottom end buttoned up soon.

  3. Jim Nichols

    Jim Nichols Well-Known Member

    Desktop Dyno of LT4 Hot cam specs with 10.5 compression at flywheel. Probably a little optimistic but the TA aluminum heads are as good as most aftermarket Chevy heads. Love the TQ curve. lt4 hot cam.jpg
    sean Buick 76 likes this.
  4. Jim Blackwood

    Jim Blackwood Well-Known Member

    [QUOTE="Mart, post: 3294835, member: With my Pankls, I had to cut into the rod bolt thread some. [/QUOTE]

    Correct for mine too. Got into the 2nd or 3rd thread in the rod just a bit. But the bolts were untouched.

  5. Jim Blackwood

    Jim Blackwood Well-Known Member

    A lot depends on the exhaust. I probably have the only MGB with full length balanced headers for a Buick engine. Most are running shortie headers which are a little better than an iron manifold but have no scavenging effect. The difference could easily be 50 hp in some cases. So Mike's 300 rwhp is reasonably close to desktop dyno's prediction. Plus it's a 300, not a 346.

    Jim Nichols likes this.

    RUBBERRODDER Active Member

    Recently I picked up an aluminum intake and aluminum heads for one of my 300's. The intake has a couple of broke off bolts that need to be addressed. The heads have been rebuilt and the valves and ports look great. BUT, at some point somebody Way over tightened one spark plug and stripped it out. I inspected the rest of the plug holes and they all look good.
    And that brings me to today. I just picked up a third little "Wildcat 355" out of a neighbors 1964 Skylark. His plans are going the "Pro-touring" route. Tubular control arms, bigger tires, LS engine swap, 4l80e transmission. I swapped him my 2 naked seat frames and $100 for it. Now I have 3 engines to play with. One in the car, and 2 in the garage for spare parts and/or rebuilds.
    sean Buick 76 likes this.
  7. Jim Blackwood

    Jim Blackwood Well-Known Member

    Keep in mind that if you pick up a set of late Rover heads and use those in the build it opens the door to a direct swap later on if you like for TA heads as the chamber volume is the same.


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