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Technical Searching for a SBC flywheel experience. Speedmaster brand ????

Discussion in 'The Hokey Ass Message Board' started by hotrodA, Jun 4, 2023.


    Help please on the flywheel for my 40’s SBC swap.
    I’ve tried LuK and Pioneer, but they’re single drilled and tapped for big Pressure plate bolt pattern.
    Unfortunately not enough meat to redrill for B&B.
    Has anyone had my experience with this Speedmaster brand flywheel?
    Carried by Summit, Speedway and Jeg’s.
    This brand looks like the only affordable (at least for my wallet) flywheel to fit my SBC.
    Here are the specs I need:
    Late model ‘90 350, one piece RMS, external balance, 168 tooth, must be drilled for Borg and Beck pressure plate.

  2. Bob Lowry
    Joined: Jan 19, 2020
    Posts: 1,394

    Bob Lowry

    Is your SBC internally balanced or externally balanced? Above is for external only.
    Mr48chev likes this.
  3. Mr48chev
    Joined: Dec 28, 2007
    Posts: 33,372


    All 168 tooth chevy flywheels early (2 piece seal) or as in your case late(1 pieceseal) are going to be within a few RCH of the exact same diameter as they have to fit the 168 tooth ring gear. If there isn't enough meat (diameter) for the Borg and Beck pressure plate you have you have the wrong pressure plate not the wrong flywheel .
    SPEC likes this.
  4. squirrel
    Joined: Sep 23, 2004
    Posts: 55,007


    All stock 86-up one piece rear main seal small blocks are external balanced, aren't they?

    I think he means he wants one drilled with the 10.4" clutch pressure plate bolt pattern, like the 153 tooth flywheel would be?

  5. Fordors
    Joined: Sep 22, 2016
    Posts: 5,139


    I’m assuming you want the 168 tooth ‘wheel because you already have the starter that has the staggered bolt pattern. In looking at the photo of the f/w in the link you posted it looks as though it is drilled for both an 11” and 10 1/2” Borg & Beck clutch bolt pattern.
    Last edited: Jun 5, 2023
  6. I already have the 1310 B&B pressure plate with 11-5/8” bolt pattern on early SBC 168 tooth flywheel, with adapter for SBC/early Ford trans.
    Engine (283) has a knock, so switching to late model SBC.

    Looking for feedback on this particular brand, please.
    Big Al likes this.
  7. SEAAIRE354
    Joined: Sep 7, 2015
    Posts: 530


    This isn’t an answer to your question but more of a PSA. I purchased a Summit flywheel for the post 86 externally balanced 350 and the engine had a bad vibration which it didn’t have before. I found an OEM unit and all is good. If your having the crank balanced it can be done to your new flywheel but it sounds like your just installing A running engine. That Speedway piece seems nice so maybe a higher quality than the one I got.
  8. 427 sleeper
    Joined: Mar 8, 2017
    Posts: 2,689

    427 sleeper

    Always thought that diaphram and B&B were the same pattern. The difference is the diameter, hence the need for 2 set's of hole's.

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