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flywheel / ED: clutch question

Discussion in 'The Garage' started by B_to_C, Sep 17, 2006.

  1. B_to_C

    B_to_C 1/2 ton status Author

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    I have a flywheel and clutch off a 1979 350 (a 2 piece rear main seal correct?)

    And I want to put the flywheel and clutch onto my 1990 350 (1 piece rear main seal)

    After doing some research I'm confused...do I need a new flywheel?
     
    Last edited: Sep 18, 2006
  2. 73k5blazer

    73k5blazer Unplug the matrix cable from the back of your head Premium Member

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    Yes. All 1985 and before SB chevy engines were internally balanced.The 86-up flywheels have a counterweight, required by the crankshaft for the engine to be balanced. The bolt pattern is also a little different.
     
  3. B_to_C

    B_to_C 1/2 ton status Author

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    :doah: Thanks for that.

    Since I have to buy a new flywheel do I have to buy a new clutch? Are they different between the two styles of flywhees? Is there a measurement you can take with a caliper to see how worn a clutch is...or how do you tell how much life a clutch has in it by looking at it? Should I replace it anyways since everything's apart? :doah:
     
  4. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    I would replace it while it's apart. I hear the Napa Gold clutches are good.

    I also read that the style pressure plate you have with the 3 prongs is hard on the leg.
     
  5. dheavychevy38

    dheavychevy38 1/2 ton status Premium Member

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    Not to hi jack but does nyone have the part # for the new style flywheel
     
  6. 1977k5

    1977k5 3/4 ton status Vendor

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    Yeah, my 3 prong style replacement clutch sucked. The centerforce I have now is 10 million times better in every way :D
     
  7. clstolten

    clstolten 1/2 ton status

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    What sucked about your 3 prong style clutch? Was it just the force required to push the pedal or something else? Reason I ask is because that is what I installed on my K5(not driveable yet). I want to know what I have to look forward too. Thanks.
     
  8. 1977k5

    1977k5 3/4 ton status Vendor

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    It was a NAPA replacement clutch (3 prong pressure plate). Compared to the original one (140K) that was in the truck it felt alot better. When I built the 383 I replaced the NAPA clutch with a centerforce II. The centerforce engages smoother, has less pedal effort and can grab WAY harder if it needs to. I am a big fan of centerforce clutches :D.
     

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