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Best manifold to convert to 4-71?

Discussion in 'The Hokey Ass Message Board' started by lowburban, Oct 23, 2010.

  1. Morrisman
    Joined: Dec 9, 2003
    Posts: 1,602

    Morrisman
    Member
    from England

    I'm toying with the idea of using a 6/71 just like that. Would stock type pressed steel Chevy multi-groove pulleys work, or would it need aluminum ones machining up?

    Or..

    Speedway sell aluminum triple pulleys for $38, might be an idea.

    [​IMG]
     
  2. lowburban
    Joined: Jan 9, 2003
    Posts: 446

    lowburban
    Member

    Somebody has to have pics of how they did their manifold conversion.
     
  3. Morrisman
    Joined: Dec 9, 2003
    Posts: 1,602

    Morrisman
    Member
    from England

  4. Deuces
    Joined: Nov 3, 2009
    Posts: 22,321

    Deuces
    Member
    from Michigan

    I thought all chevy 283 crankshafts were made of forged steel...... I could be wrong though..
     
  5. hotrod316
    Joined: Apr 7, 2010
    Posts: 43

    hotrod316
    Member
    from ohio


    SO when building the aluminum adapter after milling the carb mounting flange, the mounting bolt holes (for the adapter) will be drilled at the 3 degree to compensate for the carb mounting holes being tapped at the 3 degree dump, correct?
     
  6. No, not all 283 cranks were forged. That's one of those wives' tales.
     
  7. Papa Tom
    Joined: Jan 27, 2010
    Posts: 94

    Papa Tom
    Member

    i have a 471 mounted on a offy 2 4 360 intake it was all bolted together when i bought it the blower has a hand fabed snout runs a gilmer belt uses a short water pump it works really well i took it off my fed dragster its for sale
     
  8. Morrisman
    Joined: Dec 9, 2003
    Posts: 1,602

    Morrisman
    Member
    from England

    If you machine the manifold carb flangedead level, to take your adaptor, I'd open the holes out to the next size up, 3/8", drill and tap them straight up and down. Gives you a bit more strength to hold that blower in place.

    I'd also mill some flats elsewhere in a suitable position on the manifold, bolt some round ally bar in there to support the adaptor as well.
     
  9. dodored
    Joined: Feb 5, 2007
    Posts: 640

    dodored
    Member
    from Concord NC

    Why not find one one of those two piece tunnel ram intakes that are for a 2x4 set up. It would be a small issue of milling the bottom half down to accept a flange to bolt the blower to.
     
  10. lowburban
    Joined: Jan 9, 2003
    Posts: 446

    lowburban
    Member

    I thought of that too but haven't seen one that wouldn't sit the blower up real high above the valve covers. Think it would probably look kinda funny.
     
  11. c-10 simplex
    Joined: Aug 24, 2009
    Posts: 1,370

    c-10 simplex
    Member


    Ok, i found the link that originally got me thinking about this aspect of using blowers on sbcs.

    i'm not saying you will break the snout of the crank. All i'm saying is that i was searching for something totally unrelated and came upon this link and that's why it raises a concern for me:

    http://www.scatcrankshafts.com/scattechpdfs/Break_the_Nose.pdf
     
  12. lowburban
    Joined: Jan 9, 2003
    Posts: 446

    lowburban
    Member

    I'd like to see some pics of the lower pulley's on v belt systems. Anybody got pics?
     

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