Which carb for my 89 High out put 302?

Discussion in 'Technical' started by Mercury-beast, Feb 13, 2010.

  1. Mercury-beast

    Mercury-beast Member

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  2. Mercury-beast

    Mercury-beast Member

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    :"(bumpppppp
     
  3. Bryant

    Bryant forgot more than learned

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    those are good also check out the holey hp series
    http://www.jegs.com/p/Holley/Holley-4150-Street-HP-Carburetors/757757/10002/-1

    if your motor is a stock 89ho then 650 cfm is to big. those motors are running out of power by 5500rpm and that doesnt even need 600 cfm. the smaller the cfm you run the beter the motor will run on the low end and the top end will be just as good if not beter.
     
  4. Mercury-beast

    Mercury-beast Member

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    well it might have aftermarket cam in it or might be a stroker has twisted wedge heads it came with a holley, guy said it was off a 1984 302 h.o , other then that idk, so you think a 600 will be ok?
    it has a performer 289 intake aswell

    you know how to measure a 1989 302 to see if its a stroker?
    im only 17 learning as i go basicly lol
     
  5. Mercury-beast

    Mercury-beast Member

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    also has afr roller rockers on it i think
     
  6. Bryant

    Bryant forgot more than learned

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    you do need to know what you have. to figure out if you have a stroker you need see if it has a stroker crank in it. you can pull the pan the look up at the bottom of the cylinder sleves to see if they have been ground for clearance for the longer stroke. there will be notches in the bottom of the cylinders. untill you know exactly what you have we can not help you that well.
    the performer 289 intake is bacily a stock intake recast in aluminum. that intake says that its not a stroker, doesnt rev much past 5500rpm and wont need more than 600cfm.
     
  7. baddad457

    baddad457 Member

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    :thumbs2: Listen to the man, he's giving you the truth here. Smaller is better when it comes to carb sizing. This isn't fuel injection here. A carb needs a vacuum signal under it to work properly. Vacuum is what draws the fuel out of the bowls into the engine. A carb that's too big sees less vacuum and doesn't work as well as a smaller carb that sees more vaccum. The flow velocity thru the venturis (these are the round objects sticking out into the throttle bores, that the fuel comes out of) is higher with a smaller carb, and the higher velocity does a better job of mixing the fuel with the air. Chances are, no carb larger than a 600 will work any better than a smaller sized carb on your motor. This is especially true of mechanical secondary carbs.
     
  8. darren

    darren Member

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    AMEN.:thumbs2::thumbs2::thumbs2:
     

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