71monteme Posted April 24, 2004 Share Posted April 24, 2004 what reading do i use to put in the correct power valve? at the intake or at the carb's. thnaks for the help. thanh Link to comment Share on other sites More sharing options...
Monte Posted April 24, 2004 Share Posted April 24, 2004 The best way is to first take a vacuum gauge and set your idle mixture screws. You should adjust your idle mixture to the highest vacuum reading you can get. Make sure when you start if one screw is out 1 1/2 then make sure the others are the same turns out. Keep all the screws balanced until you get the best vacuum reading. Its usually best to go 1/4 turn at a time. Once you have the highest vacuum reading then turn them back out 1/8 to 1/4 turn each. If you have a 4 corner idle carb then it should be 1/8 on each. If its a 2 corner idle then 1/4. Then put the car in gear and check the vacuum reading. What ever the reading is in gear buy a power valve that is 2 sizes smaller then that. Or you could always use the stock size power valve which in a Holley is usually 5.5. Monte Link to comment Share on other sites More sharing options...
Monte Posted April 24, 2004 Share Posted April 24, 2004 When I read this after I posted it I realized I didnt answer the question. It should be manifold vacuum. The carb base plate is fine. Monte Link to comment Share on other sites More sharing options...
OutLaw !!! Posted April 24, 2004 Share Posted April 24, 2004 Monte is RIGHT but let the car warm up first.It makes it easyer to ajust. Just my two cents.Not trying to step on your toes Monte. Link to comment Share on other sites More sharing options...
71monteme Posted April 24, 2004 Author Share Posted April 24, 2004 thanks guys. thanh Link to comment Share on other sites More sharing options...
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