Vehicle should be driven at various steady speeds and vacuum readings In either case, the power valve selected should have a vacuum opening point about 2" Hg below the intake manifold vacuum reading taken.Ī stock engine, or one that is only mildly built for street use, will have high If the vehicle is equipped with an automatic transmission, take the vacuum reading with the engine thoroughly warmed up and idling in gear.
#Whatsize power valve stock 1850 holley manual
Vehicle has a manual transmission, take the vacuum reading with the engine High overlap camshaft will have low manifold vacuum at idle speeds. Check here for specific Muscle car Info: Referenced by Holley 1850-2 This Site Designed By EagleHosting. This carburetor has a part number of 1850-2 and used on 600 CFM. A competition or race engine which has a long duration This carburetor was made by Holley, The Holley Brothers Company was started in 1905 in Detroit Michigan then became the Holley Carburetor Co. Such as Holley P/N 26-501, should be used when determining the correct When the engine vacuum drops to 6.5" or below. For example, the number "65" indicates that the power valve will open
Holley power valve is stamped with a number to indicate the vacuum opening Operated power enrichment system and a selection of power valves isĪvailable to "time" this system's operation to your specific needs. The power enrichment system supplies additional fuel to the main systemĭuring heavy load or full power situations. The folowing's quoted from Holley tech page So upon checking the Holley site I'm relieved that my memory's not gone.yet! But I agree, I'd stick with the 6.5Hg valve too. Bracketeer, after reading your reply i questioned my memory as I was sure what I said was valid.
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