engine problem

[PKRWUD]

Originally posted by jim_howard_pdx
Peckerwood has you on the right road.

REBUILD THE CARB
Get a Barry Grant rebuild kit.
Get a Can of Carb Cleaner.
Dissassemble the carb and soak everything at least overnight.
Wash the soaked parts in HOT water, then wash them a second time, then wash them a third time.
Blow out every circuit with carb cleaner and then with compressed air.
Replace the power control valve(s)

Since you have cammed UP, you are going to be WAY LEAN. This is disastrous for an engine. You probably need to jet up 2 to 3 jet sizes if you had a GT based car and 4-6 jet sizes if you had a grocery getter.

Holley stamps each jet with a number that is simply a reference tool. The number by itself has NO REAL MEANING. But if you have 70's for instance. you might try 73 or 74 jets as a baseline. Then jet up or down by two size increments.

As you do your rebuild, use a backfire control valve which costs about 8.00 from spectre. This will prevent future PCV blowouts. This is a must on any holley.

I like to plug read a car. At proper jetting the plug with be light gray or light tan depending on what the fuel company adds to make the octane number of the gasoline you burn. If you are way lean, it will be gray, so do not accept gray as a finish line. You must jet up until it goes sooty. Then you know you are rich. Now back down to where the soot goes away and you have mostly tan or gray.

If you have a metering plate instead of a metering block in the secondaries, you should buy the holley kit to convert to the metering block. Now you will be able to jet the secondaries.

If you have a secondary power control valve I like to use the holley plug to close that down, then jet up 3-4 sizes from the primary venturis.

Or, you could have me build you one.

I'm not cheap, though.