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We finally found the problem and now solved. After checking and trying about everything imaginable, we found the primary metering block was the problem and had never seen a metering block be the fault in all the hundreds of Holley’s I have worked on. In finding the problem we replaced the...

We found the problem and now solved. After checking and trying about everything imaginable, we found the primary metering block was the problem and had never seen a metering block be the fault in all the hundreds of Holley’s I have worked on. In finding the problem we replaced the meter block...

Ted, appreciate your replying with comments and suggestions. We will be running it through the ultrasonic cleaner again and pay specific attention to the idle circuits in the body and both metering blocks. We had already checked for warpage on the body and throttle plate with a straight edge...

Sal, Since we have check all circuits for vacuum leaks I’m pretty sure now the idle circuit in the body or possibly the metering block may be plugged even though they looked to be cleanwith spraying carbs cleaner and blowing compressed air through every hole. Didn’t mention previously we...

We have in the shop a 57 T bird 312 with Holley 1273-2S 554 that sat on the car not run for 35+years, since it sat so long not running we replaced the tank, flushed the lines, installed new fuel pump and rebuilt the carb. The carb was cleaned in my ultrasonic cleaner using cleaning solution made...

We have in the s hop a 57 T bird 312 with Holley 1273-2S 554 that sat on the car not run for 35+years, since it sat so long not running we replaced the tank, flushed the lines, installed new fuel pump and rebuilt the carb. The carb was cleaned in my ultrasonic cleaner using cleaning solution...