Hey, A friend of mine picked up an unrestored 66 Corvette that was wrecked in 67 and in storage ever since. The holley carb suffered some damage when the aircleaner was ripped off from the car sliding on it's topside. The choke tower was bent and the vent tubes were bent also. I took on the job of rstoring the carb figuring I could straighten it out without finding another mainbody. The choke tower straightend perfect without a hint of repair and the vent tubes I replaced. But i also noticed the primary boosters are a little loose. I've heard of these coming loose before but honestly have never seen it on any of the carbs I've worked on over the years. Does anyone have a do it yourself fix for this? Sure has been strange working on this thing---You can tell the carb had never been apart-and it's 38 years old! I soaked everything in laquer thinner so the original color wouldn't be removed-should look like new. Just have to figure out how to tighten up these booster a bit. Bob

never mind, got them tightend up today, carb is all done and tried it out on test engine, no leaks and works mint. I noticed a strange thing on this carb that I've seen on some 2jets from the 60's, the main body had a four open holes drilled in it just over 1/16" in diameter into each barrell above the base plate. What is the purpose of having unfiltered air enter from these holes? I filled them with a slug of lead like I've done on the 2jets I've worked on. They make no sense to me.

The holes in the old 2-jets are to let gas fumes out during "hot soak". Some carbs have a bi-metal strip that opens a vent, others had an open bowl vent, still others had a vent that opened when the throttle went fully closed. I have never seen those holes on a Holley. What's the # of the Holley carb?
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Jon N.

"Those who grant sympathy to guilt grant none to innocence" Ayn Rand, Atlas Shrugged, 1957

list 2818, 600 cfm vacume secondary, basically an 1850 with a metering block from what I can see.

thanks for the info on the mysterious holes, I thought maybe GM wanted some unfiltered air in maybe to kill some life on these well built engines :D