1987 318 Tuning with Summit Carb

Bewy said
Sarguy,
Did you read post #46. I pointed out the Idle Feed Restrictions [ idle fuel jets ]. They are a fuel jet [ not an air bleed ] because it is immersed in the fuel in the fuel bowl. As I also said earlier, the 046 could be a misprint, which is why numbered drills are reqd to properly test the orifice size.

The two jets circled in red are probably the main air bleed or idle bleed. Do you have a drawing that shows what they are? No mention of them in the spec chart in post #25. It is also possible that they are the economizer jets, which controls off idle & low speed cruise calibration. Often in the 0.042-0.060" range.

Yes, I read it. The idle fuel restrictions (The inner brass tubes) are approx. .053 based on a number drill set. The screw in air bleeds circled in the pic measure at .043. These are what I ran at .039, .043, and was going to run at .046, but never actually tried .046.

In the parts diagram for the Summit and the Holley 4010, there are no bleeds shown in the picture, which is frustrating.

But, now that the ignition is sorted, I put the Summit carb back to .043 idle air bleeds, which is what it came with. I then reset the transfer slot and idle mixture screws. Getting ready to bolt it back on. The only thing I didn't change back to the out of the box config was the main and primary jets. It came with 68 / 73, and I put in 66 / 71, guessing that the 318 might not need that much fuel. However, jets are an quick change.