Originally Posted by F-BIRD'88
When I did mine I had to fine tune the primary idle air bleeds further.
(My donor carb was a 700DP).. Needed a slightly smaller primary idle air bleed to get it just right.
Soldered up the 75 and redrileed with a .062" 1/16" drill bit. Then hand honed it to the size needed with the drill bit until it was dead nuts. It is about .064" +/-. The AFR gauge allows you to really dial in the idle circuit.
It was balky off idle. Off idle lean spot ....Now it is very sharp and smooth.
Depends a lot on which metering blocks (donor carb) you use.
the idle air bleeds in the stock donor carb body are your clue. Have a look.
Yah, i found the post from when you first did yours, I'm likely going to order an AFR guage next month and work on fine tuning....I had a btch of a time finding bleeds today, I did eventually find some and will pick them up tommorow. For now I'm just going to run the reccomended 75-36-36-75 primary and 36-36-36-36 secondary (for 2 corner idle). It pisses me off that Proform includes the extra bleeds for their mainbody for 2 corner idle but the genuine Holley ($40 more) didnt. The metering blocks are from my 4779