What do you think of this plug?

justinp61 said

Are you using a wide band or just tuning by the plugs? Have you reduced the main jets to lean it out up top? What did it do to the cruise? You mentioned at one point you had a lean surge, are the carbs four corner idle? Is there another idle speed screw on the secondary's?

I highly recommend some type of recording wide band, it's a wonderful tool for carb tuning.

My advice would be to reach out to Dom.

Click to expand...

Tuning with the plugs.

I only change the secondary main jets and the primary PVCR’s to change WOT. This particular plug is from a tunnel ram with 1:1 linkage and power valves in both ends, so I have the cruise pretty close. I only change the PVCR’s to change WOT on this application.

Carbs are 4 corner idle. The lean surge was from the T slot restricters being .004 too small. Opened them up and the lean surge was gone.

The one thing I didn’t do on these carbs was change the secondary linkage to an adjustable stop. Kicking myself for that. So you still have to pull the carbs to adjust secondary opening.

I’ll see if I have a decent video of it and post it here.