A/F Tuning advice needed. LZ21 twin weber DCOE40's

[hobbes_the_cat]

I just hooked up my Innovate wide band gauge up to my 510 with a LZ21 with twin weber 40's. Now I need to get it tuned. I'm looking for advice on jetting my DCOE's. Under load it stays around low 14's to high 12's. Numbers get lower as the RPM's go higher. My big concern though is that on hard deceleration the gauge spikes and pegs at 22.4. It won't idle below around 2000 RPM. I figured that was because of the .552/302 cam I'm running but maybe my idle jet is too lean? If I left out any necessary info let me know. Current jetting is what they came with when I bought them used. They are rebuilt and synced. Fuel pressure is a stable 2.5-3 psi. Main-135. Idle-60. Choke-32. Needle-200. Pump jet-35. Emulsion-F15. Starter jet-60 F5. Any help from the gurus? :hairy:

[datzenmike]

22.5 is extremely lean and can melt the piston tops. idle and light cruise can be in the 14.8 range but hard acceleration should be in the 12s maybe even high 11s.

[hobbes_the_cat]

Yeah I know it's way too lean, I just want to know what circuit I should be looking at. Seems weird to me that its only on deceleration. If I blip the throttle it bounces back around 13-14.

[datzenmike]

My bad didn't see deceleration. That's not important. The throttle is closed so only fuel for idle is available but more air than needed is sucked in.

[hobbes_the_cat]

Oh. So it's nothing to worry about? I figured if it EVER was that lean it was a bad thing, but if its normal I'll stop worrying about it and focus on fine tuning.

[datzenmike]

Throttle closed and it shouldn't matter. Maybe someone can elaborate.