[fastd]

another update:

After several iterations and multiple mail orders, including blocking off the rear PV, I finally got my WOT to richen up to the low 13s mainly by increasing the PVCR from the factory size of 70 to 76 in the front and 78 in the rear. Decreasing the HSAB from 34 to 26 & 28 (gonna move the 28s to 26s) helped but not significantly. I am targeting 12.5-13 WOT a/f ratio so I am going to increase the 76s to 78s and maybe the 78s to 80s if I need to.

Based on my experience and comments (Holley tech told me it was a drag carb - of course they didn't mention that when I called initially for a suggestion of what would fit), I do think that the Holley 850 XP is a lean carb so beware. I like the carb though because of its extra large fuel bowls with clear fuel level sights, adjustable air bleeds/and emulsion jets, idle bypass value...

I am still lean at 2/3-3/4 throttle when I am into the secondaries but not into the PVs. I can't really increase the PV from my 4.5 in front and 3.5 in back because it's pretty easy to be a 5.5" when I am warming the car up on initial start and sometimes on part throttle acceleration and all the time when the a/c is running. I don't even want to tell the size of the secondary main jet I installed cause I'll get lambasted for it so I will put it this way: increasing is 2ndary jet size are not richening this part of the curve; typically I think that would mean that I would need to decrease the HSAB size but I can't go lower than 26 and I this HSABs 1: don't really move the "needle" to much and 2: I this HSAB impact WOT more than cruise/acceleration when the 2ndaries kick in. If I can get the WOT perfect, then won't spend too much time at 3/4 throttle.

Thanks for your previous comments and suggestions.

Regards.