Jetting help, modified holley

[ZZ4Blazer]

I have an Edelbrock A/f meter that I installed while my truck was down. Its reading my truck is running way too lean.



I installed a Proform carb body on my 650 holley double pumper. I thought I was running too rich before, and I even jetted it up to compensate for the more air the carb body flows.



Before in the stock carb without the meter, I had 69\'s and 77\'s in it. Now, I have 72\'s and 84\'s.



It will read around 13.1 a/f at idle, but as soon as I drive it it drops below 15.1,(the last measurement on the meter) It won\'t read until I let off the gas, then it will read rich for a second.



Im probably gonna jet it up some more, and try and get a more accurate reading/better mixture. Those jets seem big to me. Should I be looking into a non accurate reading, or do those jets not seem big enough



This is on my zz4 crate, motors stock internally.

[bohn333]

that seems really rich to me..i always go by what the plugs look like not a gauge. Put it in park run it to redline and shut it off before it gets time to rev back down. If the plugs are really white then your running to lean if there dark its to rich.



reading plugs is a lost art, and it will tell you alot.

[Fergusonic]

I agree w/ bohn333 in that the plugs would tell a good \"story\" . ZZ4 engine is a good engine...really solidly built. good luck.

[wickeds10]

them jets seem fine i was running the same in the truck in my sig and i bumped it up from there cause i had the nitrous