what main jet/p valve combo to run

[black87yj]

I pulled my mc2150 with .050 main jets off my 4.2l where it ran fine and put it on my 360 mopar in my yj and it seems to run rich ? would a .046 jet cure that or help at all with the mileage ? wouldnt mind getting above 9-10 lol. jeep is running great idle starts good and runs well at wot but does stumble at take off a little. i,m running mopar 360 with 727/np207 with stock axles and 32s. the power band is greatly improved over my sick 258 but the exhaust pipe is black and sooty ?
thanks !

 

[Jester32]

Best thing is drive it with a vacumn guage and jet till vacumn drops and go back two jet sizes. That's what I do on all my motors. Works great but takes a bit of time.

 

[black87yj]

Best thing is drive it with a vacumn guage and jet till vacumn drops and go back two jet sizes. That's what I do on all my motors. Works great but takes a bit of time.

thanks jester !

 

[Jester32]

Anytime. Any other questions feel free to ask.

 

[Jester32]

Check idle vacumn and make sure power valve is two or three sizes under that. But that's Holley sizing may be diff on your carb.

 

[Jester32]

And of course make sure float is set proper to. Lol. If the carb was pulled off some dirt may have entered the seat, or float could be disturbed.