carb tuning question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

evilokc · 05-22-2018, 12:21 AM

my truck is running pretty well but I have some questions about tuning the mixture on my holley. to start I know my carb needs larger main jets. I used a vacuum gauge to set the mixture. i plugged into the constant manifold and set the screws (all4) out 1&1/2 turns then adjusted then while watching the vacuum gauge. once it was at the highest reading i took it out and it went lean on me.

1) the highest reading is the correct mixture?

2) if the main jets are to small will i be able to get the mixture right?

3) when you change the jets do you need to reset the mixture?

05-22-2018, 12:21 AM	#1
evilokc Registered User Join Date: Mar 2013 Location: albuquerque New Mexico Posts: 522	carb tuning question my truck is running pretty well but I have some questions about tuning the mixture on my holley. to start I know my carb needs larger main jets. I used a vacuum gauge to set the mixture. i plugged into the constant manifold and set the screws (all4) out 1&1/2 turns then adjusted then while watching the vacuum gauge. once it was at the highest reading i took it out and it went lean on me. 1) the highest reading is the correct mixture? 2) if the main jets are to small will i be able to get the mixture right? 3) when you change the jets do you need to reset the mixture?



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