Vacuum advance 83 454
I need to know whether or not my vacuum advance goes to ported or manifold vacuum on my 454. I have all factory emissions hooked up (ca smog). i'll attach the diagram for my truck. It shows it going from the back of the carb, through a check valve (which is also connected to spark tvs).
thanks for any help. loosely related...
I've got the truck running ok, but its wanting more advance. I currently have it at 6 BTDC. The factory spec is 4 BTDC, 6 should be within the acceptable margin for smog. Motor specs are relatively stock, so is there adjustments to the carb I need to make to help? at 12-16 BTDC it runs pretty fantastic. But, at least for the smog, I can't have it that advanced.
thanks for any advice
Zack
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1967 CHEVELLE MALIBU 427/700R4
1971 CHEYENNE 10 350/350
1983 GMC K3500 454/400/205
1987 R10 TBI 350/700R4
2014 CRUZE 2.0 TURBO DIESEL
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