Re: Stromberg WW Main Jetting Recommendation
White plugs and backfire through the carb sure sounds like it's lean. Stock jets in those are .055" I believe. Could be an accelerator pump problem or maybe a low float level. If your vacuum was low I would say check the PCV valves.
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.
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