Big Block Tunnel Ram 660s Questions

71GSSDemon said

Thank you. I have read much on that site also, but I thought restricting the main air bleed made it start sooner.

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This comes up all the time. A bigger MAB will START the mains earlier. A smaller MAB will delay the start of the mains.

At low air flows the MAB is subject to very little pressure differential. So changing the MAB works the opposite of what most think.

If you want to delay the start of the mains, use a smaller MAB. It will be richer at higher air flows though.

IMO, most carbs have far too much MAB.