what size carbs??

[chopper]

Rob:

As far as I can tell, yes, the secondaries are opening. The heavier secondary springs seemed to resolve a relatively heavy bog when the throttles were opened rapidly from low power position. How do you recommend reducing the power circuit by 50%? Is this something accomplished by changing the power valve or is some other type of modification required? The present problem is a frequent light "pop" out the sidepipes during moderate deceleration, with an occasional loud one during heavy deceleration. The pipes have been checked for leaks by a respected shop here in town, leading me to think the carbs are still just running too rich. Truth be told, I've never been really happy with these carbs and am wondering if the 0-9776 carbs may be a better way to go. The little Holley formula about carb size tells me I should be running about 850 cfm total anyway, perhaps two 450s would give better results?

Darrell:

I'm running the carbs on a H&M manifold which came on the car. The carbs are presently set up with a sort of "progressive" linkage. The engine idles through both carbs but the forward one opens slightly ahead of the aft due to a slot in the linkage on the aft carb. I have had several opinions expressed as to whether or not the linkage is supposed to operate this way. Some folks have said they think there's a locking piece missing and that both carbs should operate simultaneously. Others have told me that the linkage is supposed to run as a progressive unit. Any opinions?