Thread: Linkage adjustment on QFT/Holley two fours
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Old 04-01-2011, 06:45 AM
Learjockey1 Learjockey1 is offline
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Location: Stuttgart, GE
Cobra Make, Engine: ERA #539/427 Holman Moody #7HM20 from 1967
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Default Linkage adjustment on QFT/Holley two fours
Question: what is a good start on adjusting /tuning the slotted opening of the second carb primaries coming into play. They are the Survival Motorsports/ QFT vintage carbs.

First quarter, Midway or last quarter of the slot?

What is a good start??

427, 282S, RPM heads, 10.3:1, Street driving but do not need it leaning out at partial throttle 90-100 mph with 3:54 at about 3,000 rpms.

I guess I am answering my own question as I type, leading to the fuel/air mix FAST tool and welding bungs in the side pipes to really get the answer without holing pistons.
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