Timing and carb adjustment, low vacuum, 400 Ford - Ford Powerstroke Diesel Forum
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Old 03-30-2013, 10:53 PM
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Timing and carb adjustment, low vacuum, 400 Ford

First the specs.

400 Ford .010/.010/.040
stock cam advanced 4* with roller timing chain
Edelbrock dual plane intake with 650 Holley vacuum secondarys electric choke
MSD 6AL with MSD mechanical advance distributor

Problems:
10 inches vacuum at idle @ 900-1000 RPM, wont run any lower, will randomly jump to 19 inches, was idling on primarys untill i lowered the floats.

Carb likes to backfire every once in a while on acceleration

running 20* initial timing, seems to like this the most

Truck is a 4 speed with larger tires and I dont have the power that I assume I should be getting from a 400, I adjusted my assumption a little for the larger tires, but the truck acts the same when I put the T-case in low.

Any help, advice or point and laugh is greatly appreciated.
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Old 03-31-2013, 06:17 AM
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Old 03-31-2013, 07:03 PM
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