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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 1993f250 on September 10, 2017, 01:10:09 AM
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So i just got a new engine and trans going and so far its pretty good but im having trouble with the fine tuning. Th350 and 350 mild head work, cam 230/230 @50, rpm intake, msd hei, edelbrock 1406, 2000 stall(b&m holeshot).
Over 3500k it hauls and putting around its ok but give it too much gas and get into the secondaries and it bogs or stumbles tjen starts to pick up.
About 14.5vac at 850-900rpm
Timing is 25 initial 35 total
.95 secondaries .98 main jets .70 x .37 rods. Leaned out or like this the bog is still there but its better now that i richened it. Still wont spin the tires, ive had half dead 350s that would spin the tires..
Any help is much appreciated
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Check fuel hoses for kinked or collapsed bends. Adjust your detent cable. Try advancing the timing more and validate your timing marks.
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Check operation of the accelerator pump.
I also think you're running rich with those rods and jets.
I tuned mine with an AFR meter. Here's the setup I have. It's probably close for you.
secondary metering jets: Edelbrock 1426, 0.095" (stock jet)
primary metering jets: Edelbrock 1425, 0.092"
metering rods: Edelbrock 1461, 0.065" cruise, 0.057" power
step-up springs: 8#
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Check operation of the accelerator pump.
I also think you're running rich with those rods and jets.
I tuned mine with an AFR meter. Here's the setup I have. It's probably close for you.
secondary metering jets: Edelbrock 1426, 0.095" (stock jet)
primary metering jets: Edelbrock 1425, 0.092"
metering rods: Edelbrock 1461, 0.065" cruise, 0.057" power
step-up springs: 8#
Thanks for that!
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I tried so many combinations with no change and i narrowed it down to the secondaries opening too soon.
Found a holley 600 vaccumm secondary, you can adjust these ones. The problem is gone, it runs 100 times better
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