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Old 04-05-2013, 10:12 PM
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Tuning tunnelram twin Edelbrock 750's

Ok, down to tuning the twin Edelbrock 750's on my Edelbrock street tunnelram. I have the carb manual from Edelbrock but they just talk about one carb. My question is: how close is this to being correct for tuning twin carbs? Can a guy still go by they're recommendations? I'm thinking that with the twin carbs set at the factory jetting and needles it's gonna be way rich. Where is a good starting point? I just got my LM-2 AFR meter and need a good starting point on the jets and needles.

355 CI
11:1
Comp cams XR292R
Duration @ .050 254 intake 260 exhaust
Lift .582 .588
Edelbrock TR1YX tunnel ram 2 x 750 Edelbrocks
Ported double hump 2.02/1.60 3891462 64cc heads
700R4/3500 stall
3.90:1 ford 9"
Race weight 3257
80% Street/ 20% strip car

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Old 04-05-2013, 11:06 PM
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The ed 750 on a single manifold is rated at 1.5 " mercury. A dual carb tunnel ram would pull at .5" mercury. That lands your total cfm around 850.

A little over carbureted , but in the ball park for tunnel ram application goodness.

I would start near the baseline. Refer to the rod/jet diagram after that to see where to go.
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Old 04-06-2013, 02:21 AM
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I ran 2x750 cfm on a flat tappet 355.I played with the metering rods a little,they worked well.( mine were carters)
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Old 04-06-2013, 10:52 AM
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You want to start with the default jetting. Thats what the AFR meter is for.
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