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Old 07-01-2013, 02:54 AM
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carburetor

does anyone know the float ajustments on a Rochester 17057253

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Old 07-01-2013, 07:55 AM
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this will get you started.
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Old 07-01-2013, 10:53 AM
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1/4" usually does the trick
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Old 07-01-2013, 11:12 AM
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Quote:
Originally Posted by edomingue3 View Post
does anyone know the float ajustments on a Rochester 17057253
1976-'77 Olds 350 Q-jet, emissions calibrated. For an AT car despite the odd number. I believe it originally had 73 jets, 49K primary rods and CV secondary rods. Hot air choke.

Float level:
Start at 0.420, that should be right in the sweet spot. If it’s too lean, raise it some, but you shouldn’t need to go more than 0.375”.

If this carb is on a modified engine, you'll prollably need to tune it to give more fuel in the idle/off idle areas, as well as changing primary rods. The secondary side should be OK as-is if it's stock. You can check for full opening of the secondary air valve and throttle blades.
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Old 07-01-2013, 11:44 PM
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Lars suggests .375" - .400".
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