holley 800 spreadbore on 350 sbc - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-09-2012, 08:51 PM
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holley 800 spreadbore on 350 sbc

can anyone tell me what jet and power valve sizes i should start with

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Old 08-09-2012, 10:25 PM
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Not without some motor specs. That's a lot of carb for a 350.
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Old 08-09-2012, 11:08 PM
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Ive used 850s on a 355 sbc.You need to tune it,great carb if you have one. I wouldnt look for one if I was buying a carb
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Old 08-10-2012, 06:08 AM
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350,good heads(p&p),eldebrock intake(performer),lunati cam(292-480)have a q-jet on it but not satisfied. i have a 600 holley(4160) and the 800 spreadbore. the 800 brought the 383 it was on to LIFE
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Old 08-10-2012, 11:06 AM
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I would prefer you use a 4777 to wake your car up.The 800 will need more tuning because it has huge secondaries for a 350.You have a very mild cam. The performer manifold will help you as long as you do not use a spacer.keep it a 2 plane intake. Bolt it on the way it is.Of course check the jets and PV first so you can have different parts on hand for changing.
does that carb have a pressed in booster venturi?Dyno time is expensive but a worth while investment
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Old 08-10-2012, 11:09 AM
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find the carb list number and look it up on the holley site. Start tuning with the stock default jetting for that model carb. (some have single pri power valve, some have both pri and sec power valves and different sec jetting.)

Use a 4.5" power valve for that lunati cam. You want a 2800++stall converter for that cam.
a 3500 stall is not too much. Recurve the distributor for 24deg at idle and 34 36deg at max advance., for that cam. A fully divided type spreadbore style carb spacer will help that carb on the performer manifold.
Edelbrock #8726

That cam does not like a stock stall torque converter. or a stock distributor advance curve.

The performer manifold tends to get too hot when open heat riser passages are used.
Get the manifold plenum temp right by blocking or restricting the heat riser passages (intake gasket)

Last edited by F-BIRD'88; 08-10-2012 at 11:15 AM.
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Old 08-10-2012, 11:16 AM
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From that point get a AFR gauge to help you dial in the jetting and accelerator pump shot.
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Old 08-10-2012, 03:44 PM
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Is it a vacuum or mechanical secondary?
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Old 08-10-2012, 07:21 PM
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mechanical.
thanks for the advice.
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