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Old 05-17-2009, 05:39 AM
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Baseline carb settings on blown sbc

Hi, i was wondering if anyone could help me work a baseline setting for my blown chevy 350 specs are,

chevy 350 standard bore
speed pro forged flat top pistons cr 8.47-1
edelbrock performer rpm heads w/ 70cc chambers
scat forged rods
eagle forged crank
all arp'd
comp cams magnum 286h flat tapped cam 490'/490' 286 dur @ 50'
gmc 6/71 blower running 8% under drive
2 600 vac secondary holleys
i understand every engine is different and i have not opened up the carbs to check jets/power valves specs and whether the carbs have been boost referenced but if anyone has a similar setup their specs would be a good baseline for me.
thank you

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Old 05-19-2009, 04:45 AM
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The best advice I can give you is to make sure the carbs run on the rich side. All blower motors run warmer and at idle most will run fine, but out on the road at speed, I have seen them lean out and make the motor shoot up in temp. I set up a friends blown Hemi with 2 600 holleys. We started with 74 primary,76 secondary. You must take the bowls off those carbs and see what size jetting you have.
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Old 05-19-2009, 11:33 AM
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If you don't have one all ready get a wide-band O2 sensor. Don't rely only on plug readings.

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