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#1
10-27-2008, 09:47 PM
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holley to rochester carb change
i just took off my holley carb on my 69 gp which is stock except for a new cam and lifters installed 200 miles ago.i had a pontiac performer intake with the holley and put the original intake along with a rochester four barrell back on the 400 motor.when i started the car it ran rough and when i shut it off it had pre ignition.my question is could the timing be off or is it possible i put a vacuum line on the wrong port? the rochester was sitting for about a year so i did not rebuild it
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#2
10-28-2008, 02:16 AM
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You've probably got a vacuum leak, somewhere. Did you use the right intake gaskets?
__________________
Rich The real democratic American idea is, not that every man shall be on a level with every other man, but that every man shall have liberty to be what God made him, without hindrance. Henry Ward Beecher "The problem with socialism is that you eventually run out of other people's money." Margaret Thatcher |
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#3
10-28-2008, 04:03 PM
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yes the gaskets are correct.i also noticed when i raced the engine and let off on the gas the mufflers do not sound right. there are two ports only on the carb,one was not used and had been blocked ,and the big one in front i have the brake booster only.can i run a tee off the big one and connect the tranny,booster and vac advance and keep the other blocked? thanks for any input
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#4
10-28-2008, 09:01 PM
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Need more info. When you say it ran rough, do you mean it idled rough? Or it ran rough all the time?
Was this the original carb or off something else? Card number? What do you mean, 'the mufflers did not sound right'? Popping, backfiring? There are more than two vacuum ports on a q'jet. Can you post pics of the carb? |
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#5
10-28-2008, 10:23 PM
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yes it idled rough and would not stay running.it was back firing out the exhaust.carb # 7029207 .i only see one small port and the the bigger one under the fuel line.i do not know what the carb came off. i can post picture tomorrow. thanks
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#6
10-28-2008, 10:36 PM
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just looked up carb # 69 chevrolet corvette 350. i hope that does not make a difference
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#7
10-30-2008, 06:03 PM
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found the problem.the carb had a vacuum port normally where the electric choke is.
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