Topic: Carb Vacume Question
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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I'm not good with pics but the # is 7042208. according to my ID info is as follows,
70=Rochester ID
42=1972
2 =49 states 5=california
0 or a 1 or 2 = Chevy
8=auto even# = auto odd # = manuel trans
I called the carb shop that rebuilt it and he said that top tube was for the vac advance but he didnt know if it was full intake vacume or not. He said he thought it was after it had reached operating temp and chock had pulled off. So I guess I'll leave my vacume advance hooked up to it for now.
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That's what I was afraid of. That is not your original carb. If you had an original carb before you took it to the shop it appears they pulled a fast one on you.
KOPBET 2008-05-24 10:34:28
You can get a vacuum gauge and hook it to where the choke pull-off is hooked up, and if you see full manifold vacuum all the time then that is where it goes.
The vacuum advance location described to you can be checked the same way. If there is little or no vacuum at idle then that is a ported location and is a suitable location depending on your engine configuration.
my AIM book shows this carb for the LS5 big block with the advance coming off just like it is. But now I'm wondering if it has the wrong metering rods and stuff in it. I guess I'll do some inquiring next week with the local carb guys. I looked at the site rraider1 had and he's correct. Since it showes truck 350 it may be the same carb just metered differantly. First I'll chew out the guy that rebuilt it for not telling me.
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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