help me with these vacuum ports
06-25-2012 | 03:04 PM
#1
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Joined: Jan 2012
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From: Milwaukee
Car: 1984 Z28
Engine: Vortec 350, hotcam
Transmission: T56
Axle/Gears: 3.73
help me with these vacuum ports
Does anyone know what these ports are for? I know the big one is PCV but I don't know the others. any help is appreciated. carb is a quadrajet 4MV
06-26-2012 | 05:46 PM
#2
Joined: Sep 2005
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: help me with these vacuum ports
Smaller one at the bottom is just another vacuum port.
Right side at bottom of fuel bowl is ported vacuum for the archaic EGR system of the 70s.
Upper left is ported vacuum (different port from the previous one) for vac adv.
Looks like a 704 series carb... hopelessly 70s emissions crippled.... I sure wouldn't put it on anything I was expecting to run good, and ESPECIALLY not anything with ANY MORE cam than a 929. (194°/204° more or less)
Right side at bottom of fuel bowl is ported vacuum for the archaic EGR system of the 70s.
Upper left is ported vacuum (different port from the previous one) for vac adv.
Looks like a 704 series carb... hopelessly 70s emissions crippled.... I sure wouldn't put it on anything I was expecting to run good, and ESPECIALLY not anything with ANY MORE cam than a 929. (194°/204° more or less)
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