The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Hard vacuum line to the carb

**tim71** · 08-03-2020, 07:43 PM

My 71 K1500 with v8 350 had the hard line from the Distributor to the CEC valve. I'm not sure what years used the CEC valve that turned the vacuum on or off based on several different engine/transmission conditions. When I acquired my truck the hard line was present, but the CEC valve was bypassed. I've never really figured out the correct routing as every way I've tried doesn't seem right. I would like to see any photos out there that show the factory routing.

08-03-2020, 07:43 PM	#3
tim71 Senior Member Join Date: Oct 2015 Location: Brownsburg, IN Posts: 1,072	Re: Hard vacuum line to the carb - questions. My 71 K1500 with v8 350 had the hard line from the Distributor to the CEC valve. I'm not sure what years used the CEC valve that turned the vacuum on or off based on several different engine/transmission conditions. When I acquired my truck the hard line was present, but the CEC valve was bypassed. I've never really figured out the correct routing as every way I've tried doesn't seem right. I would like to see any photos out there that show the factory routing. Attached Images __________________ 1972 Blazer Highlander 1971 GMC K1500 SWB (sold)