VACUUM SCHEMATIC FOR 69 428CJ R CODE

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   Hi all, I am in the process to get all the vacuum lines correct on my 69 428CJ R CODE automatic C6 with factory air and original Holley carb. In the manual, volume 2, page 09-01-18 has the schematic(bottom one). Two questions...
1. Where is the air bypass valve? I don't find it in my engine compartment. The pic shows what looks like 3 hose connections on the valve along with a vacuum connection. I have three hose connections on my water valve along with 2 vacuum connections but the vacuum connections are for the lines coming through the firewall.

2. The schematic shows the yellow stripe line going to the carb. Does it go to the front diaphragm port on the passenger side? 

Clarification on this would be much appreciated. Thank you!!

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ELT Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 07-October-2024 Location: Cooperstown NY Status: Offline Points: 79	Post Options Post Reply Quote ELT Report Post Thanks(0) Quote Reply Topic: VACUUM SCHEMATIC FOR 69 428CJ R CODE Posted: 19-December-2024 at 5:45AM
	Hi all, I am in the process to get all the vacuum lines correct on my 69 428CJ R CODE automatic C6 with factory air and original Holley carb. In the manual, volume 2, page 09-01-18 has the schematic(bottom one). Two questions... 1. Where is the air bypass valve? I don't find it in my engine compartment. The pic shows what looks like 3 hose connections on the valve along with a vacuum connection. I have three hose connections on my water valve along with 2 vacuum connections but the vacuum connections are for the lines coming through the firewall. 2. The schematic shows the yellow stripe line going to the carb. Does it go to the front diaphragm port on the passenger side? Clarification on this would be much appreciated. Thank you!!
	Thanks,Ed

schufitz Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 23-February-2014 Location: Hammond IN Status: Offline Points: 266	Post Options Post Reply Quote schufitz Report Post Thanks(0) Quote Reply Posted: 19-December-2024 at 8:33AM
	Do you still have the smog pump and associated belt/hoses/air injectors at the exhaust manifold? The air bypass was part of that system, and those components were usually removed back then as it was a drag on performance, and they are not cheap to replace these days. See the Hot Rod article in the link below. Note section 14. It goes into details about the system. 428 Cobra Jet Engine Detailing, Part 2 Great document: cobrajet_engine_detail_v1.3.pdf If you google the Ford thermactor system, there are lots of good articles/pics/explanations. Edited by schufitz - 19-December-2024 at 8:48AM
	Dave 1969 Torino GT/351W 2V/FMX/Vinyl Top/Black Jade/Gold Stripes/Nugget Gold Buckets/Console/Racing Mirrors/AC/PS/PDB

ELT Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 07-October-2024 Location: Cooperstown NY Status: Offline Points: 79	Post Options Post Reply Quote ELT Report Post Thanks(0) Quote Reply Posted: 19-December-2024 at 9:53AM
	Wasn't the smog pump for California cars? My car was delivered to Texas and spent it's life there until I bought it. Are you saying that the air bypass valve is only for thermactor emission cars?
	Thanks,Ed

ELT Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 07-October-2024 Location: Cooperstown NY Status: Offline Points: 79	Post Options Post Reply Quote ELT Report Post Thanks(0) Quote Reply Posted: 19-December-2024 at 10:17AM
	I just read on one of your great links that all US cars had the smog system. Thank you for that. Still learning! As much as I want to bring things back to original, I will do so without replacing that system. So, does the yellow line go to the vacuum port on the passenger side in front of the choke on the carb?
	Thanks,Ed

ELT Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 07-October-2024 Location: Cooperstown NY Status: Offline Points: 79	Post Options Post Reply Quote ELT Report Post Thanks(0) Quote Reply Posted: 19-December-2024 at 3:32PM
	Took a good look at the original carb. It's the only vacuum port so that must be where the yellow striped hose attaches.
	Thanks,Ed