Need to have my memory "jogged". When I disassembled my "76/78 amc 360, I believe that I have a 1/2" threaded port on the back of the housing. Cannot remember for the life of me what it operated or if it is really necessary to reuse. I have been looking at replacing the housing and most new ones do not have this connection. I will be installing a holley truck avenger carb. on a performer intake.
1978 cj7 amc360 t18a/d20/teralow, f30posi/r44locked, T/A670, never quite finished but running to beat all hell.....
Controlled vacuum advance via coolant temp. Had a threaded 3 port temp controlled valve in the port. I run a locked dissy with MSD timing computer so mine is plugged.
If this new part can't break....what old part will??
That's where I fitted my mechanical temp gauge
" “It is said that men go mad in herds, and only come to their senses slowly, and one by one.." -Charles MacKay
"'The trouble with our liberal friends is not that they're ignorant; it's just that they know so much that isn't so.' "
-Ronald Reagan
VOTE
So is that port hooked up to my stock dist. only, because the dist. is a vacuum advance style?
1978 cj7 amc360 t18a/d20/teralow, f30posi/r44locked, T/A670, never quite finished but running to beat all hell.....
The thermostat switch stopped the vacuum advance until the engine warmed up for emissions reasons. Unless you want that totally stock look, just plug the hole and run the vacuum advance directly to the ported vacuum source on the side of the carb.
Bob
tufcj
1969 AMX
1967 Rambler Rogue
If you need a tool and don't buy it...
you'll eventually pay for it...
and not have it.
Henry Ford
It's part of the emmission control system. iirc, it locked out the vac advance untill the engine warmed up to lower emmissions and help the engine warm up faster. Most of the time this switch dies and is bypassed.
If you are going for a factory build, a TSM will have plenty of vac diagrams. The Cali smog vehicles had a lot more vacuum crap on it than the 49 state vehicles.
Otherwise, you can plug the hole where the switch is and run your dist off ported vac on the carb. (port on the carb that gets its vac signal just above the throttle plates)
Its a Jeep Thing --- No one understands!
"America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves."
-Abraham Lincoln
Thanks guys. May just look at deleting the port. Will check out the set-upwhen I get home.
1978 cj7 amc360 t18a/d20/teralow, f30posi/r44locked, T/A670, never quite finished but running to beat all hell.....
Mudrat"That's where I fitted my mechanical temp gauge
But you're not reading actual engine temp there, what happens if your thermostat gets stuck...I always put mine before the thermostat...any hole will do.
If this new part can't break....what old part will??
Good catch. I was going to say something in my previous post but CRS got the best of meOriginally Posted by jeep_man_401
Mudrat"That's where I fitted my mechanical temp gauge
But you're not reading actual engine temp there, what happens if your thermostat gets stuck...I always put mine before the thermostat...any hole will do.
Too bad AMC didn't put a port in the head like most chebby's...
Its a Jeep Thing --- No one understands!
"America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves."
-Abraham Lincoln
Posting Permissions
Reply With Quote