In process of changing out thermostat and hoses, I noticed this crusty old vacuum valve which the Google machine tells me is called a Thermal Ignition Control Valve or TIC valve. I found a paragraph on it in the FSM and apparently it's intended to add advance/increase idle speed if the engine gets overly hot. One of the vaccuum lines from the TIC valve goes to the vacuum advance unit on distributor, which is consistent with what the FSM said, and the other two I presume go to manifold and ported vacuum sources but I didn't trace them.
So I'm thinking of just capping this thing off and running the distributor advance directly off of ported carb vacuum. In other words, leaving valve in place but bypassing and forgetting about it. I will recheck timing etc when everything is all back together, but wanted to just run it up the C BODY flagpole and see if the collective brain trust had any thoughts on bypassing the TIC vs. keeping it alive. Car is '73 Imperial, 440 w Edelbrock 1406 carb. Thanks !
So I'm thinking of just capping this thing off and running the distributor advance directly off of ported carb vacuum. In other words, leaving valve in place but bypassing and forgetting about it. I will recheck timing etc when everything is all back together, but wanted to just run it up the C BODY flagpole and see if the collective brain trust had any thoughts on bypassing the TIC vs. keeping it alive. Car is '73 Imperial, 440 w Edelbrock 1406 carb. Thanks !