460 question
Thread Starter
|
New User
Joined: Sep 2005
Posts: 21
Likes: 0
460 question
I posted earlier in the 73-79 pickup forum but realized this is probably the better place to be asking. Did ford ever connect the vacuum advance directly to manifold vacuum via the 4180 factory carb on a 460. This is on my 79 f250. From what I can tell from the vacuum diagram it appears that the advance connects to the carb and there is only one port to connect it to on the bottom of the carb and it is manifold vacuum. The reason why I am asking, is that I put on a new edelbrock 1406 and just wanted to be sure that it was connected right. It did have all of the typical 79 smog stuff-egr,pump, etc. But is all removed now. It is connected to ported vacuum now but can be changed if that is not right. Thanks in advance.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Actually there is a temperature switch by the thermostat that has both the carb ported vacuum and manifold vacuum to it, plus a feed to the dist vacuum advance unit. When the engine temp gets high (almost always when stuck in bumper to bumper traffic) the vacuum switch changes the dist. vacuum feed from the standard carb ported vacuum to the manifold vacuum. This causes an increase in engine rpm to help cool the motor down. When temp comes down, it switches back to the carb ported vacuum. Other than that, no on the manifold vacuum to the dist..
