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I was freshening up my vacuum hoses and noticed the vacuum advance connector butts right up against the a/c bracket. Is this common? The tube has to be bent to the point of pinching. The one that was on there had thinner walls and was more pliable (where it wasn't heat hardened), but the one I replaced it with has a thicker O.D. and much stiffer
I didn't have a chance to take any vacuum readings. I was home on leave for a short while and had a million things to do. It starts, idles and drives fine in park, but it does idle rougher when warm and in gear.
That's not good. Some kind of L fitting might be a workaround but the question would be what caused the issue to begin with. Was a different distributor installed at some point, or was it stabbed incorrectly.
It was like that when I bought it and I had no visual point of reference as this has been my first and only 460 motor. The truck has always driven well through various conditions - highway @ 70mph, cold start, acceleration, etc. It idles rough when warm and in gear - that has been the worst thing to occur.
The whole hose change event started when I noticed the rubber cap on the carb spacer for a second vacuum connection was cracked and dry. I checked the hose to the vacuum advance and it was pretty heat hardened on the end close to the manifold so I swapped it out. As stated above, the outside diameter of the new hose is thicker. The net effect was just a tad bit rougher warm in gear idle, which doesn't seem to be a symptom of a pinched vacuum advance hose. Unfortunately, my time home ended so I could not search for a thinner o.d. hose, but I wanted to start researching the a/c bracket and vacuum advance connector proximity. I was hoping someone else with a factory a/c 460 could confirm what it should look like.
dogman, here's a pic of my 460. My vac line has a bend on the end but I can't tell if it came that way or just formed because of age. It's hard to tell in your close-up photo but it looks like your dizzy may be retarded by a tooth
I never checked timing because it never ran that bad so I would not have considered that right off the bat. Unfortunately, I can't verify timing until I am home again, which will be awhile.
Although the 460 is a transplant (original 400 motor), I am assuming it is a factory a/c set up that came off the donor vehicle. The truck interior is set up for factory air - it has the vents and the controller with the slider has a position for a/c.
Thanks for the picture - very helpful. I will have my wife try to get a better shot for me to post that is clear and shows more of the area.
This is the best engine shot I have, but it doesn't show the bracket and vacuum advance.
But it does show you vac advance pointing in a different direction than fuzzybob's. You should try pulling the distributor and moving it over a tooth or two.
It may be possible for the timing to be at specification, but it's the housing that is off (and why they are suggesting reinstallation to get everything according to Hoyle.)
The rotor needs a fair amount of windage when installing to line up with #1 tower because of the helical gear. Very common mistake.
I totally agree the vacuum advance canister looks way out of position (retarded timing) but before you move it a tooth .. check the rotor position with the motor set a TDC (top dead center) to see if its proximity to the number 1 plug wire .. If you need a walk through how to do this just say so ..
Well no. I had to look him up. I don't get it, lol
"According to Hoyle" is a poker term. Tex Williams recorded a song called "Downtown Poker Club" where he talks about playing poker "according to that guy they call 'hoylie'". I'm kind of an old country music nut.
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