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Finally figured it out!!!

68MUDSTUD

68MUDSTUD

OCD with shiny things
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ok guys, my 71 K-5 isnt runnin very good... 350/th350/205

It runs greaT when its cold

it doesnt run worth a crap when it has been run on the highway for about 5 miles.

New:
distributor
alternator
battery
carb
intake

its got a rebuilt HEI in it, and it works. no doubt about the distributor. the funny thing is though, ill set it on about 4-6 deg advanced, and it just runs crappy, so i end up advancing it so far, it doesnt register on my timing tab on the timing cover.

THEN, when i finally get into town, after cruizing 5 miles on gravel, and 10 miles on highway, cruise about 60-65, ill pull into town, and as soon as i get slowed down enough to pull into town pump, itll die on me. it doesnt do this when its cold.

anyone got any ideas??
thanks in advance.
 
Vacume leak maybe?
Spray carb cleaner around your intake with it running and if your RPM rises then you have a vac leak.
Fuel filter? Sometimes after sitting, cooling down time, the crap in a fuel filter will 'fall' then when you run the engine the crap sucks back up and blocks the fuel..
hmmm spark is next...maybe make sure your dist isn't installed 180deg out? well it should run like crap al the time so...??
just my .01.5c hehhehee
 
ok, first of all, this HEI was on it when i bought it, and was on it before that guy bought it, second, there is no ceramic block on firewall, so i am good there, third, i replaced all fuel lines, and douched tank thoroughly, uhhh did i miss anything?

i got to thinking about it, and do you guys think my coil in the top of my cap could be bad? thats the next thing im gonna try, ill rob the one my 68 had in it since its pretty much brand new.
 
Sounds like vapor lock?
Does your new fuel line run by your exhaust? I suffered from this last year after I installed a new exhaust . I had to reroute the fuel line to the outside of the frame rail to keep the fuel from vaporizing before it even entered the engine compartment. It helped to have a see through filter close to the carburetor so I could see if it was getting fuel.
 
that MIGHT be part of the problem, but im not sure, i do have a filter right by the carb, ill see if i got any next time i run into town. im kinda thinkin about getting rid of these headers, just for heat problems. what do you guys think?
 
68MUDSTUD said:
that MIGHT be part of the problem, but im not sure, i do have a filter right by the carb, ill see if i got any next time i run into town. im kinda thinkin about getting rid of these headers, just for heat problems. what do you guys think?
Click to expand...

If I were to do it again I would do away with the headers. They leak, they kill starters, and for me they were part of my vapor lock problem.

Yeah, next time this happens, look at your filter (if it is a clear one) to see if there is gas in it.
 
alright gas, if i have to take em off, ill ship em to you for uhhhhhhhh 50 bux.:D
 
68MUDSTUD said:
ok, first of all, this HEI was on it when i bought it, and was on it before that guy bought it, second, there is no ceramic block on firewall, so i am good there, third, i replaced all fuel lines, and douched tank thoroughly, uhhh did i miss anything?

i got to thinking about it, and do you guys think my coil in the top of my cap could be bad? thats the next thing im gonna try, ill rob the one my 68 had in it since its pretty much brand new.
Click to expand...

Some vehicles came with a resistor wire instead of the ceramic resistor for the coil. I would make sure you are not using that wire for the HEI or the choke or they won't work properly. If the resistor wire was used on the electric choke it won't fully open which could cause your problem. I removed that wire from my fuse block and replaced it with a good grade copper wire when I converted to HEI.

Brent
 
where does the electric choke wire connect to? how bout that hot wire to the HEI?
 
The choke can connect to the hot wire to the HEI if it is not a resistor wire. If you have a multi-meter check that wire and make sure you are getting a full 12 volts.
 
Well guys, i figured out what my problem was FINALLY... you know the ignition control module, in the distributor, well, that was taking a BIG Sh**... runs great now though!!! I am finally once again complete!
 
starter saver for headers

I cut a mech heat sleave aprt to put over the starter.Use the thumb part over the sol, an the rest over the motor body. It has worked on the same started for years.;)
 
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