Re: [AMC-list] OT: enging heating strangely

[tom jennings <tomj@xxxxxxx>]

Get a timing light out and check vacuum advance and mechanical advance,
separately. Timing and carb issues can seem similar sometimes, and spark
timing is easy to measure!

Going up a hill with load means low vacuum means less spark advance. Late
timing usually means heat-into-the-head and out the pipe but if you have
fouled up timing or something else (timing chain issue?) it could make no
sense.

I wouldn't worry about the carb until spark is sorted.

On Sat, Jun 5, 2010 at 8:36 PM, <das24rules@xxxxxxxxx> wrote:

> so, my work truck ('77 ford f250 4x4) has a strange heating issue. when no
> or
> light load, it heats up. idling, or cruising down flat highway at 60mph. it
> gets quite hot. if im going up a good hill, or pulling my trailer, it stays
> right at 180*. it is a modified block. i think 351m not 400. has edelbrock
> intake, edelbrock carb, new distributor (factory ford electronic). it also
> doesnt feel like the secondary valves are working on the carb. you cant
> feel
> anything when you put your foot into it. it has a stiffer spring on
> secondaries so you can feel when you get into them on the foot, motor makes
> o
> difference. i stay out of them all i can. it gets a whopping 8mpg too. the
> heating issue has me just baffled.
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