Posted by nrowles on July 25, 2018 at 07:24:23 from (71.251.155.138):
I know I'm on a tractor site but maybe you guys can help. Already asked this on another auto related forum and not getting much response. I have a 1965 Mustang with a mildly built 351W. Cam, heads, etc. Car seems to have gotten a little sluggish on low end so I started some diagnostics. All done with engine at operating temp. Timing mark of 0 has been confirmed to tdc. Distributor does not have vacuum advance.
Vacuum (port on bottom of carb) - bounces between 10.5-11.5 at 750 rpm
Timing
750 rpm - 18 - I get a slight 5 degree jump about every 8 seconds or so
1800 rpm - 30
3000 rpm - 36
3750 rpm - 40 - maxed out here
Vacuum seems ok for a mild build? My understanding is that worked engines can have a lower vacuum.
Should the slight jump in timing be a concern or can that be normal with a car like this?
Do my timing numbers seem a bit high? Would it be ok to keep the vacuum gauge hooked up to the bottom of the carb and dial in the timing that way? My understanding is you can turn the distributor to where it gets the highest vacuum and then back it down 1 psi for the most efficient timing. Then check timing mark to make sure it's in a good range. That sound about right or is there a better way for a novice to know the best timing for the vehicle?
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