Re: Engine has small tremble
IMO, after reviewing the cam card, I believe he should not have degreed the cam. Plus, 12 degrees? This is a great amount.
Ibelieve the cam should have been installed straight up because it already has 4* advance ground into it. Lobe Separation Angle (LSA) is 110* ans Intake Lobe Center Line (ICL) is 106*. So any more advance, and its going to be a step or two above stock with the duration & LSA.
Plug in a vacuum gauge and see what the intake vacuum reading really is.
Your subtraction of timing, you dial in 30* and adjust for 0*, you have timed in for 30*. Now if you have 48* at cruise rpm, 48-30= 18*. But at what rpm?
Initial timing is taken with no centrifugal advance and no vacuum advance. Unplug the vacuum line, and idle down the engine to below 1,000 rpm. Measure timing.
Now, rev up engine to say 2500-3000 rpm, and measure timing. This will be centrifugal timing.
Now plug in vacuum hose and measure the change. this will be vacuum advance.
Vacuum 12* Total timing at 3000 rpm is 36* BTDC.
Once timing is straight, you can view the vacuum gauge and adjust mixture screws for max vacuum.
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