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Vacuum Gauge reading, can you help me interpet them?

1K views 2 replies 3 participants last post by  camaroguy_1967 
#1 ·
Tonight I went out and hooked up my new vacuum gauge to the back of the carb, I was reading about 19.5 inches after the engine came up to temp. I did notice that it would bounce slightly between 19 inches and 19.5 inches. I read somewhere that it should read steady and it if bounced around it could be timing or carb out of adjustment.. Which should I check first?

If I need to adjust the timing what the easiest way to do it with an HEI with out getting bit?


Regards
Mark:eek:
 
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