do it for blind timing,, works fantastic on engines with lower rpms settings and shorter timing curves.
Problem is... you optimized the engine at that rpm and with no load on it.
again works well on simply low rpm engines, not worth a darn on any wide rpm or heavy load changing engine, or especially with overlap on a big cam.. that changes flow completely at higher rpms.. Will usually not give correct setting for these engines and cause them to run hot and retarded.
Again,, not bad for lower performance low rpm engines.. Especially good if no timing marks or blind timing. Will always get you into the ball park for these engines. Hopefully you can see where is works well and where is works not so well.
The vacuum gauge was a huge tool up till '65 or so when the emissions started over-riding optimum vacuum settings and vacuum timing. pcv valves started the demise, lean jets pretty much killed it... no timing advance till in high gear in 69 or so was the final nail. Day of 21 to 23?? lbs is a memory. long live the queen.
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