Re: Timing Question- How much advance is too much?
Or, instead of welding the slot you can just slip a piece(s) of vacuum tubing over the post that is in the slot. I used to know how much tubing wall thicknes was needed to change 1* of timing, but it's been too long ago. Easy to calculate, though. The slot number is the number of distributor degrees, X2 gives you crank degrees. Measure the length of the slot minus the width of the post and you can divide to find how many thousandths of an inch of slot equals 1* advance. On my own car I needed a piece of vacuum tube covered with a piece of heatshrink tubing to get it dialed in just right.
70 Maverick Grabber, 5.0 (Perf. RPM heads, RPM intake, FiTech EFI, Comp XE266HR roller cam, EDIS/Megajolt ignition, long headers), T5Z w/Steeda TriAx shifter, 9" Trac Loc w/3.89:1, 31 spline axles.