[W126 Coupe] HEI

[Nathan Goodlet]

What tune ups? 
What could you possibly do to tune a 560 up?  you can't adjust the timing, there are no points, unless you have valve guide seals leaking the plugs should last forever. 
Both 560 and 500 are Capacitive Discharge Ignition and toss a signal of over 300 volts into the coil to initiate the spark. How HE do you want?
I have an MSD 6A and MSD coil, but the factory coil could have taken the power, the voltage isn't much higher but the duration is much longer so the totat current is a lot higher, and I use stock cap and rotor, so 3 of the 4 stock resistances are in place, I use "spiral core" wires to replace the plug boot resistance and nonresistor plugs. Haven't had any problem with overheating the distrubutor coil wire contact like I expected. Been about 3 years like that.

PS don't ever get shocked by an MSD system. 
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