For a crisper, smoother running engine, replace your stock HEI module with the Dyna-Mod.
The Dyna-Mod has more "electronic dwell" in it to provide more coil saturation time. The
additional saturation time allows the coil to produce a more intense spark. Our Street/Strip
and Racing D.U.I. Distributors require our 4-pin Dyna-Mod.