No, HEI came in because of increasing federal emission demands to burn cleaner, with this you get hotter spark, wider plug gaps that lead to longer life/less problematic ignition components to just name a few

Last edited by sstock; 10/05/2019 4:40 PM.
1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration