Is there greater spark plug gap with HEI distributor?
Getting hard to find now but the four banger cars have a shorter harness in the 70-80 models. Back in 1975 when GM started using HEI, they wanted plug gaps set at .060 till they found out it was hard on caps and rotors, as mentioned. They then changed their specs to .045. So as mentioned, .040-.045 is right on the money.
How do you replace a HEI distributor on a jeep?
Get the #1 piston to the top with the starter or by turning the engine over with a wrench. Remove the distributor and get the rotor pointed to #1 wire on the distributor cap. Replace the #1 spark plug and 12v lead to the distributor. If it backfires, it may be 180 degrees off.
What are the results of upgrading a jeep to GM Hei?
The greater power at the spark plug gap consistently ionizes the air across plug gaps of .045 to .060 inches. The most notable results of upgrading your stock Jeep to GM HEI include:
When did GM change spark plug gap to.045?
Back in 1975 when GM started using HEI, they wanted plug gaps set at .060 till they found out it was hard on caps and rotors, as mentioned. They then changed their specs to .045. So as mentioned, .040-.045 is right on the money.
What’s the difference between Hei spark plug gaps?
Well, we simply reduced the spark plug gaps back down to the original .045 sizing, and, MAGIC, LIGHT OF LIGHTS, NIRVANA, THE WARRANTEE COIL/HEI MODULE FILURES/PROBLEMS AND FAILURES STOPPED, and failure rates went back to the levels pre-giant gap.
Get the #1 piston to the top with the starter or by turning the engine over with a wrench. Remove the distributor and get the rotor pointed to #1 wire on the distributor cap. Replace the #1 spark plug and 12v lead to the distributor. If it backfires, it may be 180 degrees off.
The greater power at the spark plug gap consistently ionizes the air across plug gaps of .045 to .060 inches. The most notable results of upgrading your stock Jeep to GM HEI include:
Back in 1975 when GM started using HEI, they wanted plug gaps set at .060 till they found out it was hard on caps and rotors, as mentioned. They then changed their specs to .045. So as mentioned, .040-.045 is right on the money.