Ignition timing is typically split into three types. The first is initial timing—that is, the amount of spark lead that is set using a timing light (aimed at the harmonic balancer) with the engine at ...

At some point in the mid 1970s or so, GM (with Delco Remy) came up with a new electronic ignition system known as HEI or High Energy Ignition. We've touted this as an upgrade for many engines in ...

If there's already a distributor in the engine, the first step is to mark the position of the rotor so you can make sure to insert the new distributor in the same position. We like to turn the ...

The GM HEI (High Energy Ignition) electronic distributors have a reputation for hassle-free performance. Used in GM rigs from its inception in 1974, the famed HEI can be retrofitted to almost any GM ...