Distributors

Start with your current distributor and what you're running for ignition. Ready-to-Run and HEI distributors have a built-in module and need no external ignition box, so they're the simplest upgrade for a street build or a crate engine. Mechanical advance distributors are 2-wire units that run with a CD ignition box like the Go Spark CDI. EFI/EST distributors hand ignition timing to your FiTech ECU. Pick based on whether you want the module built in, you're running a CD box, or you want the ECU controlling spark.

Both are self-contained with a built-in module and a simple hookup. The HEI distributor uses a GM HEI 4-pin module with the coil built into the cap, the classic GM HEI system layout. The Ready-to-Run uses a built-in module with a separate external coil, which keeps the cap compact and lets you choose your coil. Both skip the external ignition box.

The Ready-to-Run, HEI, and mechanical advance distributors ship with an adjustable mechanical (centrifugal) advance curve set by swappable springs and stop bushings, plus a vacuum advance canister. You can tune the advance curve and set your initial timing to your engine and lock out the advance entirely for EFI or a crank trigger setup. The EFI/EST distributor runs with the advance locked out so the ECU controls timing.

Depends on the distributor. Ready-to-Run and HEI distributors have the module built in, so no external box is needed. The mechanical advance 2-wire distributors need a CD ignition box like the Go Spark CDI to fire. You'll also want a set of quality spark plug wires to finish the job. Check the part number for your application before ordering, and contact tech support if you need help matching a distributor to your ignition setup.

Yes. For ECU-controlled timing, the EFI/EST distributor lets the FiTech ECU run spark directly. The mechanical advance and dual-pickup distributors can also be locked out for full EFI timing control. If you want the distributor to handle the advance on its own, the Ready-to-Run and HEI units do that with no ECU timing control. Contact tech support if you need help matching a distributor to your fuel injection setup.