ICE Ignition — Frequently Asked Questions

Use non-resistor plugs with ICE systems. Resistor plugs add ~5k ohms, reducing spark energy and increasing the risk of misfire or cross-fire, especially in high-pressure or LPG/E85 applications.

Yes. ICE offers Sniper/EFI-compatible distributors and ignition components designed to work with Holley Sniper systems.

Each switch shows the first two digits of the selected limit (for example, "58" = 5800 rpm) with 100-rpm steps from 1000 to 10,900 rpm.

Apply 12V to the control’s white wire to activate the 2-Step. The engine is limited to the rpm set on the switches until deactivated.

It may or may not light at key-on depending on distributor tooth position. It must flash during cranking, then appear solid once running.

Most modern aftermarket tachs accept the square-wave tach output. They can also read from coil negative as an alternative.

Most factory tachs won’t recognise the square-wave output; connect the factory tach to coil negative instead. Older OEM tachs may be less accurate.

No. CNP coils aren’t intended for single-coil use and will overheat, causing failure. Using the LS1 Smart Coil as a single coil voids warranty.

Use the official dwell chart supplied by ICE for LS1 coils (refer to the downloadable guide for exact values).

High resistance in leads/plugs (often resistor plugs) or incorrect EFI phasing. Fix faulty leads/plugs and verify ECU reference angle/edge.

Recommended with 10-Amp systems to reduce cross-fire risk (more spacing between towers). Optional with 7-Amp systems if space allows.

Easier starting, stronger idle vacuum, better throttle response, improved low/mid-range power, reduced detonation risk, 3-year warranty, and local support.

Minimum alternator voltage (~13.8–14.8V). Best results at ~16V using a booster to maintain strong ignition output under load.

Use cam duration @0.050" as a guide (e.g., 190–210° → ~12–16° BTDC; 210–230° → ~16–20° BTDC; larger cams may need more, or locked timing). Tune for the combo.

Yes. ICE uses a roller bearing top and extra lower bush, so it doesn’t rely on the block for support and fits early/late Cleveland blocks.

Naturally aspirated: ~0.030–0.040" (start small, increase if stable). Boosted/nitrous/turbo: ~0.020–0.030" (start smaller and open as safe).

No. Keep coils in the engine bay and control modules in the cabin. The firewall helps shield electrical noise; cabin-mounted coils can cause issues.

No. Mount modules away from water/dust. Long harnesses allow cabin mounting (e.g., under dash/glove box).

Usually not required; it can aggravate distributor-gear wear and may void gear warranty. Consider the whole oiling system before using one.

Cast flat-tappet cams: SG iron gear. Steel roller cams: SI bronze gear. Cast roller cams: treated steel gear. Never use a steel gear on a steel roller cam.

Run the battery negative directly to the engine block as a single cable. Ground ignition controls directly to the block via the shortest path.