Specifically designed for 602 Crate GM HEI distributor - this high-end kit will lock out the mechanical and vacuum advance mechanisms and allow you to more accurately set timing.

Locking the distributor insures the ignition timing stays consistent at all times making for a better performing engine.

To make sure that you have proper rotor phasing, you must change BOTH components. There's no other adjustments needed other than setting your ignition timing. Lockout plates will have a performance gain when the engine is under 4000 RPM; like restarts and corner exit.

Unlike cheap alternatives, these components are designed from high quality, durable aluminum for moving parts and will maintain proper rotor phasing. It is made from 2 different commercial parts and repackaged because we felt this Vac Advance plate and separate Mechanical Plate provided the best, most consistent and correct results.

Some Cheaper lockout plates sometimes require modifications to work properly (like drilling holes which could be off). Some other kits are made of stamped metal which is cheap and soft. They wear out and are inaccurate. Testing showed timing jumps of 4 Degrees on cheaper plates and some would wear out quickly. Most importantly, we use these because we don’t want to risk ruining a rotor and and losing a race night.

Recently, KIllerCrate worked directly with DIRTcar so these lock out plates are now legal in the Northeast DIRTcar Series. Check your local rule set to insure that are legal at your track. A DIRTcar Bulletin went out on May 8, 2019 that read:

Only Stock OEM distributors will be permitted. The Distributor must maintain the factory mechanical advance curve to stock OEM specifications. ALterations and/or adjustment will not be permitted with the exception of, lock plates may be added to the mechanical and vacuum distributor advance system. When both plates are added, mechanical weights and springs are to be removed along with the vacuum advance canister.

NOTE: Top Bars take a beating and should be changed once per season.

Instructions:

• Remove Distributor cap and rotor.
• Unplug the pickup coil from the module so you have more room to work and slip the vacuum lock out into place. Remember to plug it back in when complete.
• Remove the springs, weights and 2 small e-clips from the center mechanism.
• With e-clips out - remove the center mechanism
• Install the mechanical lock-out plate with the red dot up
• Reinstall 2 e-clips back on the center posts only
• Remove the factory vacuum advance
• Slip the vacuum lock-out plate under the pick up coil hooking the pin to the coil.
• Reinstall the screws
• IMPORTANT: Timing Must be RESET to total timing.

Tip: Engines with lockout plates start harder when hot. Therefore if it is HOT, spin the engine and then hit the ignition switch.