There room instances whereby OEM architecture is so an excellent that the lends itself to a broad variety of applications in ~ the high-performance aftermarket. Some an excellent examples room the Mustang II frontend, Corvair turbo mufflers, and the GM HEI distributor. The GM one-wire HEI distributor is the world"s simplest, many integral design ever introduced, and also thanks to a clear distributor cap from power Distributors it"s also the simplest to set initial timing. Because that those unfamiliar with the term, initial time is what demands to be done to an engine"s ignition system before the engine deserve to be began for the very first time.

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On those gearhead TV mirrors it"s always a huge anticipatory minute whether the engine will certainly fire increase or not, however in the real human being there"s never a inquiry if the job has actually been excellent right. The an initial step is to bring the engine to TDC (top dead center), but there"s a 50/50 shooting at obtaining the timing 180 levels out if a couple of checks aren"t put into place. Some choose to rely on removing the number 1 spark plug, and using a finger to feel for compression together the engine comes approximately TDC, and then there"s the method I believe is more absolute.


I prefer to eliminate the valve covering on the financial institution with the number 1 cylinder and establish the compression punch by see if the exhaust and also intake valves space closed in ~ TDC. Normally the location for number 1 ~ above a Ford and also Chevrolet engine room different, therefore the message right here is no issue which make of engine is in question always verify the location of number 1. The basics disputed in this article use to every internal burning engine ever before made.


There are several brands with GM-style HEI one-wire distributors top top the market, and also with varying levels of quality and also pricing. I"ve make the efforts the really cheap HEI distributors and think they"re great for installing into something one plan on selling the next day. My experience was the distributor cap and rotor disintegrated immediately, and when diagnosed they to be the source of a poor miss.


There"s no economic climate to be discovered in one unreliable component that will at some point fail. In the critical eight year I"ve installed four Performance Distributors DUI (Davis unified Ignition) HEI-style distributors right into my vehicles with complete satisfaction. I proved a horsepower boost for my 1979 C10 on the dyno, and made remarkable gains in fuel mileage.


The most recent installation to be last year right into my 1927 Ford track T with a 350. It"s the custom-build method that sets power Distributors ahead of the pack. V the electronic came specs handy i called and also specified I wanted the DUI calibrated v an breakthrough curve for 87-octane continuous unleaded gas. The engine fired appropriate up the very first time, and has run crisp without pinging ever before since.


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1. In enhancement to gift able to check out the rotor contact the number 1 plug in ~ TDC the clear lid DUI cap enables one to verify if the vacuum breakthrough works.


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2. Power Distributors clear lid comes finish with clear rotor, clean coil cap, and all hardware including the coil insulator and dielectric grease used on the coil insulator.


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3. The currently distributor wasn"t originally timed. The was removed by totally removing the distributor pinch clamp and lifting the distributor out.


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4. The time (degree) point out on the harmonic balancer to be made an ext visible through sanding v 220-grit sandpaper.


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5. The TDC (top dead center) mark suggested by a zero was made much more visible and also identified v a Sharpie marking. A bright paint color works even better.


6. Only the left bank valve cover requirements to gotten rid of to obtain sight of the valvetrain. To prevent an oil leak, a new valve covering gasket was installed. Execute not over-tighten.


7. At top dead facility the intake and exhaust valve will be closed. This is confirmed by checking (spinning) the pushrod will turn easily with slim resistance.


8. Time specs vary, yet a good rule of thumb is to set the time at 12 degrees advancement once the engine has actually started up because that the very first time. Use a time light v vacuum breakthrough disconnected.


9. Here"s the brass rotor arm as the meets up through the plug wire terminal ~ above the clean distributor cap. The number 1 terminal deserve to be collection at any point on the distributor cap.


10. Here"s the rotor eight perfectly aligned v the number 1 (plug wire) terminal top top the distributor cap. The initial time is collection in this position.


11. At some point I relocated number 1 clockwise one ar on the distributor cap because the distributor dropped into place easiest in ~ this position.

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12. Do a chart prefer this simplifies setup initial timing. Performance Distributor live wires are indicated on both ends, more simplifying the job.