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Old 02-01-2006, 12:12 AM
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Unilite to HEI conversion

I just ordered a new HEI vacuum advance distributor, its currently being shipped to my house. I have the Mallory Uni-lite currently on the vehicle (SB350 chevy). I was told it was a pretty easy conversion, has anyone done this before? Are the plug-in ports interchangeable? Or will I have to re-wire and buy a different connector to hook up to the HEI unit?

Any help appreciated.

Thanks
7dcrzr

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Old 02-01-2006, 09:28 AM
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The ultilite uses a remote coil & a ballis resister, the hei needs a 12v keyed wire ran to the cap.
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Old 02-01-2006, 11:10 AM
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OK, you will need to feed the HEI a full battery voltage, in both start and run key positions.

If you have a stock type vehicle, look on the fuse block and find the IGN or IGNITION terminal. Use a volt meter to confirm battery vlots on that trerm in key positions run and start. When confirmed, use a 12 guage wire from it, through a convienient hole with grommet in the firewall, to the BATT term on the dist cap. You can get the HEI term and plastic from ANY GM dealer from their electrical connectors book.

If you have a specialty fuse box, then there may be a full volts ignition terminal to use, hot in both run and start, use this terminal for power to the BATT term on the dist cap.

If you have a wire to the coilm in place now that has a porcelain balast resistor in it, remove the resistor and chack for full battwery volts in start and run. If OK, change the end of the wire using the stock HEI terminal and plastic form the dealer.

If yu don't get battery volts in one of the key positions with the fuse box, post back here and we'll troubleshoot it further.

BTW, IF the dist you ordered is a PRO-COMP unit, I STRONGLY suggest you return it and get a good HEI, not one of those nightmares.
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Old 02-01-2006, 11:15 AM
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OK, you will need to feed the HEI a full battery voltage, in both start and run key positions.

If you have a stock type vehicle, look on the fuse block and find the IGN or IGNITION terminal. Use a volt meter to confirm battery vlots on that trerm in key positions run and start. When confirmed, use a 12 guage wire from it, through a convienient hole with grommet in the firewall, to the BATT term on the dist cap. You can get the HEI term and plastic from ANY GM dealer from their electrical connectors book.

If you have a specialty fuse box, then there may be a full volts ignition terminal to use, hot in both run and start, use this terminal for power to the BATT term on the dist cap.

If you have a wire to the coilm in place now that has a porcelain balast resistor in it, remove the resistor and chack for full battwery volts in start and run. If OK, change the end of the wire using the stock HEI terminal and plastic form the dealer.

If yu don't get battery volts in one of the key positions with the fuse blox, post back here and we'll troubleshoot it further.
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