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Matt69olds

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Matt
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81
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GMC 1/2 ton
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455 Olds
I guess you can’t post more than 5 pics, so here is more valuable stuff!!!
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Autometer Phanton nitrous pressure. Includes the sending unit and harness. $100

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Autometer Ultra Lite 2 1/16 volt gauge $50


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MSD multi step 3 channel ignition controller. $75


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MSD shift lite $30

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Autometer Ultra lite 2 1/16 pyrometer with thermocoupler and harness $100
 

bucket

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The retard box has me curious. How is the timing retard activated and does it require an MSD ignition box or can it be used with stock HEI?
 

Matt69olds

Full Access Member
Joined
Jan 8, 2018
Posts
2,352
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3,600
Location
Central Indiana
First Name
Matt
Truck Year
81
Truck Model
GMC 1/2 ton
Engine Size
455 Olds
You need a ignition box. The retard box basically delays the ignition pulses based on what chips are installed. There are 3 trigger wires that retard timing by removing a ground. There is also a trigger wire for the start circuit. Connect that to the starter feed, whenever the engine is cranking it pulls 20 degrees of timing out. It’s great for engines that have locked ignition timing.

here is a link for the instructions


https://www.jegs.com/InstallationInstructions/100/121/121-8970.pdf
 

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