| Diagram | Fig. 8 — TIMING COVER AND CONTACT BREAKER · ref 8 |
| Subsystem | engine bottom |
| Listed in parts books | 1969 |
Auto-Advance Unit (54419340)
An auto-advance unit for the ignition timing mechanism, housed behind the timing cover.
This is an auto-advance unit, part number 99-0771, cross-referenced in the catalog under 54419340. It shows up in the timing cover and contact breaker section of the parts book, which is where you'd expect it — this is the mechanism that lives behind the timing cover and adjusts ignition timing as engine speed changes, advancing the spark as revs come up.
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The catalog record we have on this one is thin — a single listing tied to 1969. If you're matching this against what's currently in your timing chest, pull the old unit and compare before you order, since auto-advance units can vary in details not spelled out in our records.
Call the shop if you want us to talk through fitment before you commit — better to check than guess on a part that sits this deep in the ignition timing train.
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