Sorry, GLM71240 is not available at this time and is being replaced by SIE18-5470.
Distributor Electronic Thunderbolt for Mercruiser V8 5.0 5.7 7.4 8.2 805185A37
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Part Number: SIE18-5470
Thunderbolt V8 Distributor used by Mercruiser on engines 1983 and newer. Uses a separate box that mounts on the distributor to control Ignition Timing. Fits: GM V-8 engines Replaces: 805185A37MERCURY MARINE