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Head ID on unknown 460
The engine was recovered from an '84 3/4t, had reman tag so don't know origin. If the heads are '84 (low comp?) that will mean I need more initial spark advance-- currently set at 0 deg because this engine is mounted in an antique pusher bus, and can't hear it ping. Anyone know how to ID the heads, or failing that, how much spark I dare give it? The distributor is points equipt off early Lincoln, no carbon inside. Bus weighs 25k, need everything the engine can do.
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