Re: Compression Test
The gasp sounds ignition related to me. As if you are temporarily losing spark because of a loose connection or intermittent short. E.g. comes and goes as things vibrate.
These things could cause it (among many others):
1. Points arm occasionally touching lower part of points block
2. Frayed wire from the upper distributor plate to lower plate
3. Modern distributor plate
4. Loose coil wires
5. Lose ignition switch wires
6. Failing ignition switch
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Ray White
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