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64 Ford with 223 I6 problem
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Posted by dhermesc on July 23, 2003 at 06:22:21 from (65.149.3.225):
Bit long but bear with me. I have a 64 Ford PU with a 223 I6 that backfires occassionally when under a heavy lug. The compression is low (about 85 to 95 PSI on all cylinders) and vacuum is almost nonexistant. The compression is low because the head was replaced with a head from an older engine (57?) that had larger combustion chambers and the engine does have some wear. I thought my back firing was due to the engine being fuel starved but now I think it mught be the vacuum advance isn't working do to the extremely low vacuum. I have not been able to find any manifold intake leaks so I have know idea why it is so low. Any thoughts?
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