Thread: Ford 428 Cobra Jet Exhaust Backfire / Now 85 Pound compression - all 8 Cylinders

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Due to a slipped Harmonic Balancer it backfired extremely hard. Trashed both mufflers. All valves operating, timing chain is chain is OK. Any idea what could cause the compression issue. Ran perfectly before. Stock engine.

iv`e had balancers explode on my 351 with no adverse affects on anything else .. kinda odd you feel it killed your compression .. have you fixed it and ran it since ?

cam timing issue----------sheared crank key, Cam dowel pin(most likely) just plain put together wrong chain timing-----------