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| 6 cyl Bristol cars Type 400 to 406 - restoration, repair, maintenance etc |
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The 2 main possibilities are damaged or worn out rings/pistons , or, more simply, worn valve guides. Compression testing and video inspection will help clarify. If the engine was well rebuilt -bottom end done properly with crank reground, and bores not scored or worn out - just fitting a new set of modern, forged pistons isn't too enormous a job. Annoying, though.
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