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| 6 cyl Bristol cars Type 400 to 406 - restoration, repair, maintenance etc |
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Not sure if your questions were answered.
The engine has a hemi head with a single waist level cam achieved by having a set of push rods transfer across the head to the valves on the other side. 15/40 diesel grade should be OK. Bristol recommended 30 sae over 32 degrees. Most people use 20/50 |