Thanks for the info. I didn't change the timing when I converted to LPG and it seemed fine, but had since seen it mentioned a few times in general comments about using LPG. So should I go with the Volvo handbook at 5 degrees BTDC?
The head wasn't skimmed - the timing belt somehow slipped. I had to replace the exhaust valves. I also need to adjust the valve clearances, two are a bit tight.
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