Too much propane will remove the head bolts the hard way -- straight out up, with thread from block included.

There is a lovely 300CD sitting about three miles from me that had just this happen when someone tried to start it (weak engine) with "extra" boost from acetylene. Pretty sad end to a nice car that really needed a starter.....!

If you want more power, buy a bigger engine. Leave the propane trick to people who have the money to replace the engine often!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!