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Does anyone out there run an O-290-D2 in a 235?  My question relates to

all of the conflicting information I get about compression ratio and

fuel.  I am told that the compression should be raised to 9:1 in order

to burn 100LL without the valve problems.  Has anyone heard of this

happening?  The engine shop that is redoing my motor has told me that

this is untrue, and about the only thing I would have to stay on top of

is the plugs (every 50 hours or so).



Brock Brinkerhoff

290DM