[Jim Brierley]

I race the Model B engines, and use a little more clearance than for touring. I have gone 153 MPH on a full-babbitt engine, B rods. I'm still running the same block and C crank on the same babbitt mains. I use .0025-.003" clearance and full pressure oiling. Red-line is 6,000 RPM, using a Cook OHV cylinder head. I believe in using Plastigage. To each his own!