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Jim, i guess it could be poor valve adjustment.... It's got to be worth running cleaner through there and get them adjusted.
But if those are track miles, remember a full 24hr race at Le mans is only around 2500 miles, so you could be due a top end rebuild again anyway?
What type of exhaust valve guides did you use on the rebuild?
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Jonathan.
87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan 
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