Crank case pressure is a result of end gap size in the side
seal to
corner seal fit,
   the corner seal to apex seal fit and the
corner seal to corner seal
bore fit.

I start side seal end clearance at zero. Replace at .0025"
Use the old
solid corner seals, not the ones with the rubber plug. Use
the largest
breather hose diameter possible.

Lynn E. Hanover


I agree with Lynn Hanover on controlling Blow-By....  but I cut the corner
\seals for zero clearance a shown in the attachment to avoid locking
interference with the side seals.

Barry Bordes

Not a problem for a dry sump system. A little blow by helps.

I highly recommend it for any aircraft application as one can use a better
oil pump and up the oil pressure. Particularly with an aluminum front
housing where the stock oil pump is problematic.

Paul Lamar


Hey Barry B.

Could you show us the jig set-up you use to cut the corner seals like that? Thx!

Dan Gorsline.



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