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In case anyone is following this-another possible issue before I order pistons is the distance of the ring package from the piston crown due to possible interference from notches in the cylinder wall to clear the intake valve since i'm using 5.6 heads. With the 4.5 bore the 5.6 intake valve just touches the cylinder wall. I don't think the minor bore increase will provide the needed .060" clearance, so notches are imminent. I have calculated the 5.6 bore of 96.5 provides about .080" more of clearance on each side.
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 Tony H
W111 280SE 3.5 Coupe
Manual transmission
Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT
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