Recommended press fitting for valve seat inserts in aluminum cylinder heads:

OD insert 30 – 40 mm: 0.15 mm / 0.0059″

OD insert 40 – 50 mm: 0.18 mm / 0.0071″


Spindle speed for cutting a seat pocket in aluminum cylinder heads: 400 – 600 rpm

It’s recommended NOT to freeze (f.i. with liquid nitrogen) the sintered valve seat inserts before installation.

The valve seats are to be pressed in with a flat and square seat driver tool. The valve seat is inserted with the radius side down.


Source: DuraBond

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