1. 1960 Swarthmore Ave
Lakewood, New Jersey 08701
Phone: 732-905-3366
Fax: 732-905-3010
www.manleyperformance.com
Installation instructions for Subaru FA20 BRZ Grade A and B Platinum Series pistons.
Piston Sizing
Manley Subaru pistons are manufactured to provide DROP-IN installation and correspond to
the OEM Grade Range A or B bore sizes. Select the appropriate mix of grade range pistons for
your block’s requirements. The proper clearance is designed into each grade range. Do not
attempt to modify the piston to wall clearance by mis-matching the grade ranges. Corresponding
Grade A and B pistons will have a piston to wall clearance range of .0023”- .0031”.
Cylinder Wall Prep
Depending upon the mileage of your engine and the condition of the cylinder walls, you
may elect to leave the bores in their current condition or introduce some crosshatch with
an abrasive-ball brush hone.
Piston Rings
Included with these pistons are a set of
Total Seal piston rings. The top ring is an
AP steel configuration; the second is a
Napier profile to assist in oil control.
Both the top and second rings REQUIRE
GAPPING to the following specifications:
11-15 lbs. of boost: .018”-.020”
16-25 lbs. of boost: .022”-.024”
26+ lbs. of boost: .025”
Wrist Pins
These pistons come standard with Premium Chrome Moly 0.150” wall pins suitable for
moderate boost. It is highly recommended that 9310 alloy 0.210” wall wrist pins part no.
42551 be installed in high boost engines.
Thank you for choosing Manley Platinum Series Pistons!