Speed Pro Speed Pro Piston Rings 4.500" Bore File Fit 1/16 x 1/16 x 3/16" Thick - Standard Tension 39000510 New valve springs with larger

New valve springs with larger diameters require new retainers to handle the higher pressures developed by the springs

Outflows Stock Intake By - 16 Percent

Use a backup plate (700070) for installation through a sheet metal floor

1991-1996 Mercury Cougar

combined with an open flow corner

Speed Pro Speed Pro Piston Rings 4.500" Bore File Fit 1/16 x 1/16 x 3/16" Thick - Standard Tension 39000510 New valve springs with largerFace of top rings are coated with the latest generation Plasma Moly Plasma Moly ring face decreases friction and is highly resistant to scuffing Ensures dependable performance and superior service life Application specific design to ensure a perfect fit and correct operation for unsurpassed quality that you can trustFrom pistons to engine bearing components, Speed Pro offers an array of performance engine parts. You can rely on Speed Pro for industry