Speed Pro Hellfire Piston Rings 4.155" Bore File Fit 1/16 x 1/16 x 3/16" Thick - Standard Tension 500020155 Boost Retard Dial

Boost Retard Dial

Oversized Oval Head

800 modules

1970-1972 Ford Mustang Base CID 351 Naturally Aspirated GAS

Speed Pro Hellfire Piston Rings 4.155" Bore File Fit 1/16 x 1/16 x 3/16" Thick - Standard Tension 500020155 Boost Retard DialTop ring is an uncoated special hardened and tempered high strength material that withstands high heat a pressure without collapsing. Standard tension oil ring to provide maximum oil control 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