Here's your affordable yet durable way to change out the springs with heads on the engine. This heavy-duty, stud-style compressor will easily compress any spring. Works with Chevy SB and BB, Ford, and Pontiac engines.Proform Engine Valve Spring Compressor 66848Specifications: Tool Type Valve Spring Compressors Category Spring Compressor Feature/Benefit Here's your affordable yet durable way to change out the springs with heads on the engine. Description_ABR Spring Tool Description_SHO Spring Compressor Description_INV Economy Valve Spring Compressor Description_DEF Engine Valve Spring Compressor Description_ASC Engine Valve Spring Compressor Description_ASC Economy Model Description_ASC For Stud Mount Type Use Description_LAB Engine Valve Spring Compressor Description_LAB Economy Model Description_LAB For Stud Mount Type Use Description_DES Engine Valve Spring Compressor Description_DES Economy Model Description_DES For Stud Mount Type Use Description_EXT Engine Valve Spring Compressor Description_EXT Economy Model Description_EXT For Stud Mount Type Use Description_EXT Fits 3/8 Inch and 7/16 Inch Studs Description_EXT Made From High-Quality Steel Description_EXT Black Finish Description_EXT Sold Individually Description_MKT Here's your affordable yet durable way to change out the springs with heads on the engine. This heavy-duty, stud-style compressor will easily compress any spring. Works with Chevy SB and BB, Ford, and Pontiac engines.