KB Performance Pistons Hypereutectic Flat Top Piston and Ring Set - 4.040 in Bore - 5/64 x 5/64 x 3/16 in Ring Grooves - Minus 7.00 cc - Small Block Chevy BHS549 9-3/4 to 7-3/4 in Adjustable

9-3/4 to 7-3/4 in Adjustable Height

Fits 1964 to 1973 Mustang

The other end features a 1/4"-20 female thread that accepts a standard air cleaner mounting stud

Under Seat Storage System is durable and chemical resistant

Replaces the stock rear rails in subframe equipped cars

KB Performance Pistons Hypereutectic Flat Top Piston and Ring Set - 4.040 in Bore - 5/64 x 5/64 x 3/16 in Ring Grooves - Minus 7.00 cc - Small Block Chevy BHS549 9-3/4 to 7-3/4 in AdjustableProduct Description: Piston and Rings Hypereutectic Flat Top 4. 040 in Bore 1. 433 in Compression Height 5 64 x 5 64 x 3 16 in Ring Grooves Minus 7. 00 cc Small Block Chevy Keith Black pistons have several important advantages over conventional alloy pistons. KB Hypereutectic Pistons high silicon content yields superior thermal and wear characteristics, greater strength, scuff and seizure protection, and resistance to cracking. High silicon content