Dart Big M Block, 4.610” Bore, .904 Bushed Lifter Bores, 55mm Cam Bore, Lunati Signature Crank 20/20, 4.750” Stroke 4340, Brand New Callies Compstar Connecting Rods with ARP L-19 bolts, Diamond Gas Ported Pistons for 12 and 20 degree heads, Professionally Freshened with New Total Seal Rings, Will Make an Excellent Pump Gas Motor with SR20 or BRX Heads at about 11–1 Compression.