ATK High Performance GM Marine 383 Stroker Mercruiser MPI Base 380 HP Long Block Crate Engines

ATK high performance GM marine 383 stroker Mercruiser MPI base 380 HP long block crate engines are remanufactured version of the Mercruiser 377CI MPFI engine with a 4.030 in. bore (383ci). It has the upgraded 4340 forged crankshaft and forged pistons along with the Mercruiser camshaft installed. It is to be used with the Mercruiser MPI system, aftermarket EFI or a carburetor conversion. This engine will make 405HP at the crankshaft and 380HP at the prop which is how Mercruiser rated their power ratings. Features: • OE roller block 4 bolt main with 1pc seal • 3.750 in. stroke • Scat 4340 forged external balance rear of crank/internal balance front of the crank • Scat 4340 forged I beam with ARP 8740 bolts • Forged 9.1:1` compression pistons • Hydraulic roller camshaft • Cam Specs: 215/220 @50 .457in/.474ex 112LSA • Single roller timing chain • Dart Vortec cast iron 67cc/165cc 2.02/1.60 • Stamped steel 1.5 rockers • Rear sump 5 qt. oil pan • Melling oil pump • Pioneer external balance 168 tooth (with Scat kit) Show Less