383 with the good thick casting 010 block. It has Scat bottom end Mahle flat top pistons. Dart 180cc 49cc heads, scorpion aluminum roller rockers, custom lunati flat tappet cam, kevco 8 quart oil pan. It comes with aluminum water pump and pulleys. This motor has about 4 races on it very strong bottom end and very respectable top end as well. 256-490-4780.. $4500 OBO