This powerful big block engine has the following modifications: ported/milled cylinder head, stainless steel valves (stock size), retainer/keeper set, lash caps, chrome moly pushrods, 1.3 ratio roller rocker arms, valve cover spacer, 55lb valve springs, billet rod, agk racing camshaft, big Mikuni carb, manifold with pulse fitting, UNI air filter, billet flywheel & supersnake header. These motors produce awesome power! The horsepower of these engines will vary from 30hp to nearly 40hp depending on how much compression we put into the engine and what cam we use.