You can price and order genuine Chevrolet and GM Performance Parts and engine parts from eBay or directly from your local Chevy or GM Performance Parts dealer counter. 12371172 - LT4 Crate Engine, 350 Gen.II long block, 4 bolt main caps, nodular cast iron crank with one piece rear seal,...
But if the flywheel doesn't have a ring gear, clamp the Vise Grips on the PTO end of the crankshaft, install a long bolt in one of the bolt holes on the PTO end of the block, and allow the Vise Grips to bump against the bolt to loosen or torque the flywheel nut or bolt. As ...