The L98 was featured in such vehicles as the 1991 Chevrolet Corvette. That year, the engine had a bore of 4 inches and a stroke of 3.48 inches. Its 9.5-to-1 compression ratio allowed it to produce 245 horsepower and 340 foot-pounds of torque.
The cylinder head requires three steps executed in a helical sequence to attach properly with the engine block. The bolts torque first to 25 foot-pounds, then to 45 foot-pounds and then to 65 foot-pounds. For helical sequencing, begin torquing the bolts in the middle of the component and work outward from there in both directions so that the torque is applied evenly throughout the component. All of the cylinder head's bolts should be torqued to the first step before you move on to the second step, which should be performed in the exact same order as the first. Allow about 15 minutes to elapse between each step of the sequence so the bolts can stretch and settle.
The outer bolts of the crankshaft require 65 foot-pounds of torque to attach to the engine block. The rest of the crankshaft bolts torque first to 25 foot-pounds, then to 50 foot-pounds and then to 75 foot-pounds. The 11/32-inch bolts of the connecting rod require 35 foot-pounds of torque to bolt to the crankshaft, the 3/8-inch bolts require 45 foot-pounds and the 7/16-inch bolts require 75 foot-pounds. Both the flywheel and vibration damper bolt to the crankshaft with 60 foot-pounds of torque. The three bolts of the pulley require 30 foot-pounds of torque to attach to the crank.
The bell housing and engine block attach with 30 foot-pounds of torque. The carburetor-to-intake-manifold bolts require 7.5 foot-pounds of torque. The drain plug for the oil pan receives 20 foot-pounds of torque. The engine mount bolts to the engine block with 35 foot-pounds of torque. The intake manifold requires 33 foot-pounds and the exhaust manifold requires 20 foot-pounds on the outer bolts and 30 foot-pounds on the four inner bolts to attach to the cylinder head.