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Ford introduced its first straight-6 engine in 1906. The 300-cubic-inch, or 4.9-liter, straight-6 engine was added to Fords engine line in 1965. This engine is almost identical to the 3.9-liter engine except for its longer stroke, block dimensions and rotating assembly.
Engine Block
The crankshaft requires 65 foot-pounds of torque to bolt properly to the engine block. The cylinder head bolts to the engine block in three steps: first to 55 foot-pounds of torque, then to 65 foot-pounds, then to 80 foot-pounds. Wait about 15 minutes between each step to allow the bolts to stretch and settle. The oil-pan-to-engine-block bolts require 15 foot-pounds of torque to connect.
Crankshaft
The connecting rod joins to the crankshaft with 42 foot-pounds of torque. The flywheel-to-crankshaft bolts require 80 foot-pounds of torque. The vibration damper or hub bolts to the crankshaft with 140 foot-pounds.
Other Specifications
To prevent leaks, the drain plug must receive 22 foot-pounds of torque when joined to the oil pan. The engine mount bolts to the frame with 82 foot-pounds of torque. the intake manifold requires 27 foot-pounds and the exhaust manifold requires 30 foot-pounds to join to the cylinder head.
