Fully redesigned, the Shelby 427 Alloy FE block is 45 percent lighter, yet stronger than the factory cast iron version. It retains original factory engine mounting bosses and bell housing bolt pattern, making it a bolt-in replacement for 390/427/428 cast iron Fe blocks. The Shelby FE block is fully CNC machined and comes ready for engine assembly.
The Shelby block offers these premium performance features:
This is accomplished by:
Centrifugally cast duplicate iron. cylinder sleeves are fitted in the block, with an interference step fit that creates precise, non shift sleeves positioning. Cylinder walls are stained and revised cooling passages make street or race track cooling problems a thing of the past.
The block requires special Shelby head studs, available separately. Unlike a stock block, where the head bolt threads start at the deck surface, the Shelby stud threads are positioned adjacent to the cylinder bore bottom. This configuration delivers maximum gasket seal/retention and minimum cylinder bore distortion when the head is torqued to the block.
Shelby 427 FE Aluminum Block Technical Features
|Block Material||A356,T6 aluminum Blocks is CNC machined|
|Cylinder bore range||4.250-inch,std.,to special order 4.440-inch|
|Displacements up to||an easy 525 cubic inches|
|Cylinder sleeve||Centrifugally cast ductile iron|
|Cylinder wall||Siamese with dry liners|
|Main bearing cap||Billet steel|
|Main bearing cap bolt configuration||studs;4cross bolts on 2-3-4 mains|
|oil sump||Accommodates wet or dry sump oiling systems|
|Head stud diameter||0.500-inch|
|Bare block weight||125 pounds, approximately|
|Horsepower range||1,500 plus|
Shelby Fe Crankshafts, Dampers and Flywheels
Billet steel crankshafts offer maximum performance durability and are available in strokes up to 4500-inch. main journal diameter is standard FE2.79 inch and rod journals are 2.200 inches.
in addition, street crankshaft clamper spaces are available for billet or factory FE cranks. For street use, a 427 style crank damper uses a steel hub bonded to a steel inertia ring. In race applications, a SFI approved small dia. unit is offered. Timing marks are etched for accuracy.