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.
The Shelby block offers these premium performance features:
Deep lifter valley reinforcing webs combined with thick oil pan rails and main webs maximize block strength.
Thick 0.750-inch deck delivers the foundation needed for maximum head gasket sealing and retention.
Priority main oiling system. With the oil gallery raised adjacent to the camshaft bore, oil flow is directed to main bearings first, before going to the cam bearing. Crank life is maximized. .
Shelby's FE alloy block delivers superior bottom end stability at high rpm.
Shelby 427 FE Aluminum Block Technical Features:
Block Material AA356,T6 aluminum Blocks is CNC machined
Deck Height 10.150-inch
Deck Thickness 0.750-inch
Cylinder bore range 4.250-inch,std., Big Bore option 4.375
Maximum Stroke 4.375-inch
Displacements up to 526 cubic inches
Cylinder sleeve Centrifugally cast ductile iron
Cylinder wall Siamese with dry liners
Main bearing cap Steel or 7075 Heat treated billet aluminum
Main bearing cap bolt
configuration studs;4cross bolts on 2-3-4 mains
Main journal diameter 2.942-inch
oil sump Accommodates wet or dry sump oiling systems
Head stud diameter 0.500-inch
Bare block weight 125 pounds, approximately
