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Fully
redesigned, the Shelby 427 Alloy FE block is 45% lighter,
yet stronger than the factory cast iron version. It
retains the 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
s fully CNC machined and comes ready for engine assembly.
| 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 galley raised
adjacent to the camshaft bore, oil flow is directed
to main bearings first, before going to the
cam bearings. Crank life is maximized.
- Strong
enough to support over 1500 horsepower outputs.
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| Shelby's
FE alloy block delivers superior bottom end stability
at high rpm. This is accomplished by: |
- Extended
skirt design.
- 2,
3, 4 main caps are cross bolted with 4 cross
bolts. Main caps are billet steel and cap alignment
is further enhanced by integral dowel sections
in the main studs.
- Steel
caps allow moderate bearing clearances for cold
starts.
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Centrifugally
cast ductile iron cylinder sleeves are fitted in the
block, with an interference step fit that creates precise,
non-shift sleeve positioning. Cylinder walls are siamesed
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 studs
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.
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