GILBERT CHEVROLET - GMPP GEN VI 427/454CI BIG-BLOCK BARE BLOCK
     This is a special GM Chevrolet Gen VI Big-Block bare block with 4.25” cylinder bores with four-bolt main bearing caps used for both 427ci and 454ci engines.
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 GEN VI 427/454CI BARE BLOCK DESCRIPTION
Gen VI Bare Block 427/454ci Picture
P/N 12561353
     This is a special Gen VI bare cast iron block with 4.25” cylinder bores with four-bolt main bearing caps. It has a machined fuel pump pad, one-piece rear main seal design and standard 454 deck height.
     Technical Note: The maximum cylinder bore is 4.25” plus .060” O.S. and will require the “Gen V/GenVI” design one-piece oil pan. Casting P/N 12550313 [Old P/N 12550307]

 GEN VI 427/454CI BARE BLOCK SPECIFICATIONS
Block Material:
Cylinder Wall Type:
Deck Height:
Cylinder Bore Range:
Cap Bolts:
Cap Material:
Crankshaft Journal Dia.:
Oil Sump Type:
Crankshaft Seal:
Design Max. Stroke:
Weight (bare):
Intended Usage:
Fuel Pump Boss:
 Cast Iron
Non-Siamesed
9.800”
4.250-4.310”
Straight, 4 Bolt
Cast Iron
2.75”
Wet
1 Piece
4.600”
N/A
Street
Has Fuel Pump Boss
Non-Standard Parts Required Special Features:
 Production Style with Fuel Pump Boss & Has 1 Piece Rear Main Seal.