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Chevy Big-block v-8
Deck Height Diagram
Engine Blocks
19170538 NEW
427/454 Bare Block (not shown)
• New casting incorporating the best designs of Mark IV
and Gen VI
• Production type cast-iron 4-bolt block
• 4.25" finished bore
• 4.31" max bore (non-siamese bore)
• Machined fuel pump pad
• New water jackets for use with Mark IV or Gen VI heads
• Revised oiling to allow for bigger cam bearings/cam lift
• Bolt boss (not machined) added near distributor
hole like 8.1L
• Can be drilled for use with 10-bolt front timing cover
• Additional clearance added for roller timing chains
• Auxiliary oil pressure line added to front of block
• Racing style oil filter cast feature with added oil
pressure port
• Additional boss for manual transmission clutch
pivot (machined)
• Additional material added around lifter bosses
NEW!
A 502 Mark IV/Gen VI Bare Block (front)
NEW!
Bowtie Sportsman Block (front)
B
Bowtie Sportsman Blocks
Big-Blocks with big power are what you get when you select a GM
Performance Parts Bowtie Sportsman Block for your drag racing or
extreme street-performance application. These blocks comprise a
full line of high-quality, precision-machined components based on
performance-proven GM designs. The extensive lineup of blocks
makes choosing the perfect block easy—and our quality and precision
machining is second to none.
The blocks are CNC-machined, an automated process that
guarantees precise tolerances. There are no approximations on
these blocks —they’re exactly right, which is critical to obtaining
maximum performance. GM Performance Parts offers more CNCmachined
blocks than anyone.
The highest-quality materials are used to cast GM Performance
Parts Sportsman Bowtie Blocks. They are also available as tall
decks, allowing you to make more cubic inches with larger-stroke
crankshafts. These blocks can easily be bored and stroked to
500-or-more cubic inches. They can be fitted with one-piece or twopiece
crankshaft seals for less chance of oil leaks (one-piece seals)
or more aftermarket components attachments (two-piece seals).
The Bowtie Sportsman Blocks are available with splayed main
caps, which have additional material holding the crankshaft in
place. The caps are splayed at 16 degrees. GM Performance Parts
uses splayed main caps throughout the entire line of performancebuilt
Big-Blocks.
GM Performance Parts Bowtie Sportsman Blocks are ideal for drag
racers or street machines where the goal is 800 horsepower and
long-lasting reliability.
Bowtie Sportsman Block Technical Notes:
• Available in short deck (9.800") or tall deck (10.200")
configurations
• Blocks have clearance for 4.500" stroke crankshafts
• CNC-machined to +/- .001" tolerance
• Siamese cylinder bores
• Bore finishes are ready to hone to size
• Machined for mechanical fuel pump
• Machined for hydraulic roller and flat tappets
• Nodular iron 4-bolt main caps splayed 16° on the three
center mains
• Priority main oiling system
• Blocks with a 1-Piece Rear Main Seal use the 6-bolt,
Gen VI-style front cover (P/N 10230954) and Gen VI-style oil pan
• Blocks with a 2-Piece Rear Main Seal use the 10-bolt,
Mark IV-style front cover and Mark IV-style oil pan
Chevy BIG-block v-8
A. 19170540 NEW
502 Mark IV/Gen VI Bare Block
• New casting incorporating the best designs of Mark IV
and Gen VI
• Production type cast-iron 4-bolt block
• Improved main bearing bulkheads—Bowtie block
style bulkhead
• Clearanced for bigger strokes
• 4.466" finished bore
• 4.500" max bore (siamese)
• Fuel pump pad has been added/machined
• New water jackets for use with Mark IV or Gen VI heads
• Revised oiling to allow for bigger cam bearings/cam lift
• Bolt boss (machined) added near distributor hole like 8.1L
• Can be drilled for use with 10-bolt front timing cover
• Additional clearance added for roller timing chains
• Auxiliary oil pressure line added to front of block
• Racing-style oil filter cast feature with added oil
pressure port
• Two bosses added for manual transmission clutch
pivot (machined)
• Additional material added around lifter bosses
A 502 Mark IV/Gen VI Bare Block (bottom)
NEW!
Bowtie Sportsman Block (rear)
B
See chart on page 231 for complete specifications.
Standard Deck Sportsman Blocks
B. 19212192
Standard Deck Bowtie Sportsman Block
• 1-Piece Rear Main Seal
• CNC-machined cast-iron 4-bolt block
• 4.494" finished bore
• 4.600" max bore
• Tested to 800 horsepower!
C. 19212191
Standard Deck Bowtie Sportsman Block
• 2-Piece Rear Main Seal
• CNC-machined cast-iron 4-bolt block
• 4.494" finished bore
• 4.600" max bore
• Tested to 800 horsepower!
A
502 Mark IV/Gen VI Bare Block (rear)
Top—Splayed Main Cap Bottom
Machined Bottom (close-up)
C
2-Piece Rear Main
C
232 Buy online at www.gmperformanceparts.com
Available for purchase online at
gmperformanceparts.com
233