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Ed Rinke Performance

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Bowtie Sportsman Blocks

Bowtie Sportsman Blocks
Big-Blocks with big power are what you get when you select a Chevrolet
Performance Bowtie Sportsman Block for your drag racing or extreme streetperformance
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. Chevrolet Performance
offers more CNC-machined blocks than anyone.
The highest-quality materials are used to cast our 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 two-piece
crankshaft seals for a smaller 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. Chevrolet Performance uses splayed main caps throughout
the entire line of performance-built Big-Blocks.
Chevrolet Performance 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
See chart on page 293 for complete specifications.