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Vehicle Info NeededBow Tie Sportsman Engine Block (1-Piece Rear Main Seal), Standard Deck
Ships on 11/06/2026Free shipping
Lowest Price Guarantee- Bow Tie Sportsman Engine Block
- Big Block Chevy (1-Piece Rear Main Seal)
- Standard Deck: 9.800''
- 4.494'' Finish Bore (4.600'' Maximum)
- Nodular Iron 4-Bolt Main
- Main Bolts: 16°
- Bore Range: 4.494' to 4.600'
- Fuel Pump Boss: Yes
- Cylinder Wall: Siamese
- Crankshaft Journal Size: 2.750'
- Oiling System Configuration: Wet
- Maximum Crankshaft Stroke: 4.500'
- Block Weight: 258 pounds
- Maximum Tested Horsepower: 800 HP
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
For drag racing & extreme street machines, these blocks are cast from the best iron and CNC-machined (an automated process that ensures precision) to achieve maximum performance. They offer a standard or tall deck; tall decks allow cubic inches to be increased using a larger crankshaft. Bow Tie Sportsman Blocks can be bored and stroked to 500+ cubic inches, and they have 16° splayed main caps with extra material to secure the crankshaft. Blocks can be fitted with a 1-piece seal to reduce the risk of oil leaks or 2-piece seal to accommodate more components.
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Specifications
- Cast Iron Block
- CNC-machined to +/- .001'' tolerances
- Standard deck (9.800'') or tall deck (10.200'')
- Nodular iron 4-bolt main caps splayed 16° on the three center mains
- Clearance for 4.500'' stroke crankshaft
- Siamese cylinder bores
- Bore finishes are ready to hone to size
- Priority main oiling system
- Machined for mechanical fuel pump, hydraulic roller, and flat tappets
- Blocks with 1-piece rear main seal use the Gen VI-style 6-bolt front cover (#809-10230954) and Gen VI-style oil pan
- Blocks with 2-piece rear main seal use the Mark IV-style 10-bolt front cover and Mark IV-style oil pan
