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Vehicle Info NeededBow Tie Race Engine Block (2-Piece Rear Main Seal), Standard Deck
Ships on 11/06/2026Free shipping
Lowest Price Guarantee- Bow Tie Race Engine Block
- Big Block Chevy (2-Piece Rear Main Seal)
- Standard Deck: 9.800''
- Deck Height: 9.800'
- Fuel Pump Boss: Yes
- Cylinder Wall: Siamese
- Bore Range: 4.240' - 4.600'
- Main Bolts #: 4
- Main Bolt Degree: 16-Degree
- Main Cap Meterial: Steel
- Crankshaft Journal Size: 2.750'
- Oiling System Configuration: Wet
- Rear Main Seal Type: 2-Piece
- Maximum Crankshaft Stroke: 4.500'
- Block Weight: 281 lbs.
- Maximum Tested Horsepower: 1200 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
If you're looking to build a drag racing engine capable of producing 1200 horses or more, a Chevrolet Performance cast iron Bow Tie Race Block is your starting point. It is designed for engine builders who want to custom machine their blocks for specific racing applications. Toward that end, these premium castings have thick deck surfaces, improved oiling, improved coolant flow and splayed 4-bolt steel bearing caps. Everything is secured with premium fasteners. The combination of a Chevrolet Performance cast iron Bow Tie Race Block and your unique engine building skills will put you down the track ahead of the competition. Cast Iron Bow Tie Race Block Technical Notes
- Precision CNC-machining means +/- 0.001'' tolerances
- Standard deck (9.800'') or tall deck (10.200'')
- 4.240'' Finish Bore (4.600'' Maximum Bore, .250'' Minimum Wall Thickness)
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- A sonic bore check data sheet is provided with each block
- Lifter bores are .300'' taller than standard blocks
- Siamese cylinder bores
- Improved cooling around number 1 cylinder
- Accepts Mark IV or Gen V, Gen VI cylinder heads
- Use Gen V head gaskets with Mark IV and Gen V cylinder heads
- Use Gen VI head gaskets with Gen VI cylinder heads
- Requires Mark IV design 2-piece rear main seal oil pans
- Requires Mark IV design crankshafts
- Can use Mark IV and Gen V, Gen VI camshafts, timing sets, lifters and timing cover
(aftermarket belt drive timing covers may require clearancing) - Blind-tapped head bolt holes; extra inner head bolt bosses provided
- 4-bolt SAE 8620 main caps splayed 16° on the three center mains
- Priority main oiling wet sump system
- Provisions for dry sump oil line provided
- Honed camshaft and crankshaft bores
- 0.842'' lifter bores (maximum 1.06'') may be relocated
- Distributor gear clearance at bottom of number 8 cylinder bore should be checked
- Machined mechanical fuel pump pad
- Tested to 1,200 horsepower!
