Chevrolet Performance Bowtie Sportsman Engine Block 350 Main 400 Bore w/ 4-Bolt Main/ 1-Piece Rear Main

For a foundation ready to handle serious power, grab this Bowtie Sportsman engine block! It's built by Chevrolet Performance, offering a 350 main journal size and 4.117" finished bore. Not only does it boast strong cylinder walls and reinforced mains, but also priority main oiling. When combined altogether, this ensures excellent stability under load. Meaning, it's a great option for drivers honing a high-performance build.

Features and Benefits:
- Compatible with 350-500 horsepower applications
- Great for street/strip, drag strip, circle track, and high-performance street builds
- CNC-machined cast-iron competition block
- Designed with priority main oiling for more stable oil pressure
- Siamesed cylinder walls increase block strength and cylinder stability
- 1-piece rear main seal ensures stronger, leak-free security
- 4-bolt nodular mains provide increased crankshaft stability under load
- Center three main caps are splayed for stronger bottom-end rigidity
- Caps are secured with grade 8 bolts
- Extra-smooth gasket surfaces for better seal
- Extra-thick deck surfaces have blind-tapped bolt holes for better head gasket sealing
- Minimum cylinder wall bore thickness on 4.155" bore is 0.225"
- Tall lifter bores help keep lifters stable under high spring pressure
- Comes with a rear seal adapter

Specifications:
- Casting number: 10051184
- Crank journal size: 350
- Deck height (standard): 9.025"
- Lifter pattern: standard
- Bore range: 4.117" to 4.155"
- Main bolt degree: 20 degrees
- Nominal cylinder wall thickness: 0.340"
- Oiling system: wet sump
- Max stroke: 3.750"
- Main bearing bulkheads: 0.900" thick
- Machining tolerance: +/-0.001"
- Weight: 196 pounds

Additional Notes:
- All five cam bearing locations require 2.000" O.D. (1.867" I.D.) bearings.
- The top of the tall lifter bore blocks may require clearancing for some roller lifters.
- There is a lifter valley oil scavenging boss below bell housing flange present, but it is not drilled or tapped.
- Oil dipstick holes are not drilled.
- Timing system clearance must be checked.