Engines, Bare Blocks - 4.125 in. Cylinder Bore Diameter - Free Shipping on Orders Over $109 at Summit Racing

Summit Racing™ SPC Engine Blocks SUM-150202

Engine Block, 400 Chevy Small Block, Class 35 German Cast Iron, 4-Bolt 350 Mains, 4.125 in. Unfinished Bore Diameter, 2-Piece Rear Main Seal

Part Number: SUM-150202

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Summit Racing™ SPC Engine Blocks SUM-150201

Engine Block, 400 Chevy Small Block, Class 35 German Cast Iron, 4-Bolt 400 Mains, 4.125 in. Unfinished Bore Diameter, 2-Piece Rear Main Seal

Part Number: SUM-150201

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Dart SHP Special High Performance LS Next Pro Cast Iron Bare Blocks 31867212

Dart SHP Special High Performance LS Next Pro Cast Iron Bare Blocks 31867212

Bare Block, Cast Iron, LS Mains, 4.125 in. Bore, 9.24 in. Deck Height, Each

Part Number: DRT-31867212

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Dart SHP Special High Performance Small Block Chevy Cast Iron Bare Blocks 31162211

Engine Block, Cast Iron, 400 Mains, 4.115 in. Bore, 2-Piece Rear Main Seal, Chevy, Small Block, Each

Part Number: DRT-31162211

4.25 out of 5 stars ( 4 )

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Dart SHP Special High Performance Small Block Chevy Cast Iron Bare Blocks 31161211

Engine Block, Cast Iron, 4-Bolt Mains, 4.125 in. Diameter Bore, 2-Piece Rear Main Seal, Chevy, Small Block, Each

Part Number: DRT-31161211

4.75 out of 5 stars ( 8 )

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Dart SHP Special High Performance Small Block Ford Cast Iron Bare Blocks 31375235

Engine Block, Cast Iron , 4-Bolt Mains, 4.125 in. Bore, 1-Piece Rear Main Seal, Ford 351, Small Block, Each

Part Number: DRT-31375235

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

RHS LS Bare Race Blocks 54903U

Engine Block, Aluminum, 6-Bolt Mains, 4.125 in. Diameter Bore, 1-Piece Rear Main Seal, Chevy, LS, Each

Part Number: RHS-54903U

Not Yet Reviewed

Estimated Ship Date: Jun 26, 2025 if ordered today

...Loading

Estimated Ship Date: Jun 26, 2025 if ordered today

Summit Racing™ SPC Engine Blocks SUM-150216

Engine Block, Pro LS, Bare, Cast Iron, 6-bolt Main Bolt Style, 9.240 in. Standard Deck, Chevrolet, Each

Part Number: SUM-150216

Not Yet Reviewed

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Dart SHP Special High Performance Small Block Ford Cast Iron Bare Blocks 31374275

Engine Block, Cast Iron , 4-Bolt Mains, 4.125 in. Bore, 1-Piece Rear Main Seal, Ford 302, Small Block, Each

Part Number: DRT-31374275

Not Yet Reviewed

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Summit Racing™ SPC Engine Blocks SUM-150204

Engine Block, 400 Chevy Small Block, Class 35 German Cast Iron, 4-Bolt 350 Mains, 4.125 in. Unfinished Bore Diameter, 1-Piece Rear Main Seal

Part Number: SUM-150204

Not Yet Reviewed

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Ford Performance Parts Boss 351 C.I.D. Engine Blocks M-6010-BOSS351BB

Engine Block, Cast Iron, 4-Bolt Mains, 4.120 in. Diameter Bore, 1-Piece Seal, 9.50 in. Deck, Ford, Boss 351

Part Number: FMS-M6010BS351BB

Not Yet Reviewed

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

World Products 351 Ford Man O'War Blocks 087182

Engine Block, Cast Iron, 4-Bolt Mains, 4.115 in. Diameter Bore, 1-Piece Rear Main Seal, Ford, Small Block, Each

Part Number: WRL-087182

Not Yet Reviewed

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Dart SHP Pro Special High Performance Small Block Chevy Cast Iron Bare Blocks 31162212

Bare Blocks, Dart SHP Pro Series, Cast Iron, 9.025 in. Deck Height, 4.125 in. Bore, 4-Bolt Main, 2 Piece Rear Main Seal, Small Block, Chevy,Each

Part Number: DRT-31162212

Not Yet Reviewed

Estimated Ship Date: Jun 11, 2025 if ordered today

...Loading

Estimated Ship Date: Jun 11, 2025 if ordered today

World Products SBC Motown Blocks 084030

Engine Block, Cast Iron, 4-Bolt Mains, 4.115 in. Diameter Bore, 2-Piece Rear Main Seal, Chevy, Small Block, Each

Part Number: WRL-084030

5.0 out of 5 stars ( 1 )

Estimated Ship Date: May 28, 2025 if ordered today

...Loading

Estimated Ship Date: May 28, 2025 if ordered today

Ford Performance Parts Boss 351 C.I.D. Engine Blocks M-6010-BOSS35195

Engine Block, Cast Iron, 4-Bolt Mains, 4.125 in. Diameter Bore, 1-Piece Rear Main Seal, Ford, 351W, 351C Mains

Part Number: FMS-M6010BS35195

Not Yet Reviewed

...Loading

Ford Performance Parts Boss 302 Engine Blocks M-6010-B302BB

Cylinder Block, Boss 302, 8.200 in. Deck, 4.115 in. Rough Bore, Each

Part Number: FMS-M6010B302BB

Not Yet Reviewed

...Loading

World Products 302 C.I.D. Ford Man O'War Blocks 087120

Engine Block, Cast Iron, 4-Bolt Mains, 4.115 in. Diameter Bore, 1-Piece Rear Main Seal, Ford, Small Block, Each

Part Number: WRL-087120

Not Yet Reviewed

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Ford Performance Parts 351 Aluminum Windsor Engine Blocks M-6010-Z351

Engine Block, Aluminum, 4-Bolt Cleveland Mains, 4.115 in. Dia. Bore, 1-Piece Rear Main Seal, Ford, 5.8L, Each

Part Number: FMS-M-6010-Z351

4.5 out of 5 stars ( 2 )

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Callies Mopar Hellephant Engine Blocks P5160271AA

Engine Block, Aluminum, Billet Steel Main Caps, 4.125 Bore, 9.25 in. Deck Height, Hellephant, Mopar, Each

Part Number: CPI-P5160271AA

Not Yet Reviewed

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Callies Mopar Drag Pak Engine Blocks P5160272AA

Engine Block, Aluminum, Billet Steel Main Caps, 4.125 Bore, 9.25 in. Deck Height, Drag Pak, Mopar, Each

Part Number: CPI-P5160272AA

Not Yet Reviewed

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

Dart Little M2 Small Block Chevy Cast Iron Bare Blocks 31181235

Bare Blocks, Dart Little M Series, Cast Iron, 9.500 in. Deck Height, 4.125 in. Bore, 4-Bolt Main, 2-Piece Rear Main Seal, Small Block, Chevy, Each

Part Number: DRT-31181235

Not Yet Reviewed

Estimated Ship Date: Monday 4/28/2025

...Loading

Estimated Ship Date: Monday 4/28/2025

RHS LS Bare Race Blocks 54901U

Engine Block, Aluminum, 6-Bolt Mains, 4.125 in. Diameter Bore, 1-Piece Rear Main Seal, Chevy, LS, Tall, Each

Part Number: RHS-54901U

Not Yet Reviewed

Estimated Ship Date: Jun 26, 2025 if ordered today

...Loading

Estimated Ship Date: Jun 26, 2025 if ordered today

World Products Motown Race Engine Blocks 084130

Engine Block, Cast Iron, 4-Bolt Mains, 4.115 in. Diameter Bore, 2-Piece Rear Main Seal, Chevy, Small Block, Each

Part Number: WRL-084130

4.0 out of 5 stars ( 1 )

Estimated Ship Date: May 28, 2025 if ordered today

...Loading

Estimated Ship Date: May 28, 2025 if ordered today

World Products Man O'War Bare Blocks 087082

Engine Block, Cast Iron, 4-Bolt Mains, 4.115 in. Diameter Bore, 2-Piece Rear Main Seal, Ford, Small Block, Each

Part Number: WRL-087082

5.0 out of 5 stars ( 1 )

Estimated Ship Date: May 28, 2025 if ordered today

...Loading

Estimated Ship Date: May 28, 2025 if ordered today

World Products Motown Race Engine Blocks 084120

Engine Block, Cast Iron, 4-Bolt Mains, 4.115 in. Diameter Bore, 2-Piece Rear Main Seal, Chevy, Small Block, Each

Part Number: WRL-084120

Not Yet Reviewed

Estimated Ship Date: May 28, 2025 if ordered today

...Loading

Estimated Ship Date: May 28, 2025 if ordered today