2003 Engine Blocks & Accessories

Main Bolts, Outer Bolts, With Windage Tray, Chevy, LS, Each

Part Number: NAL-12560273

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Today

Main Bolts, 6-Bolt Main, Inner Bolts, Chevy, 4.8, 5.3, 5.7, 6.0L, Each

Part Number: NAL-12560272

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

Cylinder Head Dowel Pins, Split-type, Chevy, Small Block LS, Set of 4

Part Number: AAF-ALL87024

4.95 out of 5 stars ( 22 )

Estimated Ship Date: Today

Bolt, GM Genuine Parts Replacement Bolt, Hex Head Flange, M8 x 1.25, 0.900 in. Underhead Length, Grade 10.9, Steel, Gray, Each

Part Number: ADO-12556127

3.5 out of 5 stars ( 2 )

Estimated Ship Date: Today

Bellhousing, Transmission Dowel Pin, .621 in. Diameter, Straight, 1.188 in. Length, GM, L92/LS, Each

Part Number: NAL-12720455

Not Yet Reviewed

Estimated Ship Date: Today

Oil Galley Plug, Chevrolet, Small Block Gen III/IV, Each

Part Number: BTC-BTR73460

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

Cylinder Head Locating Dowel Pin, Steel, Chevy, Each

Part Number: ADO-12558081

1.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

Cylinder Head Dowel Pin, 0.500 in. Height, Chevy, Small Block LS, Each

Part Number: DUR-AD326

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

Engine Expansion Plugs, BTR LS Engine Coolant Plug, Large Brass Coolant Plug

Part Number: BTC-BTR61663

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

Engine Intermediate Shaft Bushing, Engin

Part Number: MEL-M-63030B

Not Yet Reviewed

Estimated Ship Date: Today

Main Cap Fastener, Bolt, 6-bolt Main Bolt Style, External Hex Head, Chevrolet, Small Block LS, Each

Part Number: BTC-BTR60272

Not Yet Reviewed

Estimated Ship Date: Today

Main Cap Fastener, Bolt, 6-bolt Main Bolt Style, External Hex Head, Works with Windage Tray, Chevrolet, Small Block LS, Each

Part Number: BTC-BTR60273

Not Yet Reviewed

Estimated Ship Date: Today

Engine Expansion Plug, Brass, Buick, Cadillac, Chevy, GMC, Hummer, Oldsmobile, Pontiac, Saab, Saturn, Each

Part Number: NAL-9427693

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Today

Engine Expansion Plugs, Steel, 0.375 in. Diameter, 0.150 in. Height, Dodge, Ford, Mercury, Set of 10

Part Number: RNB-555-115

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Today

Engine Expansion, Plug Kit, Stock Replacement, Cylinder Head, 1.250 in. Diameter, Brass, Kit

Part Number: MEL-MPE-901BR

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

Engine Expansion Plugs, Steel, 0.540 in. O.D., 0.180 in. Height, Buick, Chevy, Ford, GMC, Mercury, Set of 10

Part Number: RNB-555-007

4.67 out of 5 stars ( 3 )

Estimated Ship Date: Today

Engine Expansion Plug, Steel, 1.007 in. Closed End Diameter, 1.021 in. Open End Diameter, Set of 10

Part Number: RNB-555-018

Not Yet Reviewed

Estimated Ship Date: Today

Engine Expansion Plugs, BTR Plug Core, 0.625 in. Diameter, 0.25 in. Thick

Part Number: BTC-BTR27693

Not Yet Reviewed

Estimated Ship Date: Today

Freeze Plugs, Steel, 0.438 in. Diameter, Chevy, Chrysler, Dodge, Eagle, Ford, GMC, Jeep, Mercury, Set of 10

Part Number: RNB-555-003

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

Expansion Plugs, Steel, 25mm Diameter, Set of 10

Part Number: RNB-555-097

Not Yet Reviewed

Estimated Ship Date: Today

LS BRASS ENGINE BLOCK PLUG OE GM#12561663 - 1

Part Number: EW1-561663

Not Yet Reviewed

Estimated Ship Date: Today

Engine Expansion Plugs, BTR Small Coolant Plug, Zinc Plated

Part Number: BTC-BTR88949

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

Expansion Plugs, Steel, Diameter 1.199 in., Various, Each

Part Number: RNB-555-100

Not Yet Reviewed

Estimated Ship Date: Today

Engine Expansion Plug, Steel, 1.00 in. Diameter, Dodge, Jeep, Each

Part Number: CWA-J3178449

Not Yet Reviewed

Estimated Ship Date: Jun 25, 2026 if ordered today

• Drop Ship
• Special Order

Engine Expansion Plug, Core, 1.625 in. Diameter, Diesel/Flex/Gas, Mopar L6, V6, V8, V10, Chrysler, Dodge, Jeep, Each

Part Number: MOP-04556022

Not Yet Reviewed

Estimated Ship Date: Today