Engine Block
The anchor for every engine is the block. This component, made from either aluminum or cast iron, houses the rotating assembly, camshaft, timing set, and other components. It also is connected to the cylinder heads, creating the combustion chamber where power is created. Over time, the cylinders and other areas of the block wear from use, requiring repair or replacement.
When choosing an engine block, first confirm the make and engine size you are looking for. Next, choose specifications and options such as bore, lifter, and deck size, rear main seal and main cap types, as well as a block that will work best for your application, whether a daily-driver or drag-race only vehicle. From the remaining compatible options, choose the option that best fits your needs and budget.
JEGS offers a large selection of engine blocks from top brands like Dart, World Products, Chevrolet Performance, Brodix, Ford Performance and many others. Each engine block is machined from high quality materials to provide a great foundation for your next engine build.
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Ford Racing Engine Block1.6L Kent 4-Cylinder 8.200" Deck Height w/ Extra Material 3.185" to 3.187" Semi-Finished Cylinder Bores .5145" to .5155" Lifter Bore Diameter
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$2,599.99
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Mopar Performance P5007466
Mopar Performance A4 Aluminum Engine Block Fits W8, W9 or W9RP Cylinder Head
A4 Aluminum Engine BlockFits W8, W9 or W9RP Cylinder Head No Bell-Housing Deck Height: 8.400" Midget Motor
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$7,139.99
$5,679.36
SAVE $1,460.63
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Ford Racing Engine BlockBoss 351 Cast Iron 4-Bolt Main 3.990"-3.995" Rough Bore 9.2" Deck Height 195 lbs.
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$3,350.00
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Chevrolet Performance 12729604
Chevrolet Performance 12729604 LS3/L92 6.2L Aluminum Bare Engine Block
LS3/L92 6.2L Bare BlockDirect replacement for 2007-2008 L92, 2008-2015 LS3, 2009-2012 L9H and 2010-2015 L94/L99 Production aluminum block with iron sleeves 4.065" finished bore (103.25mm) Tested to over 500 horsepower!
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$2,960.16
Availability Date Unknown
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Chevrolet Performance 12733807
Chevrolet Performance LQ4/LQ9 6.0L Gen III Cast-Iron Bare Engine Block
Gen III 6.0L Bare BlockDirect replacement for Gen III Block LQ4 & LQ9 Production cast iron block Production oiling system 6-bolt main bearing caps 4.000" finished bore (101.60mm) 9.240" deck height
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$2,528.79
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LSX Engine BlockTall Deck 3.880" Finished Siamese Bore 9.720" Semi-Finished Height 4.500" Maximum Stroke Capable of 364-500cid Accepts Gen IV LS & LSX heads, cranks, cams, etc. Approximate Finished Weight: 225 lbs
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$4,325.24
(1)
Ships on 04/29/25
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Block Aluminum 11.625dh
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$7,815.50
Estimated to ship direct from manufacturer on 12/31/25, pending manufacturer availability.
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LS Next Engine BlockGM LS-series 4.000" Bore 9.240" Deck Standard Cam Location 4-Bolt Steel Main Caps Aluminum
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$7,249.99
Ships on 08/27/25
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Aluminum Big M Engine Block4.500'' Bore 10.400'' Deck Height Steel Main Caps Camshaft Location Raised +.400''
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$6,999.99
Ships on 08/27/25
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Speedmaster 1-286-011-01
Speedmaster 1-286-011-01 SBC 400 B-4.125 M-350 DH-9.025 4-Bolt Billet Main Bare Iron Engine Block
$2,422.50
Estimated to ship direct from manufacturer in 24hrs
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Motown II Cast Iron Engine Block Requires 50 mm Cam Bearings Raised Cam: 0.134 in. Lifter Bore: OEM (Std. Chevy) Lifter Diameter 400 Mains w/4-Bolt Billet Splayed Caps Siamesed Bore: 4.120 in. Block Deck Height: 9.025 in. (Std. Chevy)
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$4,736.26
Estimated to ship direct from manufacturer on 04/28/25, pending manufacturer availability.
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Motown Cast Iron Engine BlockSmall Block Chevy 350 Mains 4.120 in. Bore Raised Cam Billet Splayed 4-Bolt Main Caps
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$4,736.26
Estimated to ship direct from manufacturer on 04/28/25, pending manufacturer availability.
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Dart 31223545
Dart Big M Sportsman Iron Engine Block Block Big Block Chevy 4.560 in. Bore, +.400 in. Raised Camshaft
Big M Sportsman Iron Engine BlockBig Block Chevy 4.560 in. Bore 9.800 in. Deck Height +.400 in. Raised Camshaft Location Ductile Iron Main Caps Sold Individually
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$4,299.99
Ships on 08/27/25
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Alum Bbc 4.5 B Raised Cam
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$6,669.99
Estimated to ship direct from manufacturer on 12/31/25, pending manufacturer availability.
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$2,968.57
Ships on 08/27/25
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Big M Sportsman Iron Engine BlockBig Block Chevy 4.500 in. Bore 9.800 in. Deck Height Ductile Iron Main Caps Sold Individually
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$3,999.99
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Big M Sportsman Iron Engine BlockBig Block Chevy 4.600 in. Bore 10.200 in. Deck Height Ductile Iron Main Caps Sold Individually
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$3,999.99
Ships on 08/27/25
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Chevrolet Performance 19420904
Chevrolet Performance GM Gen V LT-Series 6.6L Cast Iron Bare Block [L8T Direct Replacement]
GM Gen V LT-Series 6.6L Cast Iron Bare Block Direct Replacement L8T Engines 4.065 in. finished bore (103.250 mm) 6-Bolt Nodular Iron Main Bearing Caps Cast Iron
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$2,267.57
Ships on 04/28/25
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Iron Eagle Race Series Engine BlockSmall Block Ford Bore: 4.000" Deck: 9.200" (351C) Main Size: 302
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$3,541.40
Ships on 08/27/25
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Merlin IV Cast Iron Engine BlockBig Block Chevy 2-Piece Rear Main Seal 4.595 in. Bore 9.500 in. Deck Height 55 mm Cam Journal .904 in. Lifter Bore Billet Splayed Main Caps
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$5,173.48
Estimated to ship direct from manufacturer on 04/28/25, pending manufacturer availability.
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Aluminum Big M Engine Block4.250'' Bore 10.400'' Deck Height Steel Main Caps Camshaft Location Raised +.400''
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$6,999.99
Ships on 08/27/25
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Ford Performance M6010A460XBB
Ford Performance M-6010-A460XBB Cast Iron Siamese Big Bore 460 Block [4.490 in. Bore]
460 Siamese Big Bore Engine BlockRough Bored to 4.490 in. Max Bore 4.625 in. Siamese Cylinders 10.322 in. Deck Height 3 in. Main Journal Diameter 4-Bolt Mains Nodular Iron Main Caps Weight: 275 lbs. High-Strength
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$3,950.00
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Merlin Cast Iron Engine Bare BlockBig Block Chevy Gen VI 1-Piece Rear Main Seal 4.495 in. Bore 9.800 in. Deck Height Standard Cam Journal Nodular Iron Splayed Main Caps
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$3,842.02
Estimated to ship direct from manufacturer in 24hrs
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Dart 31213455
Dart Big M Iron Engine Block Big Block Chevy 4.500 in. Bore, +.400 in. Raised Camshaft
Big M Iron Engine BlockBig Block Chevy 4.500 in. Bore 10.200 in. Deck Height +.400 in. Raised Camshaft Location Billet Steel Main Caps Sold Individually
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$5,099.99
Ships on 08/27/25
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Dart 31182125
Dart Little M Engine Block Small Block Chevy 9.325 in. Deck, +.391 in. Raised Camshaft
Little M Engine BlockSmall Block Chevy 9.325 in. Deck Height 4.000 in. Cylinder Bore +.391 in. Raised Camshaft Location 400 Main Bearings Steel Main Caps Sold Individually
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$4,749.99
Ships on 08/27/25
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World Products 087072
World Products Man O' War Small Block Ford Cast Iron Bare Engine Block w/2.248 in. (302 ci.) Mains
Man O' War Small Block Ford Cast Iron Engine BlockDeck Height: 9.500 in. Bore: 3.995 in. Main Size: 2.749 in. Nodular Iron 4-Bolt Splayed Mains
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$4,494.05
Estimated to ship direct from manufacturer in 24hrs
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Iron Eagle Pro 302 Engine BlockSmall Block Ford Bore: 4.000" Deck: 8.200" (302 Standard Deck) Main Journal Size: 2.249" (302)
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$3,743.03
Ships on 08/27/25
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