Engines, Blocks and Components
Circle Track Engines Blocks & Components at JJ Motorsports
Build or upgrade your circle track engine using durable blocks and precision components like deck plug kits and cylinder sleeves from JJ Motorsports. Designed for racing environments, these products are essential for a solid foundation, ensuring optimal performance and reliability in demanding IMCA, USMTS, and dirt oval conditions for late models, modifieds, and street stocks.
Shop trusted brands like Chevrolet Performance for LSX blocks, Dart for high-performance options, and Eagle for forged internals. Explore related categories such as Circle Track Engines, Complete for full assemblies or Circle Track Engines, Bare Blocks for foundational upgrades.
Top Circle Track Engines Blocks & Components
- Engine Dowel Pins GM SBC X Long Bell housing pins Motor plate Chevy Transmission – GM X-long Engine Dowel Pins 2" Long .620" OD. A must for any application running a mid-mount plate to ensure proper alignment of engine and transmission. Pair - 2 per package.
- Dressed 88869604 CT400 IMCA-Sealed 604 Chevy Crate Engine, Dynoed – Dressed version includes distributor, distributor clamp, spark plug wires, and fuel pump block off plate in addition to the GM supplied crate engine. IMCA sealed and approved for use in IMCA. Dyno-verified horsepower and torque and will include a...
- Chevrolet Performance Chevy Performance LSX Cast Iron Block - 4.185 Bore Finished 19417353 – Engine LSX Bare Block 4.185 in Bore 9.240 Deck 6-Bolt Main 1-Piece Seal 6-Bolt Head Iron Orange GM LS-Series Each. The LSX Bowtie Engine Block showcases three major...
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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Billet Main Caps 67-86 Chevy 350 Splayed Outer 1735002
PRW INDUSTRIES, INC.
$232.91If you're running a high-revving small block Chevy 350 and pushing serious power, factory main caps won't cut it. These billet main caps provide the rigidity and precision needed to keep your crankshaft stable under extreme load, reducing deflection and...PQX1735002- SKU:
- PQX1735002
- Availability:
- Ships Same Business Day
- Weight:
- 6.50 LBS
- MFG Part #:
- 1735002
$232.91Qty in Cart: 0Quantity:Price:$232.91Subtotal: -
Moroso Bellhousing Dowel.021off 37938
MOROSO
$25.99Bellhousing alignment is critical for smooth power transfer and long-term drivetrain reliability. A worn or missing dowel pin compromises the precision fit between your engine block and transmission, leading to vibration, misalignment, and potential...MOR37938- SKU:
- MOR37938
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- MFG Part #:
- 37938
$25.99 -
.021 Offset Dowel Pin 15940
LAKEWOOD
$49.95Proper bellhousing alignment is critical to transmission longevity and driveline stability, especially in high-performance GM applications where tolerances matter. This .021 offset dowel pin corrects bellhousing misalignment that can cause binding, gear...LWI15940- SKU:
- LWI15940
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- MFG Part #:
- 15940
$49.95 -
Eagle SBC Rotating Assembly Kit - Competition 12504040
EAGLE
$2,610.99If you're building or rebuilding a Small Block Chevy for serious track duty, a quality rotating assembly is non-negotiable—it's the foundation that determines whether your engine survives peak boost or grenades on the line. The Eagle SBC 12504040...EAG12504040- SKU:
- EAG12504040
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12504040
$2,610.99 -
Eagle SBC Rotating Assembly Kit - Competition 12504030
EAGLE
$2,735.99If you're building a serious Small Block Chevy engine for the track, you need a rotating assembly engineered to handle sustained high RPM abuse without compromise. The Eagle SBC Competition Kit delivers a forged crank and pistons paired with 6.000-inch...EAG12504030- SKU:
- EAG12504030
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12504030
$2,735.99 -
Eagle SBC Rotating Assembly Kit - Competition 12503040
EAGLE
$2,510.99Building a competition small block that can handle sustained RPMs and peak power demands requires a rotating assembly engineered for reliability under extreme conditions. The Eagle SBC Competition Kit delivers a fully forged architecture—crank, pistons,...EAG12503040- SKU:
- EAG12503040
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12503040
$2,510.99 -
Eagle SBC Rotating Assembly Kit - Competition 12503030
EAGLE
$2,329.99Building a competition-ready Small Block Chevy demands a rotating assembly engineered for both maximum output and long-term reliability under extreme loads. The Eagle SBC Rotating Assembly Kit combines a forged crankshaft, precision-forged pistons, and...EAG12503030- SKU:
- EAG12503030
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12503030
$2,329.99 -
Eagle SBC Rotating Assembly Kit - Competition 12501030
EAGLE
$2,566.99When you're building a competition small block, your rotating assembly is the foundation of reliability and power delivery. The Eagle SBC Rotating Assembly Kit delivers forged internals engineered to handle sustained high-RPM abuse while maintaining the...EAG12501030- SKU:
- EAG12501030
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12501030
$2,566.99 -
Eagle SBC Rotating Assembly Kit - Competition 12020030
EAGLE
$2,636.99When you're building a competition-grade Small Block Chevy engine, every component in your rotating assembly directly impacts power delivery, reliability, and repeatability on the track. The Eagle SBC Rotating Assembly Kit delivers forged internals...EAG12020030- SKU:
- EAG12020030
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12020030
$2,636.99 -
Eagle SBC Rotating Assembly Kit - Competition 12012060
EAGLE
$2,447.99Building a 383 cubic inch Small Block Chevy engine demands a rotating assembly engineered for sustained high RPM performance and reliability. The Eagle SBC Rotating Assembly Kit delivers forged internals designed to handle the demands of competition...EAG12012060- SKU:
- EAG12012060
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12012060
$2,447.99Qty in Cart: 0Quantity:Price:$2,447.99Subtotal: -
Eagle SBC Rotating Assembly Kit - Competition 12012040
EAGLE
$2,779.99A competition-grade rotating assembly is the foundation of any serious small-block build—and this Eagle kit delivers the durability and precision needed to handle sustained high RPM and boost. With forged internals throughout, you're getting components...EAG12012040- SKU:
- EAG12012040
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12012040
$2,779.99 -
Eagle SBC Rotating Assembly Kit - Competition 12012030
EAGLE
$2,779.99Building a competition-ready 383 small block Chevy demands a rotating assembly engineered to handle sustained high RPMs and peak horsepower demands without compromise. The Eagle 12012030 kit pairs forged internals with precision tolerances to deliver the...EAG12012030- SKU:
- EAG12012030
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12012030
$2,779.99Qty in Cart: 0Quantity:Price:$2,779.99Subtotal: -
Eagle SBC Rotating Assembly Kit - Competition 12011060
EAGLE
$2,690.99A rotating assembly is the foundation of reliable, high-output power in any competition small block Chevy engine. The Eagle SBC kit (12011060) pairs a forged crankshaft and pistons with premium H-beam rods to handle the extreme loads of sustained...EAG12011060- SKU:
- EAG12011060
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12011060
$2,690.99 -
Eagle SBC Rotating Assembly Kit - Competition 12011030
EAGLE
$2,560.99Building a 383 small block Chevy demands a rotating assembly engineered to handle sustained high-RPM stress without compromise. The Eagle SBC kit combines forged internals with precision tolerances, giving you the reliability to push power gains without...EAG12011030- SKU:
- EAG12011030
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12011030
$2,560.99 -
Eagle SBC Rotating Assembly Kit - Competition 12008030
EAGLE
$2,534.99When you're pushing a Small Block Chevy to competition levels, the rotating assembly is where durability and power meet. This Eagle kit gives you the strength to handle peak cylinder pressures while delivering the precision engineering needed for...EAG12008030- SKU:
- EAG12008030
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12008030
$2,534.99 -
Eagle SBC Rotating Assembly Kit - Competition 12007030
EAGLE
$2,769.99If you're building a serious small-block Chevy that needs to survive high RPM competition, this Eagle rotating assembly gives you the reliability and durability required for consistent power delivery. The forged crank and pistons handle sustained load...EAG12007030- SKU:
- EAG12007030
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- KIT12007030
$2,769.99 -
Dura Bond Head Dowel - Hollow - GM LS 4.8L/5.3L/6.0L AD-326
DURA-BOND
$3.99Cylinder head dowels are critical alignment and locating pins that ensure proper gasket seating and prevent head lift during high-boost applications or sustained high-RPM operation. OEM dowels can wear, shear, or become damaged—compromised dowels lead to...DURAD-326- SKU:
- DURAD-326
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- AD-326
$3.99 -
Dart Main Cap - SBC Little M Block 32731030H
DART
$110.70A quality main cap is critical for small block Chevy engine reliability and longevity. This Dart rear main cap is engineered for precision fitment and durability, ensuring your engine block maintains structural integrity under load. Whether you're...DRT32731030H- SKU:
- DRT32731030H
- Availability:
- Ships Same Business Day
- Weight:
- 2.98 LBS
- MFG Part #:
- 32731030H
$110.70Qty in Cart: 0Quantity:Price:$110.70Subtotal: -
Dart LS SHP Iron Block 9.240 Deck/4.125 Bore 31867211
DART
$3,999.99Building a high-displacement LS engine demands a foundation that won't compromise under extreme power levels. The Dart LS SHP Iron Block delivers the structural integrity and precision bore sizing needed for forced induction, nitrous, or naturally...DRT31867211- SKU:
- DRT31867211
- Availability:
- Ships Same Business Day
- Weight:
- 212.00 LBS
- MFG Part #:
- 31867211
$3,999.99Qty in Cart: 0Quantity:Price:$3,999.99Subtotal: -
Dart LS SHP Iron Block 9.240 Deck/4.000 Bore 31867111
DART
$3,999.99The Dart LS SHP Iron Block is purpose-built for serious LS engine builders who demand reliability without compromise. Its ductile iron construction provides superior strength for high-boost applications and aggressive cylinder pressures, while the 4.000"...DRT31867111- SKU:
- DRT31867111
- Availability:
- Ships Same Business Day
- Weight:
- 185.00 LBS
- MFG Part #:
- 31867111
$3,999.99Qty in Cart: 0Quantity:Price:$3,999.99Subtotal:
