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Summit Racing™ Pro LS Crank and Rod Kits
Pro LS Crank and Rods, Forged 4340 Steel Crank, 4 in. Stroke, Forged 4340 Steel H-Beam Rods, 6.125 in. Rod Length, Chevy, LS, Kit
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Estimated Ship Date from Ohio: Monday 10/19/2026 Would you rather pick it up?
Kit/Combo Contents
Summit Racing SUM-180LS400024X - Summit Racing™ Pro LS Crankshafts
Crankshaft, Pro LS, 4340 Forged Steel, 4 in. Stroke, 24X Reluctor, Lightened Rod Journals, Gun-drilled Mains, Internal balanced, LS1, Each
Kit Item Quantity: 1
Summit Racing SUM-LS6125927 - Summit Racing™ Pro LS Connecting Rods
Pro LS 4340 Forged Steel H-Beam Connecting Rod, 6.125 in. Length, .927 Floating Pin, ARP 2000 7/16 in. 12 pt. Bolts, Stroker Clearanced, LS1, Set of 8
Kit Item Quantity: 1
Overview
Brand:
Manufacturer's Part Number:
SUM-CR4024125
Part Type:
Product Line:
Summit Racing Part Number:
SUM-CR4024125
Rear Main Seal Style:
1-piece
Engine Stroke (in.):
4.000 in.
Balanced:
No
Harmonic Balancer Included:
No
Flexplate Included:
No
Flywheel Included:
No
Pistons Included:
No
Piston Rings Included:
No
Crankshaft Included:
Yes
Crankshaft Material:
Forged 4340 steel
Engine Balance:
Internal
Connecting Rods Included:
Yes
Connecting Rod Length Center to Center (in.):
6.125 in.
Connecting Rod Material:
Forged 4340 steel
Connecting Rod Beam Style:
H-beam
Rod Bearings Included:
No
Main Bearings Included:
No
Cam Bearings Included:
No
Gaskets Included:
No
Oil Pump Included:
No
Camshaft Included:
No
Lifters Included:
No
Timing Chain and Gears Included:
No
Plastigage Included:
No
Assembly Lubricant Included:
No
Quantity:
Sold as a kit.
Notes:
24x reluctor, 6-bolt flange and standard snout for factory wet sump engines, except 1999-2000 thick flange LQ4. Dual 3/16 keyway, Woodruff key not included, re-use factory or use NAL-12561513 rear and add SUM-161000 front for blower balancers. Always clean with mineral spirits and brake-clean oil gallery with 1/4 in. engine brush PIO-4501.
Summit Racing™ Pro LS Crank and Rod Kits
Summit Racing™ Pro LS crank and rod kits deliver industry-leading fit, finish, and durability at an affordable price. These assemblies are tested to over 1,200 hp in turbo applications. Order the kit recommended for your vehicle and engine.
Standard features and specs may include:
* 4340 forged steel crank
* Core hardened to optimum strength, tempered, and nitride hardened
* Lightening rod journals, gun-drilled mains, and profiled counterweights for better engine acceleration
* Maximum journal tolerances of +/- .0001 to ensure consistent bearing clearance
* Straight-shot oiling for maximum oil film strength at the maximum load angle
* 4340 forged H-beam connecting rods
* Designed for 5,000 ft./min. average piston speed in street and drag applications
* 7/16 ARP 2000 rod bolts with 200,000 psi tensile strength; dual-ribbed caps for maximum strength
* Added stroker clearance and balanced to within +/- 1 gram per end
* Full-floating and precision-honed in the USA to +/- .0001 in.
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