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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
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Estimated Ship Date from OH, NV, GA: Monday 10/19/2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
SUM-180LS400024X
Part Type:
Product Line:
Summit Racing Part Number:
SUM-180LS400024X
UPC:
190861235472
Engine Stroke (in.):
4.000 in.
Crankshaft Material:
Forged 4340 steel
Engine Balance:
Internal
Rear Main Seal Style:
1-piece
Reluctor Wheel Tooth Quantity:
24
Lightened:
Yes
Requires Narrow Bearings:
Yes
Rod Bearings Included:
No
Main Bearings Included:
No
Rod Journal Diameter (in.):
2.100
Main Journal Diameter (in.):
2.559 in.
Balancer Bolt Thread Size:
M16 x 2.0
Crankshaft Snout Style:
Standard
Weight:
52.000 lbs.
Quantity:
Sold individually.
Notes:
For use with 24X ECUs. Spacers under windage tray will be required. Narrowed rod bearings required. Reluctor ring can be bent, if crank improperly laid down. Dual 3/16 Keyway, Woodruff key not included, reuse factory or NAL-12561513. Front keyway for blowers is SUM-161000. Always clean with mineral spirits and brake-clean oil gallery with 1/4 in. engine brush PIO-4501. Standard Snout and Crank Flange for any Gen. 3 or 4 LS based wetsump engine except for 1999-2000 thick flange LQ4.
Summit Racing™ Pro LS Crankshafts
Summit Racing™ Pro LS forged steel crankshafts deliver industry-leading fit, finish, and durability at an affordable price. Order the model recommended for your year/make and engine application. Check out the long list of premium features:
* 4340 forged steel
* Tested to over 1,200 hp in boosted applications
* Core hardened to optimum strength, then tempered to remove stresses
* Nitride hardened, which results in less distortion, excellent case depth, and more fatigue life
* Profiled counterweights reduce windage
* Precision stroke and indexing
* Lightening holes are drilled in the rod journals for quicker engine acceleration
* Gun-drilled Main Journals for quicker engine acceleration
* Each crank is magnetic particle tested to ensure it's free of flaws
* Large radius fillets for increased strength, narrowed rod bearings for reduced friction
* Straight shot oiling for maximum lubrication just prior to maximum load angle
* Maximum journal tolerances of +/- .0001 in. ensure consistent bearing clearance
* Micro-polished journals with chamfered oil holes for maximum durability and bearing life
* Optimized counterweight placement for reduced twisting at high RPM and ease of balancing
* High-quality reluctor rings are installed with precision fixturing
* Extra 3/16 in. front keyway for blower cars
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Some parts are not legal for use in California or other states with similar laws / regulations
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