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You are here: Home > Crankshafts > Probe Industries Crankshafts > Forged 4340 Steel


Probe Industries 4340 Line of Crankshafts are machined from premium 4340 steel and are heat treated for maximum strength. For absolutely serious street and racing applications, Probe Industries 4340 crankshafts are the only choice, perfect for high horsepower, torque and RPM and work great for all levels of power adders.
Buick - V6
Available in a 3.400 standard stroke or a 3.625 stroker models, the Probe Industries Buick V-6 crankshafts are designed to provide reliable performance in a high boost, high horsepower environment.
Chevrolet - 350
Probe Industries 4340 Forged steel crankshafts for the 350 Chevrolet block offer choices of stroke beginning at 3.480 and ranging to 4.000, allowing for cubic inch displacements that begin at 355 and run up to 408 cubic inches, assuming a 4.030 bore. Most strokes are available in Standard or Lightweight, allowing the flexibility to tailor your choice for your particular application.
Chevrolet 400
Probe Industries 4340 Forged steel crankshafts for the 4000 Chevrolet block offer choices of stroke  3.750. 3.875, and 4.000, allowing for cubic inch displacements that begin at 406 and run up to 434 cubic inches, assuming a 4.155 bore. Most strokes are available in Standard or Lightweight, allowing the flexibility to tailor your choice for your particular application.
Chevrolet - Big Block
Probe Industries 4340 Forged steel crankshafts for the 454 Chevrolet block offer choices of stroke beginning at 4.00 and ending at 4.750 allowing for cubic inch displacements that begin at 454 and run up to 554 cubic inches, assuming a 4.310 bore.
Chevrolet - LS Series
Probe Industries 4340 Forged steel crankshafts for the LS1 Chevrolet block offer choices of stroke from 3.900 to 4.125 allowing for cubic inch displacements that begin at 374 and run up to 441 cubic inches, assuming a 3.905/4.125 bore. They include either a 24 or 58 tooth reluctor wheel, as required.
Chrysler - Big Block
Probe Industries 4340 Forged steel crankshafts for the B/RB Chrysler block offer choices of stroke beginning at 3.750 and extending to 4.750 allowing for cubic inch displacements that begin at 446 and run up to 565 cubic inches, assuming a 4.350 bore. 6 and 8 bolt crankshaft flange, as necessary.
Ford - 302
Probe Industries 4340 crankshafts for the Ford 302 block are available as 2.875, 3.000, 3.250, or 3.400 stroke models. Most are offered in either an Internal or External balance design. All feature 2.130 (factory Ford) rod journal diameters.
Ford - 351 Windsor
Probe Industries 4340 Forged Crankshafts for the Ford 351W block are available as 3.500, 3.750, 3.850, 4.000,  4.100, 4.170, and 4.250 stroke models. Most are offered in either an Internal or External balance design and are suitable for very high horsepower applications.
Ford - 351 Cleveland
Probe Industries Crankshafts for the Ford 351 Cleveland and aftermarket block are available as 3.500, 3.750, 3.850, 4.000. 4.100, 4.170, or 4.250 stroke models. They are each offered in either an Internal or External balance design and come as a Standard Weight,crankshaft suitable for high horsepower usage.. Cubic inch displacements range from 351 to 454 cubic inches.
Ford - 4.6L Modular
Probe Industries 3.750 stroke 4340 crankshafts for the 4.6/5.4 Ford allow a stroker displacement of 5.0L in a 4.6L block.
Ford - 460 Big Block
Probe Industries 4340 Crankshafts for the Ford 460 block are available in 4.140, 4.300, or 4.500 stroke models, allowing displacements to 557 cubic inches. They are each offered in an Internal balance design.
Ford - FE V8
Probe Industries 4340 Crankshafts for the Ford FE block are available as 3.980, 4.125, 4.250, and 4.375 stroker models. They are each offered in as an Internal balance design and come in Standard Weight.
Pontiac - 400/455
Probe Industries 4340 Crankshafts for the Pontiac 400 and 455 block are available for the 400 block as 4.000, 4.210, 4.250, 4.375, 4.375, and 4.500 stroke models. They are Internal balance and come in a Standard Weight design. The 455 block crankshafts are available as either a 4.250 or 4.500 stroke.