The Texas Speed 4.00" Stroke LSA Crankshaft is a forged 4340 steel stroker crank made specifically for engines that use the LSA-style 8-bolt rear flange, so the factory 8-bolt flexplate or flywheel bolts up without an adapter. Like every TSP crankshaft it carries a 2.100" rod pin with a .125" fillet radius, weighs 52 lb and is rated by Texas Speed for builds up to 950 horsepower.
This version ships ready to install with a GM 58x reluctor wheel, a GM short keyway and a GM long keyway, and the snout is the standard wet sump design with a taper. Texas Speed also offers complete rotating assemblies built around its crankshafts, with balancing available, for buyers who want the crank, rods and pistons matched as a set.
Specifications
- Stroke: 4.00"
- Material: Forged 4340 steel
- Rear flange: LSA-specific 8-bolt
- Rod journal: 2.100" with .125" fillet radius
- Snout: Standard wet sump with taper
- Reluctor wheel: GM 58x, included
- Keyways: GM short and long crankshaft keyways, included
- Weight: 52 lb
- Power rating per Texas Speed: Up to 950 horsepower
Kit Includes
- Texas Speed forged 4340 LSA-specific 4.00" stroke 8-bolt crankshaft with tapered snout, wet sump, boxed (TSP-LSA-4002100NR-B)
- GM 58x reluctor wheel (GM-12586768)
- GM crankshaft keyway, long (GM-12561513)
- GM keyway for TSP and K1 crankshafts, short (GM-106751)
FAQ
What engines use the Texas Speed LSA 8-bolt 4.00" stroke crankshaft?
It is made for LS engine builds that use the LSA-style 8-bolt rear flange, such as the supercharged 6.2L LSA found in the 2009 to 2015 Cadillac CTS-V and 2012 to 2015 Camaro ZL1, so the factory 8-bolt flexplate or flywheel can be retained.
Does this crankshaft come with a reluctor wheel?
Yes. Unlike the 6-bolt TSP crankshafts that offer a 24x or 58x choice, this LSA crank ships with a GM 58x reluctor wheel plus GM short and long keyways already included.
How much power is the TSP 4.00" LSA crankshaft rated for?
Texas Speed rates its forged 4340 steel crankshafts, including this 4.00" stroke 8-bolt version, for engine builds up to 950 horsepower, with a 2.100" rod pin and .125" fillet radius.
Is this crankshaft wet sump or dry sump?
It is a wet sump crankshaft with a standard snout that includes a taper. It is not the long-snout dry sump design used in dry sump Corvette engines.
Will a 4.00" stroke crank drop into a stock LSA block?
A 4.00" stroke raises displacement from the factory 3.622" stroke, and block clearancing for the longer stroke should be confirmed with the engine builder. Texas Speed recommends ACL bearings with its crankshafts and offers matched rotating assemblies with balancing.
