Stroker Crankshafts For LS7 Engines From Lunati

Lunati now offers six new Pro Series stroker crankshafts for the LS7 engine. These new crankshafts can handle up to 1,500 horsepower thanks to forged 4340 steel.

Official Release


Olive Branch, MS: In February, 2010 Lunati unveiled six new Pro Series stroker crankshafts for the LS7 with stroke lengths of 4.325in to 4.625in. This year they have concluded the range by adding a further four. American-made the stroke lengths of these new crankshafts are as follows: 4.000in (P/N: JO711ER); 4.125in (P/N: JU711ER); 4.185in (P/N: JL711ER); and 4.250in (P/N: JP711ER).

Earlier, Lunati introduced ten stroker cranks for LS1 engines. Both series of cranks (LS1 and LS7) encompass stroke lengths of 4.000in to 4.625in and feature conventional 2.559in main bearing journals and 2.100in rod bearing journals. OEM rod lengths of 6.125in are recommended on strokes from 4.000in to 4.185in., but on the remaining longer strokes, from 4.250in to 4.625in., Lunati recommends 6.300in connecting rods for a better stroke-to-rod ratio. All of these cranks are now shelf-stock items.

In addition, Lunati offers custom grinds to any dimension within this stroke range.

Furthermore, custom grinds can be obtained with either standard crank pins (2.100in) or with larger big-block-style pins (2.200in), which adds durability to engines with power adders.

Using American-made premium 4340 steel forgings these cranks are capable of handling 1,500-plus horsepower.  They are endowed with micro-polished and lightened connecting rod journals to reduce rotating mass, micro-polished and gun-drilled main journals to reduce overall mass, special counterweight profiles to direct oil to the bearings and reduce windage, and Lunati’s exclusive finite detailing, profiling, and pulse-plasma nitriding processes. The latter provides consistent journal surface finish without affecting core hardness.

Derek Scott, head of this reputable old firm, originally founded in 1969, maintains a focus on two pragmatic objectives: cutting edge technology coupled to “plain ol’ fashioned superior service.”  They haven’t failed him so far.

  • Stroke lengths of 4.000in, 4.125in, 4.185in, and 4.250in.
  • 4340 steel forgings
  • Capable of handling 1,500-plus horsepower

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About the author

Lauren Camille

Lauren is a graduate of California State University Fullerton, and has experience working for several enthusiast publications. She enjoys drag racing, classic Fords, and vintage Lincolns. She currently races a 1965 Ford Mustang Fastback, and has a soft spot for 1960’s Lincolns. Currently, her collection includes: ’04 Cobra Convertible, ’65 Mustang Fastback, ’04 F350 6.0 diesel, ’96 Jeep Grand Cherokee, and a ’87 Jeep Wrangler. She provides insightful content as a freelance writer for Power Automedia.
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