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5.7 6.1 6.4 Hemi Stroker Crankshaft for Gen 3 Hemi

Molnar Technologies Chrysler Dodge 5.7 6.1 6.4 Hemi Stroker Cranks Logo

Molnar Technologies is taking the lead in producing several superior quality Gen 3 Hemi crankshafts. These premium 4340 forged steel cranks are for use in the modern EFI Chrysler and Dodge 5.7, 6.1 and 6.4 Hemi engines. They even make a NHRA legal replacement crank for the Drag Pack engines.

We are proud to be a distributor for the entire Molnar Technologies product line which includes premium cranks and rods for the Gen3 Hemi engines. These gen 3 Hemi cranks are machined from extremely strong 4340 forged steel forgings and held to very tight machining tolerances. They are a great combination of strength and performance at a reasonable price.

Molnar Gen3 Hemi Stroker Kits

If you are looking for all the parts for a complete 5.7L Hemi stroker kit instead of just a crankshaft, you can find all of those parts on our website here: Molnar Technologies 5.7 Hemi Stroker Kits

Forged Chrysler Dodge Gen3 Hemi Stroker Cranks

Molnar Technologies 5.7 6.1 Hemi Crankshaft 5.7L Hemi Stroker Crank

Molnar Technologies 4340 Steel Forged EFI Gen 3 Hemi Crank Specs

These crankshafts will fit in the modern, Gen 3 EFI Hemi engines which include engines with stock displacements of 5.7 liter, 6.1 liter  and 6.4L. The factory cylinder bore size is the main difference in the factory displacement of the 5.7 and 6.1 while the 6.4 has a unique bore and stroke.

OEM Gen3 Hemi Stock bore and stoke dimensions:

  • 5.7 Bore 3.917 inches Stroke  3.578 inches
  • 6.1 Bore 4.055 inches Stroke  3.578 inches
  • 6.4 Bore 4.090 inches Stroke 3.720 inches

Buy the best Gen3 Hemi cranks available from Molnar Technologies here and get dedicated customer service, technical assistance if you need help, unbeatable prices and fast shipping of all in stock items.

Gen 3 Dodge 5.7, 6.1 and 6.4 Hemi Stroker Cranks by Molnar Technologies

All of the Molnar Tech Gen 3 Hemi crank part numbers listed below have the following common features and dimensions:

  • 4340 forged steel
  • Core hardened
  • Nitrided
  • Mag-Particle Inspected
  • Straight oil holes for best rod journal lubrication
  • Stock 5.7L 6.1L 6.4L Hemi main journal size of 2.559 in.
  • 6 bolt Chrysler rear flange
  • One of the 4.080 stroker cranks with a standard bore 5.7 Hemi block = 392 cubic inches
  • One of the 4.080 stroker cranks with a .020 over 5.7 Hemi block = 398 cubic inches
  • Use one of the 4.080 cranks with a .025 over 6.1 Hemi block = 426 cubic inches
  • Use one of the 4.080 cranks with a .025 over 6.4 Hemi block = 434 cubic inches
  • Wt = Approximate weight of crankshaft in pounds
  • We recommend using the matching Molnar Gen3 Hemi rods with these cranks
  • CP Pistons 5.7 and 6.1 pistons for use with these cranks are listed here: CP Gen3 Hemi Pistons and Wiseco brand are here Wiseco 5.7 Hemi Stroker Pistons and Wiseco 6.1 Hemi Stroker Pistons
  • These cranks use the 4 bolt reluctor attachment pattern which is the stock 6.1 pattern. The 4 bolt reluctor will work with these Molnar stroker cranks and the 5.7, 6.1 or 6.4 engine. No reluctor gear is included with the crankshaft. The reluctor gear is sold separately here Gen 3 Hemi Reluctor Gears

Description Stroke Rod Pin Mains Minimum Rod Length Bob Weight Wt Part #

Chrysler Dodge Drag Pack EFI Hemi Crank 3.593 inch stroke with 2.100 inch diameter rod pins

3.593 2.100 Stock 2.559 6.000 1850 54 Molnar 345-3593JB6F

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Chrysler Dodge EFI Hemi stroker crankshaft 3.795 Stroke 2.100 inch rod journal 3.795 2.100 Stock 2.559 6.000 1850 55 Molnar 345-3795JB6F

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Chrysler Dodge Gen 3 Hemi Crank 3.893 inch stroke with 2.100 inch diameter rod pins

3.893 2.100 Stock 2.559 6.000   55 Molnar 345-3893JB6F
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Chrysler Dodge EFI Hemi stroker crank 4.050 stroke with 2.000 inch rod pins 4.050 2.000 Stock 2.559 6.125 1800 56 Molnar 345-4050JA6F

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Chrysler Dodge EFI Hemi stroker crank 4.080 stroke with 2.000 inch rod pins 4.080 2.000 Stock 2.559 6.125 1800 56

Molnar 345-4080JA6F

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Molnar Technologies Dodge 5.7 Hemi 6.1 Hemi crankshaft assemblies are 4340 forged cranks for superior strength and durability. These Gen 3 Hemi crankshafts are an excellent choice for any small block hemi performance muscle car rebuild, high performance street car, normally aspirated, nitrous and turbo and supercharged engines and all out racing engines.

Molnar Reluctor Gears for Chrysler and Dodge Gen 3 Hemi Engines

Molnar 5.7 6.1 6.4 hemi reluctor ring

For use with Molnar Technologies Gen3 Hemi Crankshafts

Description Part #

This reluctor gear is the correct one to use with Molnar Technologies Gen 3 Hemi stroker cranks in engines requiring a 32 tooth reluctor. It uses a 4 bolt attachment which is the same as the OEM Chrysler 6.1 crankshaft. The 2003 - 2008 5.7 and 6.1 used the 32 tooth wheel.



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If you have a 2009 or newer Gen3 Hemi with a 58 tooth reluctor and a Molnar Technologies crankshaft, this is the correct gear for you. (NOTE: Some people count the teeth on the 2009 and later as 60, but difference is only in how people count the large teeth, so even though some people say 58 and some 60, they are both the same reluctor) MRR-60

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2013 and Newer:

Chrysler / Dodge changed the OEM reluctor and engine management system in 2013. If you are working with a 2013 or newer vehicle and a Molnar Technologies crankshaft, then this is the proper 58 tooth reluctor to use.


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