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440 Crank K1 Technologies Mopar 440 Crankshaft Big Block Mopar Stroker Cranks

K1 Technologies 413 426 440 Stroker Crank Logo

Top quality 440 crankshafts from K1 Technologies are available here. K1 Technologies is producing extremely strong, 4340 forged steel crankshafts at a reasonable price for the big block Chrysler, Dodge, Plymouth, Mopar 413, 426W, 426 Hemi and 440 engines. These RB series big block Chrysler crankshafts are machined to very close tolerances and are far stronger than the original cranks. These crankshafts are fully machined and available in stock replacement stroke length as well as several different length big block Mopar stroker crankshaft configurations.

Chrysler Plymouth Mopar Dodge Big Block Engine Forged Stroker Cranks

K1 Technologies 413 426 and 440 crankshafts are 4340 forged steel for superior strength and durability. These big block Mopar crankshafts are ideal for any rebuild project, hot rod, nostalgia dragster, supercharged engines, turbo engines, custom muscle car, drag race, boats, trucks, mud bog vehicles, and more. If you are building a hard running big block Chrysler engine, why risk using a lesser quality crank in your engine? Buy the best K1 Technologies big block Mopar cranks, available here at great prices, with fast shipping and knowledgeable tech support.

Big Block Mopar 413 426 440 Stroker Cranks Chrysler 414 426 440 Crankshafts K1

Build a stroker big block Mopar of 540 cubic inches or more! The final engine displacement depends on the crankshaft stroke and cylinder bore size.

 K1 Technologies Big Block Mopar Crankshaft Features:

  • 4340 forged steel
  • Nitrided journal surfaces for superior wear resistance and improved bearing life
  • Multi stage heat treating
  • Machining tolerances held within very tight specs
  • Material properties are closely monitored for optimum performance
  • Counterweight placement designed for improved crankshaft performance
  • .125" radius on rod and main journals for increased strength (requires proper bearings to work with this radius)
  • Precision ground and micro-polished journals
  • Chamfered oil holes for improved oiling
  • Indexed for correct stroke

6 or 8 Bolt Flange

K1 big block Mopar cranks are available in both 6 bolt flange and 8 bolt flange models. The cranks listed in the below table as 426 Hemi cranks, can be used in a 413, 426 Wedge or 440 as long as you are going to use an 8 bolt flywheel or flexplate. The only difference between the cranks marked as 440 and 426, is the 6 or 8 bolt crank flange. Some people prefer one flange or the other, so we offer you both types.

K1 Technologies 6 Bolt Flange 440 Hemi Crankshaft and 440 Stroker Crank List 6 Bolt Flange

  • Muscle car restoration, High performance and race crank applications, 6 bolt flange
  • Stock 413 426 440 big block Mopar crankshaft main journal size of 2.750 in.
  • Stock big block mopar 413 426 440 crankshaft rod pin ( rod journal ) size is 2.375 in.
  • The 2.200 rod pin size is stock big block chevy size, using this size journal requires the matching connecting rod made to work with the bbc journal size. Using this smaller rod journal makes it easier to fit a stroker crank as it requires less grinding on the block for clearance
  • 413 426 and 440 original stock stroke is 3.750 in.
  • Wt = Weight in pounds of big block Chrysler Plymouth Dodge Mopar Cranks
  • use these cranks with connecting rods 6.760 inches or longer, we recommend the matching K1 Technologies Rods
Description Stroke Rod Pin Wt Flange Part #
K1 Tech. 4340 forged steel 4.150 inch 413 426 440 stroker crank, with big block Chevy 2.200" rod journal this crank is designed to be used with connecting rods with standard big block Chevy width. Will not work with K1 DH6760APRBA rods without having rods narrowed .025" Please contact us if you need help with rod selection to match this crank. 4.150 2.200 71 6 bolt

k1 440-4150JC6F

Sold out, Discontinued by K1. Replaced by Molnar Technologies:

440-4150MC6F

$1032.78 $892.01

Add To Cart

K1 Tech. 4340 forged steel 4.150" 413 426 440 stroker crank, stock rod journal size 2.375" 4.150 2.375 72 6 bolt

k1 440-4150JE6F

Sold out, Discontinued by K1. Replaced by Molnar Technologies:

440-4150ME6F

$1032.78 $892.01

Add To Cart

K1 Tech. 4340 forged steel 4.250" 413 426 440 stroker crank, with big block Chevy 2.200" rod journal this crank is designed to be used with connecting rods with standard big block Chevy width. Will not work with K1 DH6760APRBA rods without having rods narrowed .025" Please contact us if you need help with rod selection to match this crank. 4.250 2.200 71 6 bolt

k1 440-4250JC6F

$805.68 $765.40

Add To Cart

K1 Tech. 4340 forged steel 4.250" 413 426 440 stroker crank, stock rod journal size 2.375"

No longer available as we have sold out and it was discontinued by K1.

4.250 2.375 72 6 bolt

k1 440-4250JE6F

 

K1 Technologies 426 Hemi Crankshaft and 426 Hemi Stroker Cranks with 8 Bolt Flange

  • Muscle car restoration, HP and race crank applications, 8 bolt flange
  • Stock 426 Hemi crankshaft main journal size of 2.750 in.
  • Stock 426 Hemi crankshaft rod pin ( rod journal ) size is 2.375 in.
  • The 2.200 rod pin size is stock big block chevy size, using this size journal requires the matching connecting rod made to work with the bbc journal size. Using this smaller rod journal makes it easier to fit a stroker crank as it requires less grinding on the block for clearance
  • 426 Hemi original stock stroke is 3.750 in.
  • use these cranks with connecting rods 6.760 inches or longer, we recommend the matching K1 Technologies Rods
K1 Tech. 4340 forged steel 3.750" stock 426 Hemi crank stroke, stock rod journal size 2.375" 3.750 2.375 71 8 bolt

k1 426-3750JE6F

$805.68 $765.40

Add To Cart

K1 Tech. 4340 forged steel 4.150" hemi stroker crank,with big block Chevy 2.200" rod journal this crank is designed to be used with connecting rods with standard big block Chevy width. Will not work with K1 DH6760APRBA rods without having rods narrowed .025" Please contact us if you need help with rod selection to match this crank. 4.150 2.200 71 8 bolt

k1 426-4150JC6F

Sold out, discontinued by K1

Replaced by Molnar Technologies crankshaft part number:

426-4150MC6F

$1032.78 $892.01

Add To Cart

K1 Tech. 4340 forged steel 4.150" hemi stroker crank, stock rod journal size 2.375" 4.150 2.375 72 8 bolt

k1 426-4150JE6F

$805.68 $765.40

Add To Cart

K1 Tech. 4340 forged steel 4.150" stroker crank, stock rod journal size 2.375". Designed for applications with a target bobweight of 2800 grams. 4.150 2.375 71 8 bolt

k1 426-4150JE6F-3

$805.68 $765.40

Add To Cart

K1 Tech. 4340 forged steel 4.250" stroker crank, with big block Chevy 2.200" rod journal this crank is designed to be used with connecting rods with standard big block Chevy width. Will not work with K1 DH6760APRBA rods without having rods narrowed .025" Please contact us if you need help with rod selection to match this crank. 4.250 2.200 71 8 bolt

k1 426-4250JC6F

$805.68 $765.40

Add To Cart

K1 Tech. 4340 forged steel 4.250" hemi stroker crank, stock rod journal size 2.375"

This crank is no longer available as we have sold out and it was discontinued by K1.

4.250 2.375 72 8 bolt

k1 426-4250JE6F

 

K1 Tech. 4340 forged steel 4.375" hemi stroker crankshaft, with big block Chevy 2.200" rod journal this crank is designed to be used with connecting rods with standard big block Chevy width. Will not work with K1 DH6760APRBA rods without having rods narrowed .025" Please contact us if you need help with rod selection to match this crank. 4.375 2.200 71 8 bolt

k1 426-4375JC6F

Sold out, discontinued by K1

Replaced by Molnar Technologies crankshaft part number:

426-4375MC6F

$1032.78 $892.01

Add To Cart

K1 Tech. 4340 forged steel 4.375" hemi stroker crankshaft, stock rod journal size 2.375" 4.375 2.375 72 8 bolt

k1 426-4375JE6F

Sold out, discontinued by K1. No alternative available at this time.

 

K1 Tech. 4340 forged steel 4.500" hemi stroker crankshaft, with big block Chevy 2.200" rod journal this crank is designed to be used with connecting rods with standard big block Chevy width. Will not work with K1 DH6760APRBA rods without having rods narrowed .025" Please contact us if you need help with rod selection to match this crank. 4.500 2.200 72 8 bolt

k1 426-4500JC6F

$805.68 $765.40

Add To Cart

K1 Tech. 4340 forged steel 4.500" stroker crank, stock rod journal size 2.375"

This crank is no longer available as we have sold out and it was discontinued by K1.

4.500 2.375 73 8 bolt

k1 426-4500JE6F

 

 

K1 Technologies General Info

K1 Technologies is dedicated to providing world class "energy transfer technology" at an affordable price. K1 uses its wealth of knowledge, and real world experience, to produce top quality 426 hemi rods and hemi stroker cranks at an affordable price.

K1 Technologies manufactures H beam connecting rods and I beam connecting rods, in many rod lengths, and 4340 forged big block Chrysler hemi cranks and stroker cranks in a variety of strokes. You may view the full line of K1 Technologies products by clicking on this link: K1 Technologies Performance Engine Parts

We also offer big block Mopar and Hemi pistons in several different types, including forged 426 Mopar Hemi and 440 pistons, supercharged 426 and 440 pistons, etc. as well as hemi and wedge connecting rods, piston rings, bearings, etc. If you can not find the big block RB Chrysler Dodge Plymouth Mopar engine parts you need, or if you have questions, please contact us and let us know what you need, and we will be happy to get back to you ASAP with more info and pricing.

 

 

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