Campbell Enterprises Header
Shop By Vehicle
Shop By Brand
Search For Parts
LiveZilla Live Chat Software

318 Crankshaft | 5.2 Magnum and 318 Stroker Crank

molnar technologies rods and crankshafts logo

What benefits will I get from using a 318 stroker crank?


The 318 Mopar V8, also known as the 318 Poly head, 5.2L, and 5.2 Magnum has been around since 1957. The 318 is a dependable, small, light and efficient engine package. A 318 can be built to do everything from power a street work truck to being an all out drag, oval track or road racing engine. Many people tend to overlook the 318 as a high performance engine, which is a shame as it offers many benefits, and the core engines are easy to come by and relatively inexpensive.


As originally produced, one thing that the 318 lacks is torque. One of the best ways to dramatically improve torque, horsepower and overall performance of a 318 is to install a stroker crank. A stroker crankshaft really brings the 318 to life as it greatly increases torque and power. Depending on which stroke crank and final bore size you choose to use, you can build 318 stroker motors using these cranks of 370 cubic inches to over 396 cubic inches.


A engine 318 Poly, LA 318 and 5.2 L Magnum Crankshaft

The 318 crank models listed on this page can be used in the old style "A" engine 318 poly head engines, the "LA" series 318 and the 5.2L Magnum engines. So all model 318 engines from 1957 thru 2003 can be built into stroker engines based around these cranks. The rear crank flange will require that very early poly head engines change to the later style transmission for the rear crank flange to properly mate to the trans, or modifications will have to be made. Most 1963 and later transmissions work with these crankshafts with no special changes or modifications required.

4340 Forged Steel 370 390 396 Stroker 318 Crank

K1 Technologies Chrysler Dodge Plymouth Mopar Forged 5.2 318 370 390 Stroker Crank


Molnar Technologies 4340 Forged Steel 5.2 318 Crankshaft Specifications

Molnar Technologies produces superior quality Plymouth Dodge Chrysler Dodge Mopar 318 stroker cranks. We are proud to represent Molnar Tech and sell all of  their premium Molnar Mopar engine products. Molnar Tech is producing precision machined 4340 forged 318 crank assemblies that are machined to very close tolerances and are far stronger than a stock 318 crankshaft. Molnar produces these excellent 318 370 390 stroker cranks in 3 different versions.

Buy the best Molnar Technologies small block Mopar 318 crank here. We provide dedicated customer service, technical assistance, reasonable prices and have been specializing in high performance and racing Mopars since the 1970s.


318 and 5.2 Magnum Stroker Cranks | Molnar Technologies

All of the 318 Stroker 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 318 and 5.2L Magnum main journal size of 2.500 in.
  • 6 bolt Chrysler rear flange
  • The 3.580 stroke crank with a .030 oversize bore = 349 cubic inches
  • The 3.790 stroke crank with a .030 oversize bore = 370 cubic inches
  • The 4.000 stroke crank with a .030 oversize bore =390 cubic inches
  • The 4.125 stroke crank with a .030 oversize bore = 402 cubic inches
  • Wt = weight in pounds
  • We recommend using the matching 4340 billet steel H beam 318 connecting rods with these cranks
  • 318 pistons for these cranks can be viewed by clicking here 318 stroker pistons
  • If you have any questions, please contact us and we will be happy to help you whether you just need a 318 crank, or want a complete stroker kit.


SBM 318 340 Mopar Chrysler Dodge Plymouth

Stroke Description and Notes Rod Pin Dia. Main Journal Size Min
Part # and Price
3.580 3.580" Stroke with Chevy 2.100" Rod Pins 2.100 318 340 6.123 1850 340-3580EB6F

Add To Cart
3.580 3.580" Stroke with stock Mopar Rod Pins 2.125 318 340 6.123 1850 340-3580EF6F

Add To Cart
3.790 3.790" Stroke with Chevy 2.100" Rod Pins 2.100 318 340 6.123 1850 340-3790EB6F

Add To Cart
4.000 4.000" Stroke with Chevy 2.100" Rod Pins 2.100 318 340 6.123 1850 340-4000EB6F

Add To Cart
4.000 4.000" Stroke with standard small block Mopar rod pins 2.125 318 340 6.123 1850 340-4000EF6F

Add To Cart
4.125 4.125" Stroke with 2.000" small block chevy, small journal rod pins 2.000 318 340 6.123 1850 340-4125EA6F

Add To Cart


Molnar Technologies Dodge 5.2 318 crankshaft assemblies are 4340 forged cranks for superior strength and durability. These 318 stroker crank assemblies are ideal for any small block performance muscle

If you are building a hard running Mopar 5.2 318 engine, why risk using a lesser quality crank in your engine? We offer discounted prices on premium top quality, high performance 318 Molnar stroker crankshafts, for not much more than lower quality cranks which are not machined to the same precise dimensions that the Molnar cranks are.

318 Stroker Pistons

Ross 318 Mopar Piston Image

We offer a large variety of pistons to work with these 318 cranks and they may be viewed on this page 318 High Performance and Racing Pistons, supercharged and turbocharged pistons, nitrous pistons, stroker pistons, custom pistons and more. We also sell rods, bearings, gaskets, valvetrain parts and more.



Molnar Technologies small block Mopar 318 stroker cranks on this page are available to fit the following engine blocks:

  • Chrysler 318
  • Dodge 318
  • Plymouth 318
  • Mopar 318
  • Crate engines and aftermarket blocks based on the stock 318 block specs

If you can not find the engine parts you need, or if you have questions, please e-mail us , call, or use our online chat system and let us know what you need, and we will be happy to help.








Campbell Enterprises Performance Parts | About | Contact Info | Privacy Policy | Terms
copyright © Motorsports Parts Corporation T/A Campbell Enterprises. All rights reserved