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KB Chrysler Dodge Mopar 400 to 450 Stroker Pistons

Keith Black Mopar 400 Stroker Pistons

KB Hypereutectic Chrysler 400 Stroker Pistons

High performance KB Chrysler 450 stroker pistons offer a significant performance improvement for your engine, at a very affordable price. We have these piston sets available in a wide range of sizes including standard bore and many popular oversizes. If you are building a Chrysler, Plymouth, Mopar, Dodge 400 engine into a stroker by using a 440 3.750 stroke crank and are looking for improved performance, without the higher cost of forged pistons, KB performance pistons are an excellent alternative for many street, muscle car restoration, cruising and street / strip applications.

Chrysler 450 Engine Specs

For reference the original stock specifications were:

  • Engine block deck height 9.980 inches
  • Cylinder bore standard size 4.342 inches
  • Crankshaft stock stroke 3.380
  • Connecting rod length 6.358 inches
  • Wrist pin diameter 1.0940

We do not recommend hypereutectic pistons for use with superchargers, turbochargers, nitrous systems or for serious racing engines. For those applications we strongly recommend forged pistons. Our complete piston index list for stock replacement, cast, hypereutectic and forged pistons is available here: CE Engine Pistons Index

Keith Black Mopar 400 Stroker 450 Piston Features:

  • Hypereutectic 390 Alloy
  • Fully machined head and valve reliefs
  • Accumulator groove to aid with compression ring seal
  • Diamond finished skirts
  • CNC machined pin bores to insure straight and accurately sized bores

KB 400 Stroker Pistons for use in Chrysler Dodge Plymouth Mopar 400 Based Engines

  • Stroke These pistons are for use with a 3.750 inch stroke crank, OEM or aftermarket
  • Connecting Rod Length 6.358 inch
  • Wrist Pin Size 1.0940 inch diameter
  • Ring grooves are 5/64 5/64 3/16
  • CH Compression Height This is the measurement from the centerline of the piston pin bore to the top flat part of the piston
  • Wt Piston weight in grams followed by wrist pin weight in grams
  • ccs displacement of dome, or dish, and valve reliefs, measured in ccs
  • CR Compression ratio estimates based on a .030 oversize, -.041 deck clearance and .020 compressed head gasket
  • Bore Size Finished cylinder bore size, in inches, that piston is designed for

What is Included?

  • Piston set includes 8 pistons, 8 wrist pins and locks
  • Piston and ring kit includes 1 Complete engine piston set and 1 piston ring set

Chrysler 400 Stroker 450 Step Head Top Pistons use with 6.358 Length Connecting Rod

KB215 Chrysler 450 Stroker Piston

KB215

NOTES:

Centered pin. Suggest checking quench dome with clay for clearance. .095 tall quench pad. Closed chamber heads require the quench dome to be machined down. Made from Chrysler 400 block. Use stock or Eagle H beam 6.358 long rods. Comp. ratio will change with quench dome machining.

CH Wt ccs CR with head chamber of: Bore Size Piston Set Piston and Ring Kit
72cc 80cc 84cc 88cc
1.722 740 / 190 1.5 12.5 11.4 10.9 10.6 4.342 standard KB215

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KB215 KTM

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4.362 + .020 over KB215 20

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KB215 KTM20

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4.372 + .030 over KB215 30

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KB215 KTM30

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4.382 + .040 over KB215 40

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KB215 KTM40

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4.402 + .060 over KB215 60

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KB215 KTM60

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KB251 Mopar 400 Stroker Piston

KB251

NOTES:

Centered pin. Suggest checking quench dome with clay for clearance. .260 tall quench pad. Closed chamber heads require the quench dome to be machined down. Made from Chrysler 400 block. Use stock or Eagle H beam 6.358 long rods. Comp. ratio will change with quench dome machining.
CH Wt ccs

CR with head chamber of:

Bore Size Piston Set Piston and Ring Kit
72cc 80cc 84cc 88cc
1.722 705 / 190 4.4 12.9 11.8 11.3 10.9 4.342 standard KB251

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KB251 KTM

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4.362 + .020 over KB251 20

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KB251 KTM20

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4.372 + .030 over KB251 30

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KB251 KTM30

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4.382 + .040 over KB251 40

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KB251 KTM40

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4.402 + .060 over KB251 60

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KB251 KTM60

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Chrysler 450 Step Head use with 6.760 Long Rod
KB280 450 Stroker Piston

KB280

NOTES:

.150" quench dome, centered pin. Suggest checking quench dome with clay for clearance. Engine cannot be assembled without machining quench dome. Made from Chrysler 400 black. Use stock or aftermarket 440 length rods of 6.760 inches.

CH Wt ccs CR with head chamber of: Bore Size Piston Set Piston and Ring Kit
72cc 80cc 84cc 88cc
1.327 550 / 190 0 12.3 11.3 10.8 10.4 4.342 standard KB280

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KB280 KTM

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4.362 + .020 over KB280 20

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KB280 KTM20

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4.372 + .030 over KB280 30

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KB280 KTM30

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4.382 + .040 over KB280 40

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KB280 KTM40

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4.402 + .060 over KB280 60

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KB280 KTM60

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Chrysler 400 Stroker Connecting Rods

While you are replacing your engine pistons it is a good time to also upgrade your rotating assembly by installing modern connecting rods. Why risk damage to your rebuilt performance engine by using old stock connecting rods that have been through who knows what kind of abuse.

With the high cost of machine shop service these days you can often upgrade to far stronger modern rods for not much more than the cost of reconditioning a set of stock rods.

Molnar Technologies H Beam 400 B Engine 450 Stroker Connecting Rods

molnar 440 h beam connecting rods

Molnar Technologies H Beam rods are machined from billet 4340 steel, and then heat treated to provide improved strength. To make the rods even stronger, they are shot peened to which also increases fatigue life. All Molnar connecting rods are fitted with highly durable premium bronze bushings for use with floating pin type pistons. Each rod set includes ARP fasteners, moly lubricant and installation guidelines.

All Molnar rods are finished in the United States at the Molnar Technologies shop in Michigan. Critical rod dimensions are are held to very precise tolerances of +/- .0001 of an inch, which is the tightest tolerance you will find in the performance and racing aftermarket.

  • Description and Length Engine model that rod is made to for and length of the rod, as measured center to center, in inches.
  • Weight Weight in grams, of one complete connecting rod assembly
  • Bolt Size Bolt dimensions in inches, Rods come with ARP2000 fasteners installed
  • Rod Pin Size Crank rod journal diameter
  • Pin Size Piston pin diameter, in inches
  • BE Width Width of the crankshaft end of one rod
  • PE Width Width of the piston end of one rod
  • Part Number Molnar Technologies rod set part number. Set includes 8 connecting rods
Description and Length Weight Bolt Size Rod Pin Size Pin Size BE Width PE Width Part Number
6.760 long Big Block Mopar 852 7/16 2.375 1.094 1.017 1.140

DH6760YYB8-A


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Eagle Chrysler 400 Connecting Rods H Beam

Eagle 4340 Steel H beam rods are manufactured from a TWO-PIECE FORGING. The forging process forces the grain into the shape of a connecting rod, resulting in a superior fatigue life. The rod cap is forged separately so that the grain runs perpendicular to the load forces, which strengthens the rod.

Mopar 400 H Beam Connecting Rods

  • Installation instructions, torque specs and bolt lubricant included
  • ARP 8740 Capscrews are included, ARP 2000 bolt upgrade available at an additional cost
  • Silicon bronze bushings installed for use with floating wrist pins
  • Heat treated
  • Packaged in weight matched sets
  • Certified 4340 steel, vacuum degassed to remove impurities
  • Each forging is X-rayed, sonic tested and magnafluxed to insure quality
  • Shot peened to stress relieve the metal
  • Precision Alignment Sleeves positively locate the rod cap, maintaining big end bore size and eliminating cap walk.
Description and Length Weight Notes Bolt Size Rod Journal Size Pin Size Part Number

6.358 Long

Stock Length Mopar 400

850g Can be used as a high performance or racing replacement for the stock 400 rods. These rods are bushed for use with a floating piston pin. They will work with any aftermarket piston designed to use a 1.094 inch diameter floating wrist pin. 7/16 2.375 Stock 400 Size 1.094 Stock 400 Size CRS6358C3D
$677.00 $643.15

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