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KB Mopar 383 Pistons

Keith Black 383 Pistons

KB Hypereutectic Chrysler Dodge Plymouth Mopar 383 Pistons

High performance KB hypereutectic Mopar 383 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 4 different oversizes. If you are rebuilding a Chrysler, Plymouth or Dodge 383 engine 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 engines.

Classic 383 Mopar Specs

For reference the original stock 383 engine specifications were:

  • Engine block deck height 9.980 inches
  • Cylinder bore size was 4.250 inches
  • Crankshaft stock stroke was 3.375, main journal size 2.625, rod journal size 2.375
  • Connecting rod length was 6.358 inches
  • Wrist pin diameter 1.094
  • Intake valve 2.080 inches, Exhaust valve 1.740 inches

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 which are listed on our website here: Forged Mopar 383 Pistons

Keith Black Mopar 383 Piston Features:

  • Made from Hypereutectic 390 Alloy with 16% silicon
  • 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

Hypereutectic 383 Mopar Pistons for Stock Stroke Chrysler Dodge and Plymouth 383 Engines

  • Ring grooves are 5/64 5/64 3/16
  • Crankshaft These pistons are for use with a stock stroke Mopar 383 crank, either OEM or aftermarket with stock stroke
  • Connecting Rods These pistons are for use with stock length rods 6.358 inches long with a 1.094 wrist pin diameter
  • 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 and .038 inch compressed thickness head gasket
  • Bore Size Finished bore size, in inches, that piston is designed to work in
  • Piston set includes 8 pistons, 8 wrist pins and spiral locks
  • Piston and ring kit includes 1 Complete piston set and 1 Moly piston ring set

Mopar 383 Flat Top Pistons

mopar 383 flat top pistons

CH Wt ccs CR with head chamber of: Bore Size Piston Set Piston and Ring Kit
72cc 80cc 85cc 90.5cc
1.908 738 / 190 -5 10.2 9.4 9.0 8.6 4.250 standard kb162 kb162 KTM
$651.59 $586.43

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4.270 + .020 over kb162 20 kb162 KTM20
$651.59 $586.43

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4.280 + .030 over kb162 30 kb162 KTM30
$651.59 $586.43

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4.290 + .040 over kb162 40 kb162 KTM40
$651.59 $586.43

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4.310 + .060 over kb162 60 kb162 KTM60
$651.59 $586.43

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Mopar 383 Dome Top Pistons

chrysler dodge plymouth 383 dome top pistons

CH Wt ccs CR with head chamber of: Bore Size Piston Set Piston and Ring Kit
72cc 80cc 85cc 90.5cc
1.908 779 / 190 6 11.6 10.6 10.0 9.5 4.250 standard kb400 kb400 KTM
$672.27 $605.04

Add To Cart
4.270 + .020 over kb400 20 kb400 KTM20
$672.27 $605.04

Add To Cart
4.280 + .030 over kb400 30 kb400 KTM30
$672.27 $605.04

Add To Cart
4.290 + .040 over kb400 40 kb400 KTM40
$672.27 $605.04

Add To Cart
4.310 + .060 over kb400 60 kb400 KTM60
$672.27 $605.04

Add To Cart
We have even more Chrysler 383 pistons available on this page of our website: 383 Mopar Pistons


Eagle Mopar 383 Connecting Rods H Beam

Eagle Mopar 383 H Beam Rods


Eagle Mopar 383 Connecting Rod Info and Specifications

Eagle is well known for their high quality steel H beam connecting rods. Eagle products are found in everything from serious Mopar, Chrysler, Dodge and Plymouth street cars, to hot street strip cars, to all out drag, oval and road racing engines. Eagle rods are far stronger than the stock original rods.

Eagle H beam connecting 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. Eagle H rods are forged from 4340 grade steel and although it is a more expensive process, all ESP Eagle rods also include a higher content of nickel and chrome, which increases the strength and fatigue life without making the connecting rod brittle.

If you compare the price of magnafluxing, reconditioning and installing new ARP bolts (this should be done even if you use the stock rods, as the original stock rod bolts are the weakest link) into an old set of stock rods to the exceptional value of a set of modern, far stronger Eagle rods the choice is pretty clear. Upgrade to new rods, rather than spending money on old, weaker OEM production rods.

  • 3-D design offers the advantages of reduced weight without sacrificing strength
  • 2 piece forging for increased strength
  • Installation instructions, torque specs and bolt lubricant included
  • Eagle Connecting Rods come with ARP 8740 Capscrews Standard, ARP 2000 bolt upgrade available
  • Silicon bronze bushings installed for use with floating wrist pins
  • Multi-stage 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 Pin Size Pin Size Part Number
6.358 Long Stock Mopar 383 B Engine Replacement Rod 850g Can be used as a high performance or racing replacement for the stock 383 rods. These rods are bushed for use with a floating piston pin. They will work with any aftermarket piston designed to use a floating pin. 7/16 2.375 Stock 383 Size 1.094 Stock 383 Size CRS6358C3D
$745.24 $693.07

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If you do not see a set of Mopar 383 pistons with the specifications you need, please contact us and we will be happy to help you. We have many other pistons, rods and cranks available for these engines.


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