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KB 426 Hemi Pistons and Piston and Ring SetsKeith Black 426 Hemi Pistons

KB Hypereutectic 426 Hemi Pistons

High performance KB hypereutectic 426 Hemi 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 6 different oversizes. If you are rebuilding a Chrysler 426 Hemi 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 applications.

Classic 426 Hemi Specs

For reference the original stock specifications were:

  • Engine block deck height 10.725 inches
  • Cylinder bore size was 4.250 inches
  • Crankshaft stock stroke was 3.750, main journal size 2.750, rod journal size 2.375
  • Connecting rod length was 6.860 inches
  • Wrist pin diameter 1.030
  • Intake valve 2.250 inches, Exhaust valve 1.940 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 426 Hemi Pistons

Keith Black 426 Hemi 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 426 Hemi Pistons for Stock Stroke Chrysler Dodge Plymouth Mopar 426 Hemi Engines

  • Ring grooves are 5/64 5/64 3/16
  • Crankshaft These pistons are for use with a stock stroke 426 Hemi crank, OEM or aftermarket
  • Connecting Rods These pistons are for use with stock length rods 6.860 inches long with a 1.030 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, -.041 deck clearance and .020 compressed head gasket
  • Bore Size Finished bore size, in inches, that piston is designed for
  • 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

426 Hemi Dome Top Pistons 80cc

kb 426 hemi piston kb210

CH Wt ccs CR with head chamber of: Bore Size Piston Set Piston and Ring Kit
168cc 174cc
1.949 770 / 161 80 9.6 9.2 4.250 standard KB210

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4.255 + .005 over KB210 5

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KB210 KTM05

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4.260 + .010 over KB210 10

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KB210 KTM10

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4.270 + .020 over KB210 20

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KB210 KTM20

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4.280 + .030 over KB210 30

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KB210 KTM30

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4.290 + .040 over KB210 40

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KB210 KTM40

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4.310 + .060 over KB210 60

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KB210 KTM60

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426 Hemi Dome Top Pistons 90cc

kb211 chrysler 426 hemi piston

CH Wt ccs CR with head chamber of: Bore Size Piston Set Piston and Ring Kit
168cc 174cc
1.949 785 / 161 90 10.6 10.0 4.250 standard KB211

Add To Cart

Add To Cart
4.255 + .005 over KB211 5

Add To Cart
KB211 KTM05

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4.260 + .010 over KB211 10

Add To Cart
KB211 KTM10

Add To Cart
4.270 + .020 over KB211 20

Add To Cart
KB211 KTM20

Add To Cart
4.280 + .030 over KB211 30

Add To Cart
KB211 KTM30

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4.290 + .040 over KB211 40

Add To Cart
KB211 KTM40

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4.310 + .060 over KB211 60

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KB211 KTM60

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Molnar Technologies 4340 Steel Billet H Beam 426 Hemi Rods

molnar 392 hemi connecting rod

molnar technologies 392 hemi h beam rod edge

Molnar Chrysler 426 Hemi Connecting Rod Info and Specifications

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
  • Notes Additional information about specific applications
  • 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 or millimeters
  • BE Width Width of the crankshaft end of one rod
  • PE Width Width of the piston end of one rod
  • Bearing Popular rod bearing part number, other equivalent specification bearings may be used based on your preference
  • Part Number Molnar Technologies Connect Rod set part number. Set includes 8 connecting rods
Description and Length Weight Notes Bolt Size Rod Pin Size Pin Size BE Width PE Width Bearing Part Number
6.860 Chrysler Hemi 853   7/16 X 1.600 2.375 1.030 1.017 1.140 CB-527H DH6860YVB8

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If you do not see a set of 426 Hemi 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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