KB 426 Hemi Pistons and Piston and Ring Sets

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

426 Hemi Dome Top Pistons 90cc

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