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Eagle Specialty Products SIR5700BBLW 5.7" Lightweight 5140 Forged I-Beam Connecting Rod for Small Block Chevy

$235.06


Manley Performance H-Plus Forged Connecting Rods

Ostensibly rated at 373 horsepower, the 421 was more than simply a bored and stroked 389. Where the regular 389 used 3.000-inch main bearing journals and two-bolt main bearing caps (the Super Duty 389 added four-bolt main caps), all 421s used 3.250-inch journals and four-bolt caps. The 421’s intake and exhaust valves measured 1.96 and 1.66 inches, respectively. Forged crankshafts, forged connecting rods and solid-lifter camshafts filled the 11.0-compression 421s, and single or dual-quad intakes topped the engines.

The most common type of steel used for high-performance connecting rods is 4340 chromoly steel. 4340 has a tensile strength of 145,000 psi. Its hardness, ductility and other properties will vary based on the heat treatment applied to it. 4340 may also be referred to as aircraft grade or aircraft quality steel.

Manley Performance H-Plus Forged Connecting Rods



The connecting rod is the vital link between the piston and power. When engine output is increased, the demands placed on the connecting rod increase as well. To ensure engine reliability in all conditions, original connecting rods should be replaced with heavy duty specification parts. Cosworth Forged Connecting Rods are manufactured from high strength 4340 (EN24) steel and machined to precise tolerances.


Cosworth Forged connecting rods are machined from proprietary forged steel and have been engineered with a light weight, yet ultra-strong design. Reducing engine component weight improves engine response and reduces the demand placed on other critical engine components.

Features
  • Detailed data card included.
  • Rods now include genuine Cosworth H11 tool steel rod bolts (260,000psi).
  • Proprietary forging made in the USA.
  • Detailed machined work to maintain optimum weight and strength.
  • Solid Beam design for high power applications
  • RadialTruss small end for superior strength and reduced reciprocating mass
  • Manufactured from 4340 (EN24) steel
  • Set of six matched rods
  • Nissan VR38DETT Application
  • Center to Center - 164.99mm
  • P.E. Bore - 23.03mm
  • B.E. Bore - 59.00mm
  • Total Nominal Weight - 621 grams (-104 less than OE)


$1999.00 USD

Corvair Forged Connecting Rods - Set of 6 - SPA LLC

The most common type of steel used for high-performance connecting rods is 4340 chromoly steel. 4340 has a tensile strength of 145,000 psi. Its hardness, ductility and other properties will vary based on the heat treatment applied to it. 4340 may also be referred to as aircraft grade or aircraft quality steel.

He then turned his attention to the engine and started assembling a 421 from several pieces. He found an actual 421 block, though he never determined its source, bored it .030 inches over and filled it with a 421 crankshaft, Super Duty forged connecting rods, Pontiac forged aluminum pistons and a McKellar #10 solid lifter camshaft.