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Eagle Specialty Prod Competition Rotating Assembly 4.030in Bore 4.000in Stroke Ford 5.8L V8 Small Block 408 1969-1997 - 14129030

If you’re serious about building a racing engine, the Eagle Competition Rotating Assembly is worth your attention. I’ve seen a lot of parts in my time, but Eagle really puts effort into sourcing components that strike the right balance between performance and reliability—without draining your wallet. This assembly is designed for those who push their engines to the limit, whether you're running exotic fuels, nitrous, or forced induction setups. Trust me, it’s built to handle the heat.

You’re looking at a solid setup here: it features a 4.000" forged 4340 steel crank that’s tough enough to take a beating. The 6.250" H-Beam rods are not just for show—they come with 7/16" ARP 8740 bolts, which means they’re built to last. The pistons are forged 4032 Mahle with a -20cc inverted dome and a 4.030" diameter, paired with plasma-moly file-fit rings that ensure a snug fit and optimal performance. Plus, you get King XP rod and main bearings thrown in for good measure. This is the kind of assembly that makes you feel confident when you’re on the track.

Features

  • File-fit piston ring gap for precision sealing
  • Piston ring thickness: 1.0mm, 1.0mm, 2.0mm
  • Hardened, narrowed, or chamfered rod bearings
  • Rod bearings included for easy installation
  • Reverse twist iron for better sealing
  • No thrust washer included
  • Eagle Specialty Products - Competition Rotating Assembly
  • Barrel faced plasma-moly top piston ring
  • Assembly balanced: no
  • Internal balance for smooth operation
  • 7/16" connecting rod bolt diameter
  • ARP 8740 for strength
  • H-Beam design for durability
  • 6.250" connecting rod length
  • Forged 4340 steel for toughness
  • No center counterweights on the crankshaft
  • 6 crankshaft flange bolt holes
  • Main journal diameter: 3.000"
  • Forged 4340 steel crankshaft
  • No reluctor on the crankshaft
  • Rod journal diameter: 2.100"
  • 4.000" crankshaft stroke
  • Cylinder bore diameter: 4.030"
  • Damper not included
  • Flexplate/flywheel not included
  • Hardened, narrowed, or chamfered main bearings
  • Main bearings included for convenience
  • No oil rail support included
  • Mahle pistons for quality
  • -20cc piston dome volume
  • Inverted dome piston face
  • Forged 4032 aluminum pistons
  • Piston pin diameter: .927"
  • Full floating piston pin
  • Just a heads-up: you might need to do some minor clearancing of the block.

Notes:

Universal Fitment: This assembly is designed to be versatile, so it should fit a variety of vehicles. Still, I recommend doing your homework to ensure it’s compatible with your specific setup. Better safe than sorry!

Other Part Numbers:
Eagle #eag14129030

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

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Who is EAGLE?

EAGLE SPECIALTY PRODUCTS, aka EAGLE, has been at the forefront of developing top-quality engine components. The company officially started back in 1992 but has been developing their product for ten years prior.  Since the company started, it has continuously produced some of the market's best engine components and is widely used by engine builders worldwide.

Imitated But Not Duplicated

Due to the company's success, its products have been imitated by other companies even up to the part numbers. But the similarity ends only up to how they look. EAGLE uses the finest materials and has invested in the most state-of-the-art manufacturing machinery for them to create a product that would be able to take any punishment it is subjected to. It is tested to be superior to other brands and considered the best upgrade for OEM counterparts.

No To Shortcuts

The company sets the benchmark on how valves should be properly made. Using their years of experience creating rods, they have already designed over 200 different rods and 180 crankshafts. The company does not allow cost to compromise its material used, manufacturing process, and quality test. 

High-End Quality

All of Eagle's products are made up of high-quality materials. They use certified 4340 Chromoly steel. Using their own special heat treatment process, they are able to create a product that is much stronger compared to other competitors using the same raw material. 

They manufacture their rods using a 2-piece forging process that allows the rod to be stronger. This process orients the "grain" of the metal to the direction of the stress. Eagle uses a state-of-the-art Sunnen Krossgrinding system that allows them to create perfect cuts and bore consistently. 

Purchase EAGLE rods at Vivid Racing

If you want to upgrade your engine rods to something stronger and more reliable, then EAGLE is the brand for you. With their proven design and formula for creating rods, they have been sought after by top racing teams and engine builders. If they trust Eagle, so can you. Visit Vivid Racing and check out the list of parts specifically for your needs.

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