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  See more parts for Mercury Cougar
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Eagle Pro Street Rotating Assembly Boss 9 Heads Ford 460 Big Block F-Series 1973-1997 - 65126030

If you're diving into the world of naturally-aspirated racing, the Eagle Pro Street Rotating Assembly is a solid choice that won't let you down. I've had my hands on this setup, and let me tell you, it really knows how to deliver power when you need it the most.

First off, we're talking about a 520 cubic inch displacement here. That’s some serious muscle for your ride. The heart of this assembly is its forged 4340 crankshaft, measuring in at 4.300 inches. It’s built tough, ready to handle the kind of stress that comes with high-performance racing. Pair that with 6.800-inch 4340 I-beam rods, and you’ve got a combination that’s designed for strength and reliability.

The pistons are where it gets even more interesting. These are Mahle forged 4032 flat top pistons, specifically made for Boss 9 heads, with a dome volume of -3CC. They come equipped with plasma-moly file-fit rings, which means you're getting a tighter seal and better performance. Plus, the King XP rod and main bearings are a nice touch, ensuring everything runs smoothly under pressure.

Now, a little heads-up: you’ll need to get this assembly balanced by a qualified machine shop before you hit the track. It’s a crucial step to ensure everything operates as it should. And if you're curious about fitment, this assembly works with a range of Ford models, including the F-Series from 1973 to 1997, the E-Series from 1975 to 1996, and even the Thunderbird and Mercury Cougar from the mid-70s.

In short, the Eagle Pro Street Rotating Assembly is built for those who mean business on the track. It’s a no-nonsense piece of engineering that’ll help you squeeze every last bit of performance out of your engine. If you’re serious about racing, this is definitely worth considering.

Proposition 65

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

Vehicle
1974-1976
 Mercury Cougar

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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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