Sold out
Click to zoom in
SKU: B627144030 | UPC: 793348041032
Eagle Pro Street Balanced Rotating Assembly - Chevrolet Small Block 408 ci (4.030" Bore x 4.000" Stroke)
The Eagle Pro Street balanced rotating assembly for small block Chevrolet engines delivers a complete, internally balanced 408 cubic inch kit built around a 4140 forged steel crankshaft and 4340 forged I-beam connecting rods. Designed for street performance and moderate racing applications up to 700+ hp, this kit includes forged pistons, plasma-moly file-fit rings, and high-performance bearings – providing a reliable foundation for stroker 350 builds with improved displacement and torque.
Key Features
- 4140 Forged Steel Crankshaft: 4.000" stroke with 350 main journals (2.448") and standard SBC rod journals (2.100").
- 4340 Forged I-Beam Rods: 6.000" length with 7/16" ARP 8740 cap screws – rated for 700+ hp.
- Forged Pistons: 4.030" bore, dish or flat top (compression ratio varies by head/chamber).
- Plasma-Moly File-Fit Rings: 1/16" - 1/16" - 3/16" ring pack for low friction and excellent sealing.
- Clevite H-Series Bearings: Tri-metal rod and main bearings included.
- Internally Balanced: No heavy metal required – ready for assembly.
- RPM Capability: Safe to 6,500+ RPM with proper components.
- Made in USA: Manufactured and assembled by Eagle Specialty Products.
Product Notes
- Part number: B627144030 (408 ci Pro Street kit).
- Crankshaft: 4140 forged steel, non-twist forging, nitrided for durability.
- Rods: 4340 forged I-beam with ARP 8740 bolts – bushed for floating pins.
- Pistons: Forged 4032 or 2618 alloy (varies by batch) – typically -18cc dish for ~10:1 compression with 64cc heads.
- Balanced to ±2 grams – ready for installation.
- Total kit weight approximately 135-145 lbs.
- Requires 4.030" bore block (350 block bored .030" over).
Installation Notes
- Professional engine builder assembly required.
- Clearance check all components (piston-to-valve, rod-to-cam, etc.).
- Use high-zinc break-in oil and follow proper ring seating procedure.
This Part Fits
| Engine | Block | Bore | Notes |
|---|---|---|---|
| Chevrolet Small Block V8 | 350 ci (4-bolt or 2-bolt main) | 4.030" | 1967-2002 SBC blocks |
| Stroker Builds | Dart, World, GM, etc. | 4.030" | Requires clearancing for 4.000" stroke |
Why Choose Eagle Pro Street?
- 30+ years of crankshaft and rotating assembly expertise.
- Pro Street series offers forged 4140 crank and 4340 rods at an affordable price point.
- Trusted by engine builders for street and strip 408 SBC builds.
Frequently Asked Questions
- Q: What compression ratio?
- A: Typically ~10:1 with 64cc heads and -18cc dish pistons – confirm with your heads.
- Q: Is it externally balanced?
- A: No – fully internally balanced for use with neutral balance flexplate/flywheel.
- Q: Does it include a balancer or flexplate?
- A: No – crankshaft only; uses neutral balance damper and flywheel.
Shipping & Handling
- Method: Freight truck (heavy crate).
- Package Weight: Approximately 160–180 lbs.
- Crate Dimensions (approx): 42" × 24" × 24".
Read More
Eagle
Discover the power and precision of the Eagle collection, featuring the latest 4th generation design (4D) H-Beam rods. Designed for racers pushing their engines to the limit, Eagle 4D rods are engineered to withstand extreme conditions while remaining budget-friendly. With advancements in design, including thicker webbing and enhanced beam strength, these rods are built to handle immense power without sacrificing reliability. Key Features Improved Strength: Eagle Rods use enhanced material in critical areas for increased big end rigidity. Superior Manufacturing: Every Eagle rod is 100% CNC machined for unmatched consistency. High-Quality Materials: Forged from advanced 4340 steel, a trusted choice in the high-performance sector. Robust Bolts: Standard 7/16" ARP 2000 bolts provide a 36% increase in bolt strength. With over 35 years of expertise, Eagle Rods ensures that each rod meets the rigorous demands of high-performance applications. Elevate your racing experience with the ...
View Eagle Products
Head Components
Welcome to our Head Components collection, where we bring together the best products designed to enhance your performance and style. Whether you're a professional or a hobbyist, our selection caters to all your needs. Why Choose Our Head Components? Quality Assurance: Each component is meticulously selected for its durability and performance. Innovative Design: Our products feature the latest technology to improve functionality. Versatile Options: From helmets to headsets, we have everything you need for your next adventure. Customer Satisfaction: We prioritize your needs and provide excellent customer service. Featured Products Check out some of our top-rated head components: High-Performance Cycling Helmets Advanced Noise-Cancelling Headphones Lightweight Sports Caps Comfortable Headbands for All Activities Shop with Us Select your favorite Head Components from our collection and elevate your experience today! Browse through our products to find the perfect fit for yo...
View Head Components ProductsLet customers speak for us
Car totally diferent with the whole kit
Car totally diferent with the whole kit. Ive stood next to wide bodies and my car gets more attention at times . Ive bought the kit twice already.
Ding D.
2015-2023 Dodge Charger Carbon Fiber Wind Splitters
Fantastic emblem! Exactly what I was looking for
Fantastic emblem! Exactly what I was looking for. Great quality emblem.
Jacobus S.
Direct Connection Black Metallic Fender Badge
Worked great for my aftermarket hood on my Chrysler 2023 300C
Worked great for my aftermarket hood on my Chrysler 2023 300C. Thanks
Robert G.
Windshield Washer Squirter Relocation Kit Universal
Easy to install and makes car sound even better
Easy to install and makes car sound even better love the winn
Tracy H.
Legmaker Challenger/Charger Hellcat Demon & Redeye Air Intake
Awesome customer support
Awesome customer support. Had multiple issues with fedex and these guys were excellent in helping me sort everything out. The drop springs are great too! I highly recommend
Anonymous
Swift Spec-R Lowering springs Jeep Grand Cherokee 2011-2021
100/100! perfect CF crafted cold air intake for 6
100/100! perfect CF crafted cold air intake for 6.4 jeep .. even makes my AWE exhaust sound even deeper and you cam here this thing sucking when accelerating even at normal speeds🥶
srt.boizzz
Legmaker 392 TH Short Ram Jeep Grand Cherokee SRT 2012-2021
Trackhawk leg maker intake
10/10
Easy install, high quality carbon fiber, gives the supercharger a loud and clean whine.
Highly recommend
Jei
Legmaker Jeep Grand Cherokee Trackhawk Intake 2018-2021
Awesome
Awesome. Great product and at an extra bonus brings even more pop to the TRX. I love the fact it is washable with the cleaning kit. I will be ordering that soon.
Kevin M.
S&B Custom Intake Cover Trex / TRX / SRT / Hellcat
Shipping was super quick!
Shipping was super quick! The Mighty Mouse catch can looks awesome with the Hellcat Head supercharger mount in my Hellcat Durango!
James G.
Shipping Protection by Route
The TRX Badge Emblem that I ordered from Blacks Ops Auto Works - two emblems decals for both sides
The TRX Badge Emblem that I ordered from Blacks Ops Auto Works - two emblems decals for both sides of my hood looks great matching the quarter panel emblems with the letter R in red, cutout backing as |I ordered 100% - Quality, adhesion contact, excellent - Blacks Ops staff were excellent to work with and made sure that I got what I wanted and ordered.
Joe B.
RAM TRX Grille Badge/Emblem 10.7in x3.25in (Single)
Easy install
Easy install, fixed my issue.
FRANCIS K.
Dodge Durango Jeep Grand Cherokee Driveshaft Center Support Bearing Carrier Upgrade
