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SKU: 8B663A-10
ACL Race Series Connecting Rod Bearing Set .010" Undersize - Chevrolet Small Block V8 305 / 350 / 400 (1967-2007)
The ACL Race Series .010" undersize connecting rod bearings for Chevrolet small block V8 engines (305, 350, 400) provide high-strength tri-metal construction designed for performance and race applications where the crankshaft has been turned .010"/.010". Featuring a hardened steel backing, leaded bronze intermediate layer, and precision electroplated lead-indium overlay, these bearings deliver increased load capacity, better embeddability, and superior oil clearance consistency – ideal for rebuilt or high-performance SBC engines.
Key Features
- Tri-Metal Construction: Hardened steel back + copper-lead intermediate + lead-indium overlay for maximum fatigue resistance.
- Race Series Design: Increased eccentricity and crush for better oil clearance and load distribution.
- .010" Undersize: For crankshafts turned 0.010" on rod journals (2.090" finished diameter).
- Precision Tolerances: Manufactured to ±0.0001" tolerances for consistent oil clearance.
- High Load Capacity: Supports moderate to high horsepower SBC builds (up to 700+ hp with proper prep).
- Oil Groove Design: 3/4 groove in upper half for improved oil supply.
- Made in Australia: Produced by ACL to ISO 9001 quality standards.
Product Notes
- Part number: 8B663A-10 (set of 8 rod bearings – full engine set, .010" undersize).
- Fits all small block Chevrolet V8 engines with 2.100" stock rod journal turned .010".
- Compatible with 265, 283, 305, 327, 350, 383, 400, and most stroker variants using .010" undersize rod journals.
- Available in other sizes (STD, .001", .020") contact for details.
- Recommended for performance and race engines not for stock replacement.
- Individual bearing weight approximately 45-50 grams (full set ~800g).
Installation Notes
- Direct replacement – requires engine disassembly (rods off crankshaft).
- Professional engine builder installation recommended.
- Verify crankshaft journal size and plastigage clearances during install.
- Use high-zinc engine oil or break-in additive for proper bedding.
This Part Fits
| Year | Make | Model | Engine |
|---|---|---|---|
| 1967-2007 | Chevrolet | Camaro, Corvette, Chevelle, Nova, Truck, etc. | 305 / 350 / 400 SBC V8 (.010" rod journals) |
| 1967-2007 | GMC | Sierra, C/K, Suburban, etc. | 305 / 350 / 400 SBC V8 (.010" rod journals) |
| Universal | Any | Small Block Chevrolet V8 | 265-400 ci with .010" undersize rod journals |
Why Choose ACL Race Series?
- Australian manufacturer with decades of motorsport heritage – trusted by engine builders worldwide.
- Race Series bearings proven in high-horsepower street and race SBC engines.
- Superior materials and tolerances vs. OE and many aftermarket brands.
Frequently Asked Questions
- Q: Are these for big end or main bearings?
- A: Connecting rod (big end) bearings 8 pieces for full V8 set.
- Q: What journal size?
- A: For crankshafts turned .010" undersize (2.090" rod journal diameter).
- Q: What oil clearance?
- A: Typically 0.0015"-0.0025" with turned crank plastigage recommended.
Shipping & Handling
- Method: Standard ground shipping.
- Package Weight: Approximately 2–3 lbs.
- Box Dimensions (approx): 8" × 6" × 2".
ACL
ACL manufactures performance engine bearings used in race engines across a wide range of motorsports disciplines, from sport compact and drift racing to oval track, drag racing, and land speed record applications. ACL Race Series bearings use a specialized tri-metal construction with a proprietary copper-lead alloy overlay that provides excellent load capacity, conformability, and wear resistance under the high RPM and cylinder pressure conditions of performance engines. Popular ACL Race Series Bearing Applications ACL Race Series bearings are available for main bearings, connecting rod bearings, and thrust washers across a broad range of American, Japanese, and European performance engines including Honda, Toyota, Subaru, Mitsubishi, Nissan, Ford, Chevrolet, and Dodge applications. ACL bearings are manufactured to OEM dimensional tolerances and are available in standard, 0.001-inch, 0.010-inch, and 0.020-inch undersize options to accommodate different crankshaft regrind specificati...
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