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zh Decoding SBC Crankshaft Casting Numbers with TDK Innovations
2025-04-03 17:02:00 hits：0
This guide breaks down the secrets behind SBC crank casting numbers, helping you quickly determine crank type, vehicle application, and modification possibilities.
I. The Key Information in SBC Crank Casting Numbers
Each casting number typically consists of 6-8 digits with optional letter suffixes (e.g., X). The core information includes:
Stroke Length: e.g., 3892690 = 3.48", 3951529 = 3.75"
Journal Dimensions: Main and rod journal diameters define engine compatibility
Material & Process: Forged (e.g., 3782680) vs. cast (e.g., 3911011) construction
Vehicle Application: e.g., 3815822 = 1967 302 Z/28 with special flange design
II. Key Casting Numbers Quick Reference
| Casting # | Stroke (in) | Years | Application/Features |
|---|---|---|---|
| 3782680 | 3.25 | 1962-1967 | Forged small journal, fits 283/327 engines |
| 3911011 | 3.25 | 1968-1973 | Cast large journal, common in trucks/passenger cars |
| 3932442 | 3.48 | 1969-1985 | Cast large journal, fits 350 engines (watch for confusion with similar numbers) |
| 14088532 | 3.48 | 1986-1988 | Forged one-piece rear seal, used in LT engines |
| 3951529 | 3.75 | 1970-1980 | Cast large journal, external balance for 400 engines |
III. Common Issues & Identification Tips
Number Confusion & Verification
Digits 3/6/8/9 are easily misread due to casting imperfections
Cross-verify last 3-4 digits (e.g., 442) with journal measurements
Performance & Compatibility
Forged cranks (e.g., 3892690) offer superior strength for high-RPM builds
Cast cranks (e.g., 3932442) provide cost-effective daily driver solutions
Match internal/external balance systems to avoid engine damage
Rare Collectible Models
3815822 (302 Z/28 exclusive) and 3941188 (high-performance forged) command premium prices
14088532 (one-piece rear seal) marks late-80s engine advancements
IV.
SBC crankshaft casting numbers hold the key to unlocking your engine's full potential. By mastering these codes, you can accurately assess compatibility, uncover hidden performance gains, and even discover rare collectible models. Whether restoring a classic or building a high-performance machine, decoding casting numbers is your first step to success.
Tiegu is a leading manufacturer of precision-engineered castings for automotive and industrial applications. With over 18 years of experience in sand casting, investment casting, and CNC machining, we specialize in producing high-quality crankshafts, cylinder heads, and engine components. Our ISO/TS 16949-certified facility ensures strict quality control, while our engineering team provides customized solutions for vintage restorations and modern performance builds. Visit tieguexport.com to explore our capabilities and request a free casting analysis.
