SKU: 51039 | UPC: 084663510397
Moroso Ultra 350 8mm Multi-Angle Spark Plug Wire Set – Black (GM Big Block Chevy 366-454 HEI-Style w/o Coil In Cap)
The Moroso Ultra 350 8mm Spark Plug Wire Set is a premium ignition upgrade for GM Big Block Chevy (BBC) 366-454 engines equipped with HEI-style distributors without a coil-in-cap. These high-performance wires feature an 8mm silicone jacket with multi-angle boots for easy routing and a secure fit in tight engine bays.
The Ultra 350 wires deliver excellent conductivity, superior spark energy, and maximum resistance to heat, abrasion, and electrical interference. The black finish provides a clean, factory-like appearance while the high-quality construction ensures reliable performance under high RPM and high-heat conditions. Ideal for stock, modified, or high-horsepower BBC builds where dependable ignition is critical.
Key Features
- 8mm Ultra 350 Construction – High-conductivity core with excellent spark delivery
- Multi-Angle Boots – Allows flexible routing and secure connection in tight spaces
- Heavy-Duty Silicone Jacket – Superior heat and abrasion resistance
- Black Finish – Clean, OEM-style appearance that complements engine bays
- GM BBC HEI-Specific – Direct fit for 366-454 Big Block Chevy with HEI-style distributor (no coil-in-cap)
| Spec | Detail |
|---|---|
| Part Number | 51039 |
| Brand | Moroso |
| Type | Ultra 350 8mm Spark Plug Wire Set |
| Compatibility | GM Big Block Chevy 366-454 with HEI-Style Distributor (no coil-in-cap) |
| Wire Diameter | 8mm |
| Boot Style | Multi-Angle |
| Color | Black |
| Country of Origin | United States |
| Warranty | Moroso Limited Warranty |
Whats Included
- Complete Set of 8 Spark Plug Wires
- Multi-angle boots for easy installation
Product Notes
- Designed for GM Big Block Chevy 366-454 engines with HEI-style distributor (no coil-in-cap)
- Provides improved spark energy and resistance to heat and interference
- Professional installation recommended for proper routing and connection
Installation Notes
- Direct replacement for factory spark plug wires
- Route wires away from heat sources and secure properly
- Estimated time: 30–60 minutes
This Part Fits
| Year Range | Make | Model | Engine | Notes |
|---|---|---|---|---|
| Various | Chevrolet | Big Block Chevy Applications | 366-454 BBC with HEI-Style Distributor (no coil-in-cap) | 8mm Ultra 350 Spark Plug Wire Set |
Why Choose Moroso Ultra 350 Spark Plug Wires?
- High-conductivity 8mm wires with multi-angle boots for reliable spark delivery
- Superior heat and abrasion resistance for high-performance applications
- Clean black finish that complements classic and performance engine bays
Frequently Asked Questions
- Q: Will this wire set fit my 1970 Chevrolet Chevelle with a 454 BBC and HEI distributor?
A: Yes, it is designed for GM Big Block Chevy 366-454 engines with HEI-style distributor (no coil-in-cap). - Q: Are these wires pre-cut or universal?
A: They are a pre-terminated set specifically for GM BBC HEI applications with multi-angle boots. - Q: Is professional installation recommended?
A: Recommended for proper routing and to avoid cross-firing or heat damage.
Shipping & Handling
- Method: Ground UPS or FedEx
- Availability: In stock – ships same or next business day
- Packaging: Secure Moroso retail packaging
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