Beyea Custom Headers IDM-604-S1G IMCA/UMP Dirt Modified Header for GM 604 Crate Engine

The Beyea Custom Headers IDM-604-S1G is a high-performance 4-into-1 style header specifically engineered for GM 604 crate engines in IMCA and UMP dirt modified racing applications. These stepped headers are designed to maximize horsepower and broaden the power curve for competitive dirt track racing.

Key Specifications:

• Stepped primary tube design: 1-5/8 inch to 1-3/4 inch diameter
• 2-3/4 inch collector diameter
• 4-into-1 collector configuration for enhanced top-end power
• D-port exhaust port shape for GM 604 crate engines
• Constructed from durable steel with black paint finish
• Laser-cut flanges for superior sealing and support
• Includes gaskets for installation
• Sold as a pair

Chassis Compatibility:

• Fits Arrow, BMS, Elite, GRT, SSR, TDR, and Hoffman chassis

Beyea Custom Headers brings over 15 years of header fabrication expertise to the dirt track racing community. Each header design has been extensively tested and proven on tracks across the United States. The 4-into-1 collector style consistently delivers superior top-end power, giving racers the competitive edge needed to reach victory lane. Trusted by professional Modified and Late Model race teams nationwide, Beyea guarantees both fit and performance.