Belt 25mm BBC +.250/ +.400 Raised Cam

The Belt 25mm BBC +.250/+.400 Raised Cam (MPN: BEL-31060) is a precision timing belt engineered for Big Block Chevy engine applications requiring exact synchronization between crankshaft and camshaft rotation. This 25mm-wide belt is designed to accommodate raised cam installations with +.250 and +.400 lift specifications, making it essential for engine builders working with performance and stroker builds that deviate from stock cam timing geometry.

The raised cam offset geometry demands a belt designed specifically for those clearance and indexing requirements. Standard timing belts will not accommodate the geometry of lifted cams without risking belt skip or accelerated wear. This belt's +.250/+.400 raise specification ensures proper tooth engagement and consistent belt tension across the full range of engine operation, critical for maintaining valve timing accuracy in high-performance applications where even small deviations compromise drivability and power delivery. The 5.75-inch overall length and 1.4-inch width provide the dimensional fitment required for BBC timing cover assemblies configured for raised cam installations.

Buyers restoring or building Big Block Chevy engines—whether for street performance, drag racing, or marine applications—require a timing belt matched precisely to their cam geometry. Generic or incorrectly-specified belts introduce timing slip, which manifests as inconsistent idle quality, power loss, and potential valve-to-piston contact in extreme cases. This belt addresses that requirement directly for builders working with raised-lift camshaft profiles. Verify your specific cam lift specifications (+.250 or +.400) before purchase to ensure correct fitment with your BBC engine assembly.