XM 254/260 HRlrBBC

BBC - 1965-66 396 c.i.d. models have an oiling groove in the rear journal. The listed part numbered cams will not fit these models, so if you require a Camshaft with the oiling groove, please call us at 1-800-999-0853 or contact us, and we will assist you with placing an order. WARNING: Camshaft Optimized for use with a Melanized or Nitrided distributor Gear. Not compatible with cast or Steel Gears without similar surface treatments. Failure to utilize the proper distributor Gear will void all warranties and/or return policies.

Additional Information

Good in jet boat with B impeller with 10:1+ compression, running river drags or bracket racing.

Application Summary

Chevrolet GEN IV 396-454 Big Block Engines Originally Equipped with Flat Tappet Camshafts

Part Type

Engine Camshaft

Product Overview

*Xtreme Marine Camshafts*
• Extremely wide powerband helps get boat on plane while making maximum horsepower
• Work against exhaust systems with restrictive back pressure
• Power enhancement helps maintain top end speed for long distances
• Intended for applications where low idle speeds are required

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Product Details

Product Downloads

#	Document Type	Download
1.	Catalog

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Reference Information

Camshaft, Hydraulic Roller Tappet, Advertised Duration 308/314, Lift .575/.575, Chevy, Big Block, Each

COMP Cams Xtreme Marine camshafts take advantage of the newest developments in camshaft engineering. Their aggressive lobe design produces better throttle response and top-end horsepower than other cams with the same duration at .050 in., while delivering increased engine vacuum. These cams are available for everything from pleasure boats to race applications, so you can always enjoy Xtreme performance on the water. From hydraulic and mechanical, to flat and roller tappet, COMP Cams offers camshafts for your watercraft dating as far back as the 1950s.