BBF Xtreme Hydraulic Cam X4278H

The BBF Xtreme Hydraulic Cam X4278H from COMP CAMS is a high-performance camshaft engineered specifically for big block Ford engines seeking aggressive street and strip performance. This hydraulic flat tappet design delivers the duration and lift necessary to transform stock engine breathing characteristics, making it ideal for engine builders and mechanics upgrading carbureted or early fuel-injected big block Ford platforms. Whether building a 427, 454, or other displacement variant, this cam unlocks cylinder head potential that factory valve timing simply cannot achieve.

With intake lift of 0.574 inches and exhaust lift of 0.580 inches paired to 278 and 288 degrees of duration respectively, the BBF Xtreme Hydraulic Cam X4278H creates substantial valve overlap and extended valve events across the RPM band. The 111-degree lobe separation angle (LSA) balances cylinder scavenging with intake charge retention, optimizing torque production from 2000 RPM through the 6200 RPM power band peak. Hydraulic flat tappet design eliminates the need for solid lifter conversion, preserving conventional valve train geometry while delivering reliable actuation and self-adjusting lash compensation that simplifies tuning and maintenance.

This camshaft suits builders prioritizing responsive mid-range power and top-end flow without gutting low-end torque—critical for street-driven big block Fords and dedicated performance applications. Installation requires proper valve train geometry verification, rocker arm ratio compatibility confirmation, and pushrod length calculation to ensure consistent lash across the entire RPM range. Pairing the BBF Xtreme Hydraulic Cam with matching valve springs, lifters, and pushrods ensures longevity and consistent performance; verify your cylinder head casting and intake manifold clearance before purchase to confirm fitment.