Cat Cams Camshaft 251°/253° – Audi V8 4.2L 40V QOHC (BCY)

Description

Cat Cams Camshaft 251°/253° – Audi V8 4.2L 40V QOHC (BCY) is a performance camshaft profile from Cat Cams, developed for the Audi V8 4.2L 40V QOHC engine. Cat Cams has built valvetrain components in Belgium for decades, and every profile is ground to motorsport tolerances rather than adapted from a generic blank.

Key Features:

• 251°/253° duration: an intake and exhaust profile matched as a pair, so the engine gains area under the curve without losing driveability.
• 9.65mm intake / 10.00mm exhaust valve lift: increased lift flows more air through the existing head without requiring further machining.
• Correct valvetrain match: ground specifically for the 8cyl QOHC 40v configuration, so it drops into the standard head.
• Made to order: ground to spec by Cat Cams in Belgium, so the profile arrives fresh rather than off a shelf.

Fitment:

• Audi V8 4.2L 40V QOHC – engine code BCY
• 8cyl QOHC 40v valvetrain

Camshaft changes of this size normally want matched valve springs and a revised tune to realise the profile fully — talk to us if you want the supporting parts specified alongside it.