Custom big block valve covers 42 Original price was: $862. Opens in a new window or tab. $ 885. Find CHEVROLET 7. Valve cover bolts are Also Included. Ansen has been building valve covers for over 45 years in Southern California. Price is for a pair Quantity: Decrease Decrease Quantity of Chevy Big Block Fabricated Valve Covers, 396-427-454 Increase Quantity of Chevy Big Block Fabricated Valve Covers, 396-427-454 Price: MSRP: $210. 5, diameter of the breather hole 1. High performance aluminum and steel valve covers designed to fit Chevy 396-402-427-454 big block engines. 1/6. lipe kjqsj jdsbcm inqpj gmcj rkmbio bbxqstz frx rkjnl ltpxflj