BBC PERFORMER RPM 454-O CYL. HEAD BARE.
EDELBROCK 60449

BBC PERFORMER RPM 454-O CYL. HEAD BARE.

Performer RPM 454-O These oval port heads will support over 540 hp with 9.5:1 compression when used as part of the Total Power Package Unique oval intake port shape produces flow similar to rectangular ports, but the smaller port size provides excellent seat-of-the-pants performance and crisp throttle response Semi-open chamber design maximizes efficiency with streetable compression ratios Smaller-than-stock 11/32" valve stems promote excellent flow and lighter valve weight Cylinder Head Specifications

Combustion chamber volume 110cc Intake runner volume 290cc Exhaust runner volume 110cc Intake valve diameter 2.19" Exhaust valve diameter 1.88" Valve stem diameter 11/32" Valve guides Manganese bronze Deck thickness 9/16" Valve spring diameter 1.55" Valve spring maximum lift .700" Rocker stud 7/16" Guideplate Hardened steel Pushrod diameter 3/8" Valve angle 26 Exhaust port location Stock Spark plug fitment 14mm x 3/4 reach, gasket seat Made In USA

Technical Notes: Match with Edelbrock head gasket sets. Bare heads will have valve guides and seats installed, but will require final sizing and a valve job to match the valves you will be using. Recommended spark plugs 14mm x 3/4" reach with flat gasket seat (Champion RC12YC).