These are large oval port cylinder heads with open style 115cc combustion chambers and 300cc intake runners. In addition to the nearly 80lb weight savings these heads offer over factory cast iron heads, they will yield about a 40hp gain over stock GM 990 castings. In unported form these heads will support 500+ horsepower on pump gas. If you are looking for a race grade head that is comparable to Edelbrock, Dart, Trick Flow, Pro Comp, or AFR at a fraction of the price look no farther then these. These heads are cnc machined and assembled by us. These heads work great on Caruretor and fuel injection engines and no special gaskets needed. The features of these are as follows. Cylinder Head Material: Aluminum. Interchange Part Number: See-301. Cylinder Head Style: Bare. Cylinder Head Finish: Natural. Combustion Chamber Volume (cc): 115 cc. CNC-Machined Combustion Chamber: No. Intake Runner Volume (cc): 300 cc. Exhaust Runner Volume (cc): n/a. CNC-Machined Intake Runner: No. CNC-Machined Exhaust Runner: No. Intake Port Shape: Oval. Intake Port Location: Standard. Exhaust Port Shape: Square. Exhaust Port Location: Standard. Spark Plug Style: Standard Location. Intake Valves Included: No. Intake Valve Diameter (in): 2.250 in. Exhaust Valves Included: No. Exhaust Valve Diameter (in): 1.880 in. Valve Springs Included: No. Damper Spring Included: No. Valve Stem Seals Included: No. Rocker Arm Studs Included: No. Rocker Arms Included: No. Rocker Arm Nuts Included: No. Valve Cover Mounting Style: Perimeter Bolt. Accessory Bolt Holes Drilled: Yes. Intake Valve Angle: 45 deg. Exhaust Valve Angle: 45 deg. Valve Guides Included: Yes. Valve Guide Material: Bronze. Valve Seats Machined: Yes. Valve Seat Machine Style: 3-angle. Valve Seat Material: Ductile Iron. Steam Holes Drilled: No. Oiling Style: Through pushrod. Machined for O-Ring: No. Notes: This head is not Speedmaster/Procomp E. 300cc Oval Port Cylinder Head. The item “Chevy 396 427 454 496 502 BBC Pair (2) Bare Aluminum Heads Oval Port 540 572 new” is in sale since Thursday, May 3, 2018. This item is in the category “eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Engines & Engine Parts\Cylinder Heads”. The seller is “apmachine44″ and is located in Fresno, California. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay.

• Manufacturer Part Number: sce301
• Brand: sce
• Warranty: Yes