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.
Combustion Chamber Volume (cc): 115 cc. Intake Runner Volume (cc): 300 cc. Exhaust Runner Volume (cc): n/a.
Spark Plug Style: Standard Location. Intake Valve Diameter (in): 2.250 in.Exhaust Valve Diameter (in): 1.880 in. Valve Stem Seals Included: No. Rocker Arm Studs 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 Seat Machine Style: 3-angle. Valve Seat Material: Ductile Iron. 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\Engines & Components\Cylinder Heads & Parts".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, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Gibraltar, Guadeloupe, Iceland, Jordan, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Martinique, Maldives, Nicaragua, Oman, Peru, Paraguay, Reunion, Viet nam, Uruguay.