The valve seats are excellent, not machined or lapped in far for excellent compression, valves are original 46mm intakes and sodium filled 40mm exhaust valves, same as the 73 Porsche 911 Carrera RS had, ports are large 38/38mm beautifully ported and polished, valve springs are new Aase Brothers /Aasco Motorsports with light weight titanium retainers, spark plugs are both 14mm for an easy selection of plugs, the heads have been chamfered/beveled for 86.7mm cylinders – these heads are perfect for your screaming 2.5 liter 911 engine. They were built for a 914-6GT 2.5 liter spare engine and plans changed. Freshly plated studs are included – not shown in the photos. Casting numbers for the heads are: 911.104.306.0R, they are the more desirable flatter combustion chamber that 2.2, 2.4, and 2.7 liter engines shared. Please check out the photos! These are fantastic heads. Please check out our store for many nice and rare engine components, wheels and other desirable Porsche and RUF parts. The item “Porsche 911 2.5 914-6 GT ST RS Twin Plug Cylinder Heads Refurbished Ported 38/38″ is in sale since Friday, December 1, 2017. This item is in the category “eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Cylinder Heads & Parts”. The seller is “bengel512″ and is located in Corry, Pennsylvania. This item can be shipped worldwide.
- Brand: Porsche
- Warranty: No Warranty
- Country/Region of Manufacture: Germany
- Fitment Type: Performance/Custom
- Manufacturer Part Number: TBMS2.5TP