These stiffer valve springs alone will extend the revving capabilities of your valvetrain to the 8,000 rpm mark. In addition, the SportTuned valve spring set will eliminate potential coil bind on high lift cams. When properly installed they will allow up to 0.500 inches of cam lift. A good idea for any high performance engine. Designed to fit stock retainers. Remember: Always keep the lower valve spring seats in your cylinder head to prevent damage to the aluminum casting. 12V VR6 spring sets include required shims for proper installation.
The performance potential of your engine is limited by its ability to breathe. This is a function of valve size, among other things. We feel that these intake and exhaust valves represent the optimum for the present size cylinder bores in use. They're the same valves that we use in our SportTuned Zylinderkopfen. They are high quality Original Equipment (OE) valves made by the same suppliers to most German car manufacturers
Petes Automotive Products Private Limited
The International Hotel, P B No. 3563 M.g. Road, The International Hotel,, M G Road,
Kochi-682035, Kerala, India