<html><body><div style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10pt; color: #000000"><div>I've some problems with a TR6 race engine : the engine is pinking and overheating. Compression ratio is 12.5. Comparing the cylinderhead of this engine with another 6 cylinder head (probably also from a TR6 , but from a Triumph saloon is also possible) : it turns out that my cylinderhead is lacking 5 coolant passages. My cylinderhead has only a passage just beneath outlet port no 6. The other cylinderhead has passages beneath every outlet port. I didn't know of this difference between 6 cylinder heads. Does anyone know which cars do have which cylinderheads? Can I add these passages on my cylinderhead, hoping for better cooling? I've been working on this engine now and then since 2 years. It belongs to a racecar a friend of mine has built. He has lost interest in this racing project and I bought the car. I'd like to see it on a racetrack some day.<br></div><div>Marcel</div></div></body></html>