23-12-2018, 09:47 PM
That looks like great work there. I would also be interested in the exact make up of your valve gear, including valve caps and springs, if you don't mind sharing. I've been using old style mini valves with machined down valve caps for a long time now . These valves work with British Leyland E series valve springs -none of these bits are quite as over-the-counter at the parts store as they used to be.
![[Image: 46385754772_5df10771f3_k.jpg]](https://farm5.staticflickr.com/4887/46385754772_5df10771f3_k.jpg)
BTW, I did the engineering and trackside on a blown Methanol fueled A7 single seater some years ago. Over several seasons racing it did seem to suffer more than its share of cracked blocks, I came to the conclusion that it was due to the massive difference in inlet and exhaust temperatures with alcohol fuel. The later 10 stud blocks for the blown works cars had a different shape to the exhaust port which allowed for coolant circulation around more of the exhaust valve seat circumference.
BTW, I did the engineering and trackside on a blown Methanol fueled A7 single seater some years ago. Over several seasons racing it did seem to suffer more than its share of cracked blocks, I came to the conclusion that it was due to the massive difference in inlet and exhaust temperatures with alcohol fuel. The later 10 stud blocks for the blown works cars had a different shape to the exhaust port which allowed for coolant circulation around more of the exhaust valve seat circumference.