Maybe not much, but it does to me. When the originals were not concaved. Probably wouldn't notice the difference in compression, but if already loosing a little compression with a valve job I don't like loosing just a slight amount more with the valve head. IH ones are not that much higher but with none in stock at the dealer to look at, can't know if They are the same as originals or just the same as aftermarket.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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