What are the exhaust valve spring tolerances for a A10 Cast Iron head ?, my Haynes book, which I am rapidly learning to distrust, states, minimum :
Inner spring 1 17/32" / 38.893 mm
Outer spring 1 7/8' / 47.625 mm
Are these numbers correct, I have two full sets of used springs and only one of the inner springs is within these specs ?, can they really all be that old ?.