I am re-building my engine which is a 1972 CP unit (in a 1974 CR car). This includes a new standard 150 hp cam (Newman) which is a straight replacement for the old one.
I was planning to re-use the double valve springs which appear to be in excellent condition. They have a vertical yellow stripe painted on each spring (see pic from before strip down). Does this signify anything, eg are they some sort of uprated spring and if so should these have been paired with a standard cam? Also they do not have any lower collars or spacers fitted. Is this correct? There was no wear on the head around the guides where the springs sat and the springs appear to have flat polished or hardened ends on the coils.
So my questions are:
1. Are these springs OK with standard cam and
2. Is it correct to have no lower collars or spacers.
Many thanks in advance for advice.