Someone who understands this, please take the time to reply.
I posted this question the other day but hit a dead end and am still seeking knowledge: http://www.stovebolt.com/bboard/cgi-bin//ultimatebb.cgi?ubb=get_topic;f=2;t=000008
I'm very puzzled to understand why GM went through the trouble to beef up the 261 valve springs and change guide heights if it makes no difference. I'm convinced they didn't do it just for the fun of designing, buy, stocking and using no-value-added part numbers parts in the factory.
