I have two cylinder heads. One is a Honda type 18cc head with 25/24 mm stainless valves. The valve stem on these are 5.5 mm. Now all of a sudden I'm reading that the stock head style that came on my engine is a preferred head because of the 27/25 mm valves with 5 mm stems and automotive retainers. What is the reasoning behind this? Would bigger valves benefit me more that a milled head with smaller, stainless valves? I am currently building a 7000+ RPM motor with 26 lb springs, BP2 cam, billet flywheel and rod, chromoly pushrods, heavy duty retainers/keepers with lash caps, CNC bored carb.
What's everyones thoughts on this?
What's everyones thoughts on this?