I bought a set of newly rebuilt 915 heads off eBay many years back and hadn't gotten around to them until now.
I just measured the exhaust valves and found they are 1.60" !
I thought all 915's were the onetime castings used in the '67 HP 440's and had the 1.74" exhaust valves ?
I guess I'll have my machinist install the bigger valves.
Despite the smaller exhaust valves that came with these heads, are the ports still the better flowing ones ?

Thanks in advance.