Mine were untouched when I bought them, they were all 66-67ccs. After hand porting they are 70.
Ok, that 63cc is what seller told me. And they are RP heads. If we look at just flownumbers (SDSS),and compare w5 stage 3<->360-1RP flownumbers, they are almost identical. Both heads is flow tested in same bench by Ryan J. But how big is w5 intake runner after stage 3 port job??230-240cc?? That w5 is another head option, but hard to find unfortunately.
