Hiya Neil, I haven't been on board for a while, but was funny I was looking in my 'Hayes' the other day, and read the anti-induction blurb yet again and it's almost an official admission that the ports are not profiled very well, which I noticed on mine a while ago, and acted accordingly.
That was when I bought a Dremel,and utilised the profile gauge I already have, and did some 'sculpting'; ie evened up the internal profiles of in/ex ports
Not sure yet how effective it'll be but can't be too bad, I fired it up the other day for the first time in many fingers years ago, but the bottom line in my opinion is that the 'bias' is a crock of crap and just a cop out for the factory for not casting the heads well- I could be wrong, but that's me, so when you have a chance strip it down and have a check. (not much time for 4 days leadup)
cheers, duTch
I'm up in sunny/floody/?let me check?
Qld