Look at why the cam appears to be noisy on the SRX6(well, Son thinks it is, I'm going to have to have a ride on it myself i think), but....while we had the engine stripped i did notice that the middle journal on the cam had signs of wear or 'pick up' possibly foreign object damage via the oil feed, Son seems to think it's that, i'm not convinced, it's such a beefy camshaft i can't see it whipping in the middle, not to that extent anyway.....but his question is...can the head be line bored and then 'shelled' ... and if it can...is it worth the aggro/expense??
Apart from that #4 looks a treat now, and make my #1 look a bit dowdy
cheers
steve