Alright looking to upgrade from my boat anchor E5 heads, was wanting to buy some gt40p's and was wondering what I could have a machine shop do to them to improve flow even more. Is there a safe amount I can have milled off without checking valve clearance ? Take it easy on me I lost my sight 5 years ago, I know this info is out there but I get on the net using my iPhone which has software that reads my screen to me but surfing the net is still real hard. If you don't wanna help and just tell me to google it, I'd ask you just move along without even posting. If you don't believe I'm blind check me out on Facebook Kevin coffey Cisco, ga