So I just picked up my gt40 heads today. Had the valve job etc done. I had the guy leave the springs off because I am going to change them. I think the seals might be the wrong way. There is a blue one and a black one. The question is which is intake and which is exhaust? Please chime in if you actuality know the answer. The guy is a good builder and was happy to give him my $ so I don't want to bother him about it.