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Message: <blockquote data-quote="glittle75" data-source="post: 554291" data-attributes="member: 8675">you don't need to take them off as long as you can work in the tight space behind the driver side head. to answer your question, yes, there is no difference between a "right" and "left" head. the difference is where the plugs are places in the head oil holes. the tensioners are oil-fed. if you need a reference, you can take your old non-pi heads and set them so they are orientated like they are on the car. then look at the plugs and make sure they match up. if not, take the plugs out of your old heads and swap them over in the same holes. pretty much every oil hole on the back of the head (the side that sits toward the firewall, respectivly, needs to be plugged. there are no oil lines coming out the back. and the only thing that gets oil from those hole is the tensioners. and yes you MUST ENSURE that they are plugged, if not you will have oil everywhere as soon as the pressure comes up to the heads. if you dont have the 'warm and fuzzzy' feeling on startup, have someone watch the back of the heads on startup, it wont take but a few seconds for it to piss out if its not plugged right. post again if you need to and I can take some pics of spares i have. i have a set of NPI and PI heads with al the plugs in place in the garage if needed.</blockquote>