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Message: <blockquote data-quote="BigTang" data-source="post: 859379" data-attributes="member: 10950">using the old valve is a PITA if you can't get the paper to stick to the valve. I used it for a guide to make an impression of what I needed to cut then I used an air sander to cut out the relief on the piston. Took about 15 mins a cylinder to do including checking and cleaning.here's pics from when i did it. I came back and hit it w/ the air sander to knock down the sharpness and get it out closer to the cylinder wall and I laid the relief back some for more radial clearance.<img src="http://i204.photobucket.com/albums/bb128/tealm0nsta/90/engine/DSCF5517.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i204.photobucket.com/albums/bb128/tealm0nsta/90/engine/DSCF5521.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i204.photobucket.com/albums/bb128/tealm0nsta/90/engine/DSCF5522.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i204.photobucket.com/albums/bb128/tealm0nsta/90/engine/DSCF5524.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i204.photobucket.com/albums/bb128/tealm0nsta/90/engine/DSCF5516.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i204.photobucket.com/albums/bb128/tealm0nsta/90/DSCF5552.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />of course I did this w/ my performer heads then swapped to the Z304 w/ the same 2.02 valves but the intake valve was moved so I lost a little clearance and couldn't run my cam 242/248 .612 and got pissed and just put the stocker in it.</blockquote>