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I'm in the process of rebuilding my '87 Carrera 3.2L, and got a new 997 GT3 crank and oil pump (from William Knight), new 997 GT3 3.8L Pankl Ti pistons (130mm), 997 GT3 Cup intermediate shaft (slightly used), and 102mm P/C set from LNE. The pistons are custom made for the longer crank and rods. I'm changing the rod bolts to stronger ARP bolts, due to heavier pistons than the GT3. I got a set of "crazy" cams from Elgin, with 325 degrees inlet and 318 degrees exhaust with high (cant remember on top of my head) lift. My worry is that there might be a too tight clearance between pistons and valves... My engine builder did the math, and figured out it should be OK. However, he wants to assemble the engine and measure the valve to piston gap (and compression), and then machine out bigger valve pockets if necessary. However, if the pistons and valves collide, and there is not enough material in the pistons to be machined, would it be possible to put spacer rings on the cylinders (on the case side or the head side) to increase the gap?
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