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Message: [QUOTE="Zeb, post: 1544373, member: 30304"] 3.87 is the standard bore. When you get the Mahle pistons it will have what the bore size for the pistons on the box. Mahle recommends going 0.001”-0.0015” looser for a performance application. I like to see 0.0045”-0.005” piston to wall clearance. As far as protrusion, no, you can’t use the stock pistons. You have to measure it with the pistons you plan to use because block deck height and piston crown to wrist pin measurements all factor into piston protrusion. If you have block deck height and piston crown to top of wrist pin hole measurements I can get you really close on how much will need to come off the top of the pistons. [/QUOTE]

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