you need to grind that much out is that with your .060 add to that ? or is that just to get it to turn. i have had to take that much out but be careful some blocks do not work good for stroking and you may hit water, i use a rod or some thing you can run it in the water jack by the cylinders mark the rod with a pen at the deck of the block. pull it out and hold it inside of the cylinder walls with your mark you made up top. line up to the deck this will tell you how thick the block is at the bottom of the block make shure you brake all sharp spots off the cylinders wall or this will hurt the pistons skirts. use some sandpaper by hand or a sanding drum i hope this helps