4 bolts to remove the jug after you take the muffler and carb off.. You need a long T27 torx head socket (or the T27 torx wrench that comes with the saws). Scoring on the cylinder will typically be on the exhaust side so you won't see it looking in through the exhaust port.
Bailey's is a good source for some of your major components. They have aftermarket cylinder heads, pistons as well as sprocket covers and recoil starter covers. www.baileysonline.com. I rebuilt a 460 using one of their Big Block kits about 12-15 years ago and the saw ran great.
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