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Message: <blockquote data-quote="QIKGTS" data-source="post: 3840" data-attributes="member: 8149">I agree with everything posted so far...The 165 is a good head. It flows good and has a good combustion chamber, but also bumps up the compression quite a bit. Keep in mind that the 165 is really maxed out on a small displacement motor like a 302 or 306. If you are thinking about a 331 or 347 or even switching to a 351 later down the line, the 185 will be a better head in the long run. even though you will need to cut the piston. To tell you the truth, if you are going to do the head swap yourself, you have the ability to cut the piston. I don't think it's that tough with or without the tool. A good carbide tip on a die grinder should make easy work of it.If you trade for the x head, make sure they pay you some good cash (I would take no less than $500 if the x heads are used) too so you can upgrade the valve train and get the exhaust ports opened up. The TW rocks as we all know, but you will need to cut the pistons for them to work also.Just my .02 as usual...</blockquote>