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Author Message   Beardo Posted on Sunday, July 14, 2013 - 10:29 pm:        I'm not going to go balls to the walls with my S1. I snapped an exhaust stud and rather than fixing it. I'm gonna used it as an excuse to upgrade the heads.   Ratbuell Posted on Monday, July 15, 2013 - 08:11 am:        You do know that if you change heads, you have to change pistons too...right?   Beardo Posted on Monday, July 15, 2013 - 08:46 am:        I did NOT know that. I thought it was a straight swap, but HAD to change the pistons with the XB swap. OK, please disregard this post until further notice. I'm going to drill out the stud. If it goes awry, then my justification comes back into play. Have enough to play with for the moment with the darn swingarm. Thank you Rat for the information. Brian   Buelliedan Posted on Wednesday, July 17, 2013 - 04:00 pm:        actually with XB heads you DO NOT need to change the pistons but you would need a new billet front motor mount. With thunderstorms you need to change the pistons but not the mount.   Beardo Posted on Thursday, July 18, 2013 - 08:57 am:        Gotcha. Thank you for the clarification. I read prior information incorrectly.   Screamer Posted on Saturday, July 20, 2013 - 12:33 pm:        You can mill the Thunderstorm heads and use with (stock Lightning) flat-top pistons. Depending on how much you remove there may be additional components required.

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