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[Backroads3]

 I replaced the 110" with a 120ST 37,000 miles ago. I've got what seems to be a prominent top end rattle mostly noticeable around 2200RPM. I read about Rockout rocker shaft inserts to help with top end rattle but wanted to ask if anyone has done this type or ideas on what could help. I have a 2010 FLXSE with 187,000 miles, had the trans gone through at time of engine swap and checked fasteners etc.

[HD Street Performance]

The shafts can move and rattle but not in every case. That motor has some serious spring pressure, me personally I would change the springs and lifters. That said first question, is this rattle you hear worse hot or cold?

[ultra13]

Rocker Lockers helped my noise......

[Backroads3]

Thanks for the replies. The noise is about the same hot or cold.

[HD Street Performance]

Try the lockers

[Backroads3]

I'll give them a try and let you all know the results.
Thanks!

[Backroads3]

I put the lockers in and it did help with the noise but unfortunately came back even worse. Upon inspection both cylinders were scored and the engine needs a total rebuild. At 40K it's very disappointing to say the least.

[HD Street Performance]

And easily explained. Consider different pistons, not Wisco (HD) slipper skirts. KB forged, line2line coated pistons are a better alternative and using S&S cylinders to get to 124". It takes some juggling because the 120 rod is shorter than stock. Not a problem for an experienced shop.

[ultra13]

Sorry to hear this!