Has anyone used Ultima roller rockers on their build ??im doing a 124ci witch a zippers 657 sprocket cam
curious for the replies but have a good feeling on what the reply’s will be

 

I'd be nervous about them - I've had S&S in mine for years

 

I've run them in a 131 ci motor with SnS 640 cam for about 20K. I also ran them in a 95 ci motor with W8/ Crane H290 / Andrews 55 for 50K. My FXDX has them with a woods 9B only a few hundred miles.. They work fine but the early ones had an issue with the bushings wearing uneven. I replaced them with new bushings and that what's in the FXDX right now. I think on the newer ones, they are line reaming the bushings so they should work better.

IMO they have a little bit better geometry than the SnS. The roller centers over the valve better especially if the valves have been sunk pretty deep.

 

Is the Ultima quality getting better?

 

As far as bushings go, yes. The rest is the same..

 

Thanks, I was wondering - I'm going to need a new motor soon & the Ultima parts -cranks etc. cost a lot less the S&S