Ok, washers arrived do I pulled the front first to measure, pics and compare.



The cometic and s &s on top are exactly the same size, but the s & s bottom is a lot more firmer.



the thread is 3/8 x 24 so I will tighten 14.5 flats past 0 lash.



Both nuts are 1/2" and the flat is 5/16.

Anyone know what brand this could be ?

 

Can you post a pic of the complete pushrod. They look very similar to Fuel-Moto's... Which are 24tpi.
https://www.fuelmotousa.com/p-28622-...-pushrods.html


As for the pushrod cover seals the S&S will be fine, just put them in their proper position and you shouldn't have any issue... Also make sure the washer goes in the lifter block first with the flattest side up...

 

While I don't know who makes those I know it isn't S&S.
The TPI is wrong for S&S.

 

Fuel Moto rebrands Smith Bros. Many consider them the best pushrods on the market, and if I ever replaced mine during lifter service, I would get them.

 

I don't believe Fuel Motto is still rebranding. The latest video I saw stated that Smith Bros. We're now making them for Jamie..