Not sure how to tell the adjusters apart. I bought a set of Smith Bros to replace the adjusters on my 1.7 CAT rockers, and to lay them next to one another not sure you can tell the difference.
Once you have both, Smith Bros and Manton's for the same application you will see the differences. I found out the hard way about Smith Bros. versus Manton while dyno testing a motor with a custom set of Smith Bros. 3/8x. (was suppose to be) .120 wall ball and cup for a solid roller cam motor with under 700 lbs. pressure opened and less than 8000 RPM. One broke in the middle (after around 12 pulls) due to a flaw in the metal in the tubing at around 5600 RPM, it ended up bending the one beside it and a broke the top of the Crower solid roller lifter body off allowing both lifters to be pushout of the lifter bores completely, one of the broken pushrod pieces got down into one lifter bore and gouge the cam lobe bad enough to need to be repair ruining my day
I took the two broken pieces and the bent pushrod back to Smith Bros and was told by Pierre, he had taken my order originally and had them built for me. When he saw the broken parts he made the comment that they were .083 wall, not the .120 wall I had ordered and paid for
They built me two new ones and gave them to me for no charge but did not offer to help on fixing the cam
I order an identical set from Manton and took the motor with the Smith Bros. in it back to the dyno after getting the cam back from being repaired and it made the same power as the two runs before the pushrods failed. I swapped in the Manton's with no other changes and the motor made 8 HP more at peak HP RPM. I was and am a dealer for both, but I only sell Manton's now due to that testing and Smith Bros. not making what they say they made on special custom orders.
