What's the size of the standard spacer that came with the factory adjustable rockers? THX

to my knowledge they never came with spacers, used springs.

SB solids/adj rocker setup I am assuming. You need the width or the OD dia (or both)?

Both if you have it.

Its a good bit of work to get a 273 rocker config setup if your shooting for the most out of it.

OEM fitment is sad, I ended up with a set of thicker spacers and flatted them to the needed thickness.

Ive spacers from 1.115 to 1.130 od and have seen them in several widths.

I pinned the shafts before setting things all up and when you get them right they always need to be on the shaft on the same order.

Even the shaft hold downs vary a bit in width as well as the rockers themselves from oem, nos oem, to some packaged manleys which seem to be better finished oem units.

But when your done and they are setup with the only clearance is for expansion, its a good working setup.

Google it, there is alot of good info on fabo from others that went through all the pitfalls of using them although there is a much much easier fix to the oiling problem that really isnt a problem.

My experience with is with BB and aftermarket hold downs. On first mock-up, rockers were tight and not well positioned over the valves. I had some material milled off the hold downs for clearance and purchased a number of shaft shims. Shims were placed to center rocker tips over the valves and leave some moderate side clearance.

With that, a happy valvetrain.

Not sure when this is a problem, but the factory spring load assumes that the rocker will either have no side thrust at all, or thrust only against the stand shoulder.
If your pushrod angle or rocker offset induces opposite thrust, that spacer should have an oil groove similar to a connecting rod shoulder facing the rocker, like an "X" .020" deep. Material: 660 bronze would be my choice.
If I had nerves of steel I'd suggest a needle thrust collar ("Lazy Susan") for really high spring load, but IDK how fragile they are, and of course a failure (shower of hardened needle fragments going down the drains) is very bad.

OD-1.070" ID-.875 (7/8). Horizontle width-.353". What Bird said, there is alot of info on FABO if you want that rocker setup to be dead on. prepare to do alot of mixing & matching of parts/reclocking/changing orifices of the oiling holes in the shaft etc. reportedly those iron adj rockers are good.

These rockers were clearance and ratio adjusted for a stock eliminator cat that I had several years ago. Although defunked as a class, this is for a IHRA Pure Stock Dart that I am building. Thanks for all the input.