small block ductile iron adjustable rockers

[moparbob71.2]

Hey Guys, I have a question about factory adjustables. I have a used original set that I pulled years ago. It has the banana groove shafts. the part number on the side starts with 24. I have another set that's slightly different that has w30 stamped on the side. I think Crane made iron adjustables in the old days so could the w's be Crane or something else?
Someone school me on these. I need to figure out what I've got so I can figure what to take to the Nats.
Thanks in advance:downtown:

 

[krazykuda]

I believe that TRW userd to make the adjustable rockers for the small blocks also.

 

[rumblefish360]

Crane still makes the Ductile rocker arms. Sorry I can not help from here.

 

[Demonracer]

Hey Bob,

You wouldn't by any chance have an extra set of the grovved shafts for sale, would you?

thanks,

Bill S.

 

[moparbob71.2]

Thanks all. I brought them to work w/ me. I'm going to go thru all of them and get numbers off the sides. I know 1 said w30 but another said something like w66. If I get it figured out I'll post the results. Keep the info coming!
Bob

 

[toolmanmike]

I think the W30 and W66 rockers are factory. They should also have a single adjusting nut with interference fit. Most aftermarket rockers had a adjusting screw with a jam nut. Here's a shot of a factory rocker. As you can see this one has a W74 stamp. toolman

 

[moparbob71.2]

Thanks Toolman! Yep, that's the ones. So my guess is the ones w/ the part number that begins w/ 24 are 1st year 273's. The ones w/ the W's, could they be for 340 t/a heads? or just a later 273 casting? Enquiring minds want to know........

 

[toolmanmike]

Thanks Toolman! Yep, that's the ones. So my guess is the ones w/ the part number that begins w/ 24 are 1st year 273's. The ones w/ the W's, could they be for 340 t/a heads? or just a later 273 casting? Enquiring minds want to know........

I have a 66 HP 273 and as far as I can tell it has the original rockers.