Adjustable rocker identification?!

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vntned

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So I own 5 different sets of adjustable rockers for SBM LA engines. One set are original Mopr W2 iron rockers.One set are aftermarket iron adj. rockers with roller tips. The other three sets are regular LA adjustable rockers, but all three are different from one another. One set is standard 273 with non-bushed rockers and non grooved shafts. One set is 273 rockers with brass bushings and grooved shafts. The other mystery set is non-bushed with non grooved shafts, but they are very different and have different spacers as well. Can somebody explain the oe 273s vs the bushed 273s, and hopefully help identify the other set I’ve got?!

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None of those are original 273 rocker arms. The 273 rocker arms did not use a lock nut adjusting screw setup. They had the variable thread adjustment screw that was an interference fit.
 
No casting #'s/logo? The spacers may be different, as not all heads are machined identical? Requiring different spacers?
 
The middle one in this picture is a Crane ductile iron rocker, looks just like the ones currently on my 340.

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I'm pretty sure the one on the left is a factory 273 rocker that's just had the adjuster swapped out, doesn't even look like they spot-faced the rocker for the lock nut either. Just swapped in a different adjuster.
 
First, I know next to nothing about small blocks, but....
Those could be 273 rockers with a spot face so that a lock nut COULD be used, maybe in place of worn out adjusters that can't be found. At least one set has had bushings installed.
Of course, they could be isky's (though iskys usually had his name on em) or Crane, or Sig Erson.
The adjusters with a screwdriver slot look like my maxwedge pieces, but I think the solid lifter 300s used them too. The big block adjustables used lock nuts.
if i were to make a bet.... Sig Erson.
 
33IMP said:
First, I know next to nothing about small blocks, but....
Those could be 273 rockers with a spot face so that a lock nut COULD be used, maybe in place of worn out adjusters that can't be found. At least one set has had bushings installed.
Of course, they could be isky's (though iskys usually had his name on em) or Crane, or Sig Erson.
The adjusters with a screwdriver slot look like my maxwedge pieces, but I think the solid lifter 300s used them too. The big block adjustables used lock nuts.
if i were to make a bet.... Sig Erson.
Click to expand...
What is a solid lifter 300?
 
The Letter car Chryslers, 300C, 300D etc. The optional engines sometimes had solid lifter cams, so adjustable rockers.
The wedge 300's would be the 300E, and up.
 
Well, only a handful of companies made them. Crane, Erson, Isky, Chrysler and believe it or not, Melling at one point offered a stock 273 adjustable rocker. I may be leaving somebody out. Seems like I always do.
 
33IMP said:
The Letter car Chryslers, 300C, 300D etc. The optional engines sometimes had solid lifter cams, so adjustable rockers.
The wedge 300's would be the 300E, and up.
Click to expand...
Not having studied the 300 series cars that much what engines did they have in them that had adjustable rockers?
273 or 318 poly, 413?
 
Jadaharabi said:
Not having studied the 300 series cars that much what engines did they have in them that had adjustable rockers?
273 or 318 poly, 413?
Click to expand...
413s. I think the last one, 300L might have had a 440. Never, ever, anything less than a 413 in the wedge Era. (55, 331, 56 was a 354 [First with more than 1hp/cube, in spite of corvette claim], 392 in 57, 58)
 
i didn’t take pics of the roller tip rockers or the W2s. Just the three LA non roller adjustables.

All the 300 cars were either Chrysler FirePower hemis, with iron adjustable rockers, or big blocks. They are not relevant to these rockers in my first post.
 
The only numbers I see are the numbers “380” on the sides of the rockers with the straight edge adjuster screw.
 
Heres pics of some i have. NOS Perfect circle with a "34"?? Maybe?
I also have some with 380 on one side and "W" with #'s. 380's are non bushed.

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