These are new, and suppose to fit a 324 Olds, which should make them 1.8 ratio. There is no name on any of the rockers. Does anyone know what brand they may be? They were sold a aluminum but I seriously doubt that, more like mag. Is there a way to check the rocker ratio?
They resemble a set of Thomas magnesium rockers that I've got. You say there is no name on them; are there numbers and/or letters of any sort? Thomas usually had something like "C 8" for Cadillac V8, or "O 8" for Oldsmobile.
On the ratio question---I assume that you've still got the stock rockers for the engine. First, see if your mystery rocker arm fits the shaft; if they're about 1/8 inch larger in diameter, they're probably Cadillac. Next, put it on the shaft next to a stock rocker arm and see how the two points of contact (valve tip and pushrod tip) line up with each other.
Check the shaft size,They look like caddy rockers, Be careful with mag rockers,you need spares when using them Tony
How serious of a problem is this Mag. material? Several posts have talked about breaking. This will be a cruiser engine....NO racing pretty conservative. Does anyone still think this will be a problem?
I got over to check the rockers. As the photo showed there is a bushing in them. The i.d. is .794 or there abouts. My shaft is .793/.794 at the end (stock rockers are still on my shaft) so I would say these will fit the Olds. Now, that said, I have seen Thomas rockers without a bushing listed for Olds. The o.d. of the bushing or the bore of the rocker is .913/.914 as best I can tell. Could this be the bore for the Cad.? If so, could someone have put the bushings in to make them fit the Olds? This is all new to me so I am learning as I go here. I will check one on the shaft and see if the push rods and valve contact point line up with the stock rockers...that will be Monday's project.
checked one on the shaft and looks good. I also got a set of new shorter push rods with the rockers. I needed the shorter push rod to install the adjustable rocker.
be very very sure to have the arm ON the shaft, shaft ON the stands, and stands ON the head and look at the rockers relation to the push rod hole and valve stem tip.. if they are infact bushed caddy arms the geometry will be off.. not real noticable but a close look will show it... they look awful lot like the Thomas SBC shaft mounted rocker arm conversion ones.. which have EXTREMELY SIMILAR dimensions as an Olds rocker arm.. already been through that in another thread.. but with out the numbers or markings on em there is no way to tell... anyhow.. check check and double check.. http://www.jalopyjournal.com/forum/showthread.php?t=445230 trust me, i almost used stude rocker arms believing the theory that they worked for both cad and olds.. till i mounted them and got to lookin and they were off in the geometery.. have been on the hunt for adjustable olds rockers for a couple years.. they are true unobtanium.. thank god i finally had a stroke of luck and found NOS McGurk's in the 1.5 ratio i needed. which brings me to my next point.. what year is YOUR engine? before you try to run them make sure you have the corresponding ratio rocker stands.. you said its for a 324 but that doesnt mean jack when talking of speed parts, as they came in 1.8 and 1.5.. 1.5's were widely used and needed on alot of drag cars to help ease the cam lift on the valve springs and prevent coil bind and what have you.. do some home work before you try slapping those on!
is that an aluminum rocker ?? and does it have a bushing in it ? i just spoke with a buddy's Dad about machining up new bushings and machining some very old adjustable aluminum rockers to fit the bushings
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