Yes, identify clutch parameter, but also try to learn about the significant differences. I am looking to use it on a hemi motor build. So I am studying Flywheels and clutches. I understand FW differences in diameter and bolt pattern etc...
In looking at the service manual for 70-71 only the 318 and 340 got a 10.5" pressure plate with 11 5/8" bolt pattern. 318 9 springs, 340 12 springs. But both got 6 rollers. Disc was the same for both. with 10 springs 5 +5
The 383/440/Hemi got the 11" Scalloped clutch. The 383 same 12 springs as the 340 and 6 rollers.
The hemi got 12 springs but only 3 rollers. The 440 same hemi springs, but 6 rollers. Both used the same disc with 5 plain springs. What is interesting is they got a disc with less surface area then the 383. 11" OD, but the ID was 6 1/2" for 383, but 7" for hemi/440
I know that Mopar used the 10.5" clutch for the super stock cars. Plus plenty of the clutch manufactures make both for the hemi. 10.5 or 10.95.
So here I have clutch with no model identification, 12 springs, 3 rollers, 10.5" plate, 11 5/8" bolt pattern, and 23 spline disc at 10.5" with 5+5 springs.
I realize if a patent has run out the design can be used by others, but Borg and Beck seems to still be an active company so I assume if the housing has that stamped in it, it is made by them, or under license?
Here are pictures. Thanks for the help