Mickey Thompson lightweight hemi-head runs again...

[cjshaker]

The parting surfaces were also serrated ( saw tooth) like an aluminum rod was  back then. I still have a few from a small block Ford stroker I built in the'70s. A really odd 5.220 length.
   Randy

If you look closely at the shot of the rods, you can see the serrated mating surfaces. I thought maybe it was the one "new" concession to reliability, but maybe I was wrong.

[Jb427]

good pic's here of some of the goodies inside one https://www.hotrod.com/articles/hrdp-1008-mickey-thompsons-427-ford-hemi-engine/

[Stangman]

We had the same M/T rods in our 389 Pontiac and yes they are serated on the caps Doug.

[TomP]

I have some NOS Mickey Thompson aluminum FE rods, they use the Allen head bolts. A friend has an MT catalog that shows those steel rods amongst other cool stuff.
 That must be a big stroker. MT sold cast stroker cranks back then. The piston skirts wouldn't need that kind of clearance with a normal stroke.