Four bolt mains

They won le mans with a side oiler
Basic Ford head problem even with the tunnel ports but bottom end was solid and heavy
Mickey Thompson solved the head problem- Hemi heads and the cammer
Mopar bottomeend was heavy too, longer rods and lighter pistons help but hemi dome is hard to get light :)
Mickey's hemi heads (Top Eliminator at NHRA NAtionals on a Pontiac) were designed so they could be drilled for most of the 4 head bolts per cylinder heads
olds, cad pontiac, ford FE Chrysler
not all were ever made but design was there