Speedmaster 1.6 rockers

I suspect they are not the same as PRW because they have a different hold down . Most of the failures I've heard about with the PRW are to do with the shafts themselves. Early on they didn't have a hard enough shaft and I ate a pair of them which caused the bushings to go , lucky for me mine came from a reputable builder with a good relationship with PRW because I was sent a whole new setup from PRW .The new set are indeed stamped with the PRW logo and I will be installing a geometry correction kit as soon as it arrives which will increase the longevity .
PS I put 25k miles on a 520hp sb stroker before mine were toast and if you actually take the time to read what B3 has to say about roller rockers you will find these have better geometry out of the box than several of the high doller units .