Mark R:
My dad had two Guy Big J eight wheelers that were ex William Hamptons. They came with Rolls Royce engines but due to reliability issues they were replaced with ■■■■■■■ 220s.
My dad didn’t have much good to say about them other than they were absolute flying machines.
Thanks for the comments “Mark R” about your dads eight wheelers. Pics ■■? 
Heres a spec sheet for a rolls one.
