Centaurus,
It's about the Wasps big brother but it's a good read.
"R 4360 Pratt & Whitneys Major Miracle" by Graham White.
Got it from
www.amazon.com (the american site)
Everyone seems to have their own opinion on this one. Flown Stearmans,Tiger Moths (inverted engine) and i always pull them through first. (no starter on tiger anyway)
Happy flying, would love a go in a DH Beaver.