Orrock was a South Sydney junior[2] and began playing first grade for them in the 1950 NSWRFL season when they won their first premiership in 18 years.
Orrock along with Wests hooker Hec Farrell were sent off for fighting, becoming the first players ever to be sent from the field in a grand final.
[5] Orrock played for St. George at front row forward in the 1956 NSWRFL season's premiership final, defeating Balmain.
[6] Orrock played for St. George at front row forward in the 1957 NSWRFL season's premiership final victory over Manly-Warringah.
[8] He finished his career in the country as captain-coach of Boorowa (Maher Cup), and in the early 60's, he coached Condobolin.