Narromine is dressing up for its biggest week in rugby union after an undefeated season with local shops backing the Gorillas with banners and posters.

Three Rivers Machinery's Sharyn Brown says the community is right behind the local team for Saturday August 30 Grand Final Day.

''They have made the community proud and we are so excited for them," she said.

''It’s a big week for Narromine with the Show also on Saturday Aug 30."

A bus will go between the Narromine Show, Hospital and Golf Club.

St Augustine School has produced a video of school children backing the Gorillas.

(3) Facebook [St Augustine's School]

The Courthouse Hotel is also gearing up for a big after-party and the Soul Food Depot are also among big supporters.

Narromine's rich sporting history is being channeled by the all-conquering Gorillas.

Olympic star Melinda Gainsford, Australian fast bowling legend Glenn McGrath, Australian rugby league great David Gillespie and Wallaby rugby star Pat McCutheon are all part of the town's tapestry with a statue of McGrath in the main street.

Gorilla's No 8 Ollie Kearney says McCutcheon has helped his team in the lead up to Saturday's big match.

''He's given us good advice and helped with training drills and is inspiring.''

Narromine on the attack, ready for the grand final.

Mudgee stands in Narromine's way playing their best match yet and going close at 25-22 in their last meeting but with the hometown advantage at Cale Oval Ollie says the Gorillas are ready,

''We are keen and good to go and while favourites we are taking nothing for granted.''

He says a winning culture across both sides has firsts and reserves in grand finals.

''We are great mates and gel together. Mudgee have showed they're up for this so we need to begin the match well.''

He said the community backing and mateship can be motivation enough for the grand final showdown.

Narromine forward Hamish Job says its a massive opportunity for his town, ''The whole town has supported us and final training was fantastic, we're pumped.''