Four men who flew to Western Australia and tortured a Perth drug dealer, leaving him permanently disabled, have received lengthy jail terms.

Gary Visanich, 43, was lured to a house in Bentley and assaulted over a number of hours by Cyril Mansour, his brother Serj, Andy Mannah and Niraj Singh, who all flew to Perth from Sydney in November 2011.

The four men spent less than 12 hours in Perth on a trip that was organised by Cyril Mansour to recover a drug debt of up to $150,000 owed to him by Mr Visanich.

Mr Visanich suffered multiple injuries including burns and severe lacerations that were contaminated with dirt.

Cigarette butts were also found deep in his throat.

After being attacked, Mr Visanich was driven to a nearby park and dumped beside rubbish bins.

He was found by passers by.

District Court Judge Julie Wager said Mr Visanich could no longer live independently and could not look after himself without supervision.

Judge Wager described what was done to Mr Visanich as "degrading", "disgusting" and "cruel".

"It is that chilling that you made the premeditated decision to fly-in and fly-out and behave in this manner," she said.

Judge Wager said Cyril Mansour was the "principal offender" who had sent threatening text messages to Mr Visanich in the days before he was assaulted.

She also said he recruited the other three men to take part in what she said was "their joint criminal enterprise".

Cyril Mansour was sentenced to 12 years' jail, while his brother Serj and Mannah were each given eight years.

Singh was sentenced to nine-and-a-half years.

A fifth man who dumped Mr Visanich in the park was sentenced to two years and nine months in jail.

The men were arrested in dramatic circumstances in Sydney about three weeks after the assault and extradited to Perth amid tight security, which was also put in place for their sentencing.

The men sat in the dock, which was enclosed by glass, and state security officers sat in the body court near the judge, prosecution and defence lawyers.