Celtic keeper Forster will enter the record books if he keeps his goal in tact for the first 31 minutes of the champions' game against Hearts at Tynecastle in the Scottish Premiership on Saturday.
That will take the Englishman to 1,156 minutes, edging ahead of the mark set by former Scotland international Clark during his time with Aberdeen in season 1970-71.
Forster will then set his sights on the British record of 1,311 minutes set by Manchester United's Edwin van der Sar five years ago.
The 'Great Wall', as he is known to Celtic fans, has kept the opposition at bay for 12 league matches dating back to November, but Sky Sportspundit Walker insists it does not stand comparison to Clark's heroics of the early 70s.
Speaking to Sky Sports News, the former Celtic striker said: "Back then, the competition was much stronger.
"Celtic were regularly getting to the latter stages of the European Cup, they even got to a final in 1970, Rangers won the European Cup Winners' Cup in 1972 and they, and Hibernian, were really strong too.
"So Bobby Clark's record is really impressive but take nothing away from Fraser Forster and what he has achieved at Celtic.
"He is set to join a long line of keepers currently playing in the Barclays Premier League who have experience of playing in Scotland.
"Allan McGregor, David Marshall, Tim Krul and Julian Speroni have all played in Scotland and have gone on to bigger and better things.
"I'm sure Fraser will probably move on from Celtic pretty soon and I have no doubt he will do a good job at the top level down there.
"It is a great achievement to be closing in on the record but I am sure Fraser would be the first to admit it is not just down to him.
"He has a really solid defensive team in front of him and he gets a lot of protection. But he does it time and time again and has also been very impressive in the Champions League.
"Of course he can be idle for long periods playing for Celtic but his level of concentration is very high and he can still come up with a vital save to ensure his team keep a clean sheet.
"He has great ability and I know there is talk of whether he should be in the England set up. I'm sure Joe Hart will be the first choice for Roy Hodgson in the summer but if Forster was given a chance, I don't think he would let anyone down."
Check out if Fraser Forster can set a new Scottish clean-sheet record against Hearts at Tynecastle live on Sky Sports 2HD from 12.30pm this Saturday.