England are no closer to identifying their third seamer for the first Test - unless Boyd Rankin and Chris Tremlett bowled themselves out of contention on the opening day of the Ashes tour.
The two giants spent much of the WACA Chairman's XI innings searching in vain for a length capable of quietening a top order that relished session after session of wayward offerings.
Queensland guest batsman Chris Lynn hammered an energetic century, Marcus Harris and Luke Towers produced the best opening stand by a WA pair in more than five years and the returning Mitch Marsh suggested that he could flower with the bat this summer.
The WA XI finished the first day of the campaign on 4-369 and lived up to coach Geoff Marsh's vow to make things hard for England.
Perth-born but England-qualified Jim Allenby, who said recently how disappointed he was to have been overlooked by the England selectors, made a point with his patient unbeaten 34, while Ashton Turner (17 not out) had a bright cameo at the end of the day.
Harris (69) and Towers (77) had a partnership of 115 that was the first century stand at the top of the order since Chris Rogers was with the Warriors in 2007-08.
But for all the crispness of their stroke play, the duo were gifted numerous runs as each member of the England attack, bar senior quick James Anderson who is the only guarantee for the Gabba, battled for control.
The batsmen struck 56 boundaries and two sixes to enjoy their day's work. Rankin provided the loosest of the offerings, including several consecutive full tosses in his opening spell that Harris used to hammer several of his 13 boundaries.
Steven Finn may be the favourite to partner Anderson and Stuart Broad in the first Test and found his bearings quicker than the other candidates.
Finn was also unlucky when he produced one of the best deliveries of the day that leapt at Marsh before his flat-footed poke burst through Joe Root at slip.
On a surface that had little pace after Perth's cool spring, and an absence of sideways movement to assist the seam bowlers, the local batsmen were rarely tested.
Lynn was seconded to the XI after being left out of the Bulls' Sheffield Shield team and was the pick of the batsmen in his return to first-class cricket after an 18-month absence.
He missed most of last season with a groin injury but had little hindrance in easing to his fourth first-class century, thrashing the England attack for 2½ hours.
Lynn lifted Root over the long-on boundary during one sharp blitz and his driving was smooth and effective.
The 23-year-old followed the instructions of his State coach, Stuart Law, by using the chance to make a name for himself.
"He is one for the future," Law said. "He has an opportunity this week and if he does well all he can do is put his name up in lights."