Worcestershire's victory push was held up by the Gloucestershire seventh wicket of centurions Chris Dent and Jack Taylor on the final day of the Specsavers County Championship clash at Bristol.
Gloucestershire resumed on 217-6 with Chris Dent unbeaten on 81 and Jack Taylor eight after Matt Henry's three wicket burst had raised Worcestershire's hopes yesterday evening.
By lunch the home side had moved onto 357-6 from 98 overs – a lead of 326 – with Dent on 122 and Taylor 101.
The pair safely negotiated the remaining 10 overs before the second new ball was taken at 242-6.
Dent followed up his 180 against Derbyshire last week at Bristol by reaching three figures with two boundaries in an over from Ed Barnard.
The left hander went to three figures off 225 balls with his 13th boundary. Taylor completed his half century off 69 balls with six fours.
Skipper Daryl Mitchell rotated his bowlers but they were unable to make the breakthrough on what is still a good pitch.
The 100 partnership between Dent and Taylor was raised in 26.4 overs. Moeen Ali came into the attack and conceded 21 runs in his first over of the morning.
Taylor also completed his hundred in the final over before lunch via a six off Moeen. His ton came from 95 balls with two sixes and 12 fours.