Matt Round-Garrido won the first heat of the 2017 Walter Hayes Trophy after regaining his lead on the last lap from James Raven.
Round-Garrido, who started in third, led for much of the race, but was caught by Raven around half-distance.
Raven had charged up from fourth and been the quickest man on track in the first half of the race held on a drying track in brightening weather.
But Round-Garrido played a long game and reeled him back in, taking advantage of a final lap slip-up from Raven to get back through.
Both Round-Garrido and Raven took advantage of a messy first lap by front row pair Jake Byrne and James Roe Jr.
Roe initially passed Byrne, who then slid off at Brooklands and rejoined in fourth place.
James Scott-Murphy was initially a contender, having run as high as third, but he fell back to eighth.
Byrne kept out of trouble for the rest of the eight laps and finished third ahead of Roe and Swift Cooper’s Thomas Capezzone. US F1600 champion and Festival star Matt Cowley was only seventh behind Rob Hall after an early visit to the Luffield gravel in an incident with Roe.
Best of the Historic competitors was Ed Thurston in ninth in a Jamun M89.