Race eight in the Michelin Porsche Open Series at Oulton Park on 31 July will get the season underway once more after a six-week mid-season break. An excellent entry has been assembled for the only Open race at the Cheshire track this season.The mighty 935 of Richard Chamberlain continues to be the dominant force in the series with five wins from six starts. Only a broken driveshaft on the warming up lap at Snetterton in May prevented a clean sweep of victories in the races he has started. Now, the Cambridgeshire racer will return to one of his favourite circuits aiming to add another win.Rupert Lewin will make a welcome return to the series at Oulton in his superb 996GT2R. Sidelined from a couple of races recently after some engine dramas, Lewin will resume his bid to rival Chamberlain at Oulton.The class two entry includes four 911GT3 Cup cars as used in the Carrera Cup GB, and it is the car of Craig Rapp that is setting the pace this season. Having missed the two opening races at Croft, Craig has since been unbeaten with a run of five wins on the trot. Gerald Harrison and Henry Firman lead the chase, but a darkhorse could be former Porsche Club front-runner Rod Carman in his GT3 Cup car. Carman will bring his rarely used car out on home ground and could well be the biggest rival to Rapp.Another growing force in class two is Tony Brown in his 964RSR. Fresh from scoring a podium finish in the recent British GT race at Oulton (when racing a GT3 Cup car with old rival Colin Broster), Tony should have his new car going stronger that ever. Meanwhile, John Bussell in the Rupert Lewin entered 911 Turbo is another quick class two entry.A quartet of 944 Turbos heads the class three entry including the Track Torque Racing cars of double-winner Gordon Matthew and Clive Reay-Young. However, David Botterill could be the man to beat if he enjoys better fortune than on his last visit to Oulton. At the start of July he ended a sports/saloon race in the barriers on the pit straight in his 944 Turbo, but with the car repaired he will be a strong contender, as will Wayne Jackson (944 Turbo) and Peter Morris (968CS).Finally, the new class four for 944s is proving a great success, with close racing amongst half a dozen evenly matched cars. Alex Eacock is having a superb season and has yet to be beaten in the seven races to date. The men trying to bring a halt to the Eacock rout include Nigel Ainge and Charles Winterhalder.