With a new longtail body, the 907s reached 302 km/h (190 mph) on the straight even though they used the reliable 220 hp Porsche 910 2000cc 6-cyl rather than the more powerful 8-cyl. Also, vented brake disks were used as standard from now. The best Porsche 907 finished 5th, beaten only by Ford and Ferrari with their much bigger engines.
As the record-breaking performances of the 7.0L V8-powered Ford had triggered rumors about a future rule change, Porsche started to prepare themselves in summer of 1967. The 907 was equipped with the 270 hp 2200cc 8-cyl which was then modified for the rules of the new 3 litre prototype category that was announced in late 1967 to come in effect already in 1968. An engine with the full 3000cc would have to be developed first, though, to be introduced in the future Porsche 908.
Porsche was serious. Unlike during the rather modest earlier years, four cars were entered in the 1968 24 Hours of Daytona, supported by 20 mechanics and engineers. The pilots were fitted with cooling vests developed by NASA as the oil-cooler and the hot oil pipes caused heat in the closed cockpit.
After the #53 car of Gerhard Mitter had a big crash caused by tyre failure in the banking, his teammate Rolf Stommelen supported the #54 driven by Vic Elford/Jochen Neerpasch. When the #52 car of the longtime leaders Jo Siffert/Hans Herrmann dropped to second due to a technical problem, these two also drove on the #54 car in case theirs broke down. Due to this, five pilots won the race, and two of them scored also second. The #51 Jo Schlesser/Joe Buzzetta completed the 1-2-3 side-by-side parade finish that the Ferrari Prototypes had shown a year earlier at the banked finish line. The three Alfa Romeo T33/2 were even beaten by a Ford Mustang.
The 12 Hours of Sebring saw a 1-2 win of Porsche 907, by Jo Siffert/Hans Herrmann and Vic Elford/Jochen Neerpasch, with Gerhard Mitter/Rolf Stommelen as well as Ludovico Scarfiotti/Joe Buzzetta being victims of engines failures.
These marked the first back-to-back major outright wins for the company, and french journalist (and occasional racer) Bernard Cahier wrote "its hard to imagine that anyone could beat Porsche to the championship this year". The championships hopes in Sportscars and F1 would be significantly changed soon, though.
The next race was the BOAC 500 at Brands Hatch, on April 7 1968. That fateful day, Jim Clark was supposed to drive one of the new Ford F3L P68 prototypes with the Cosworth DFV-Engine, entered by Alan Mann Racing. Clark instead was driving a Formula 2 at Hockenheimring to show the new sponsorship logos for Team Lotus, and got killed there. Jo Siffert/Hans Herrmann were fastest in qualifying ahead of Bruce McLaren/Mike Spence in the new Ford, but none did finish. It was the updated John Wyer-entered Ford GT40 of Jacky Ickx/Brian Redman which won ahead of the remaining two Porsche 907 after being only 5th on the grid.
In races on faster tracks like the 1000km Monza, these modified old Ford GT40 entered by JWA Gulf Racing Team proved to be an unexpectedly strong force. The loophole for these 5 Liter sportscars was opened if at least 50 were built, to let the many existing Lola T70 take part, too. For 1969, the minimum number was lowered to 25, which opened opportunities unexpected by many.
At the twisty Targa Florio, the only privately entered GT40 finished last, but the Alfa Romeo T33/2 were strong. In lap 1, Vic Elford had lost 18 minutes due to a tyre failure. Supported by veteran Umberto Maglioli, he showed a fantastic race in the 907, reminding of Juan Manuel Fangio's legendary 1957 German Grand Prix, beating the old lap record by one minute and winning by 3 minutes. Hans Herrmann & Jochen Neerpasch came in 4th among four Alfas. In the Porsche advertising poster celebrating the win, only an exhausted yet smiling Elford was shown, not the cars as usual.
The 1000km Nürburgring was won with the new Porsche 908 with its 3000cc engine, but it still was unreliable. The underpowered 2200cc 907 with less than half the Ford's displacement continued as Porsche's best entry in 1000km Spa, Watkins Glen and Zeltweg, losing to the Ford GT40s.
This set up the stage for a showdown at the Sarthe, as due to political unrest in France, the 1968 24 Hours of Le Mans had been postponed from its traditional mid-June date to the end of September. Porsche could not take advantage of the additional time to improve the 908 nor read the French rule book properly. For the first time, Porsche were the fastest in qualifying and the early stages of the race, but troubles with the 908's alternator caused delays and even disqualifications as the new Porsche staff had misinterpreted the repair rules.
For the third time in a row, a V8-powered Ford won the 24h classic. A Porsche 907 Long Tail came in second in front of the sole surviving 908. In addition, Ford had taken the World Sportscar Championship, too.
At that time, Porsche had already decided to make a risky investment in order to go one step further beyond the 3 Litre 908 prototype: they committed themselves to develop a new 5 Litre sportscar and built the required number of 25 in advance.