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From the Motor Sport Archive
After an interval of four weeks, the Can-Am circus returned to the United States for the fifth round of the series at the Mid-Ohio Sports Car Course. All the usual entrants were in attendance, though with a number of significant changes to their cars. Both works McLarens were using their larger 7.6-litre Chevrolet engines, the overheating that has plagued these units in previous races having been cured by the modified radiator outlet tried for the first time in the previous race at Edmonton. The rear suspension of George Eaton's BRM had been redesigned to eliminate the rear-wheel steer that produced such diabolical handling characteristics. This was accomplished by eliminating the lower radius arms and replacing them with shorter arms running back diagonally from the base of the uprights to a plate attached to the rear of the transmission. The radical AVS Shadow, which had not run since the second round at St. Jovite, reappeared with Vic Elford at the wheel but Elford soon found that there were far more drawbacks to the ultra-low design than there were advantages. The severe overheating which afflicted the car in the first two races had been overcome by moving the twin radiators from their position inside the wing to exposed locations on top of the rear fenders. Unfortunately, this exposed position, combined with the extreme angle of a new wing (which made it more of a spoiler than a wing) almost doubled the frontal area of the car and completely negated the original concept of a car with such low frontal area that its high speed down the straights would more than offset any cornering disadvantages imposed by the miniaturised suspension.