Yep, and to the tune of and around 700 horsepower. The engine set up on the right was called the "turkey baster"
I know a chap that was running a Lola chassis back when these were being tested. He remembered that they were having issues keeping the engines running right, but when they did....no one could keep up with them. The power and acceleration was "unbelievable".
700-800 HP out of 3 litres (181 CI.)
I think a Buick still holds the Indy lap record (in testing and qualifying.) 224 mph?