NASCAR Whelen All-American Series officials have reportedly completed testing of the Upgraded GM engine (better known as the “Spec” engine), the Ford 347SR Spec engine and the Harrington Enforcer engine as they prepare to put the 2018 rulebook in place.
NASCAR officials worked diligently to get each engine as close as possible. It was an improbable task but reportedly they were able to get all three engines within 1% of one another on two different dynos. They were within 1% of horsepower and 1% of torque and less than 1% of acceleration.
In order to get the engines so close in all categories some hard part changes had to be made. The Upgraded GM/Spec Engine will lose the super sucker spacer plate which will be replaced with a 1″ 2 hole spacer with a 500 carb. Additionally the biggest change will come to the engines intake which will be replaced by the 2701 intake.
The Harrington Enforcer engine will also change to the 2701 intake. Racers can replace the intake for less than $150. The Enforcer will retain an open spacer plate with a 650 carb while the Ford 347SR will not get a spacer plate with a 650 carb as well.
Southern National Motorsports Park is expected to release the rules for this years Thanksgiving Classic and will likely correspond to the rules that NASCAR is expected to implement. The race is anticipated to be a “test” of sorts beyond the dyno testing to make sure that they’ve got it right before the 2018 season begins.
