You get a punchout card actually. After 3 motor pulls, two transmissions on your back, several tows, a trip to Karl's, and one night of regret in belmar, you earn a cherry.
Sounds about right however for each engine pull, a free voucher for all meals is provided. You can trade in a cherry early for a link bar lifter install with the heads on as well. As a BLS rewards member, you also get free priceline negotiations for life.