Gary Bettenhausen drove a Dirt Champ car/Silver Crown car with Moser heads on a Chevy engine (I believe it ran with sponsorship from Obberdorfer Foundries) in the mid/latter 70’s. There was a car that made a couple of appearances at USAC Sprint car races in the early/mid70’s with Moser heads on a Chevy block (maybe #27) that had several different drivers including Jackie Howerton but it was never much of a factor. The Moser heads seemed to improve the performance of the Chevy, but negatively impacted the longevity.

Unfortunately, the Moser conversion never gained much traction and was hampered by a lack of funding and a lack of development.