Mezue ahịrịokwu na-esonụ: Allison buru ụzọ gbaa ọsọ na USAC Championship Car Series na 1970. Na-anya ụgbọala nke 83 Greer Eagle 67-Offenhauser maka Ansted-Thompson Racing na
Na 1970 Indianapolis 500, ọ gbara nke anọ ma merie 1970 Indianapolis 500 Rookie nke Afọ. Ọ gaara agwụcha na 20th na isi ihe, mana n'ihi na ọ na-eji akwụkwọ ikike NASCAR, ọ gaghị eru eru maka isi ihe. Maka 1971 Allison gbara ụgbọ ala 84 Purolator Filters Coyote-Ford V8, na-emecha nke isii na Indianapolis 500. Ọ na-asọ mpi na Rex Mays 150 na Milwaukee State Fairgrounds Speedway, na Schaefer 500 na Pocono International Raceway, na California 500 na Ontario Motor Speedway, na-ala ezumike nká na ha abụọ. Allison enwetaghịkwa akara ọzọ.