<prompt> Pedzisa mutsara unotevera: Sachs nomutyairi wemotokari dzemitambo Dave MacDonald, mutsva mu500, vakaurawa mutsaona yomoto yaibatanidza motokari nomwe parwendo rwechipiri rwe500  <response>: 1964 Indianapolis 500. MacDonald akanga achityaira motokari yaiva yomuridzi uye yakagadzirwa naMickey Thompson, 83 Sears-Allstate Special. Thompson akanga akumbira vakuru vakuru veUSAC kuti vashanyire shopu yake muCalifornia kuti vaongorore motokari yacho ichiri kuvakwa kuitira kuti arege kuisa mari mumotokari yacho kana paiva nemukana wekuti icharambidzwa paSpeedway. USAC yakabvuma chikumbiro chacho ndokubvumira motokari yacho nepakiti yayo yemigumisiro yepasi. Panguva iyo motokari yacho yakasvika muSpeedway muna May, USAC yakanga yachinja pfungwa dzayo ndokuikundikana. Vachishanda munzvimbo dzakatetepa dzomugaraji, Thompson nevashandi vake vakavakazve motokari yacho kuti ienderane nemitemo mitsva yeUSAC. Kuchinja uku, kubviswa kwemapenduru, kuchinjaniswa nematai akakura uye kuwedzera kukwirira kubva pamasendimita maviri kusvika kumasendimita mana, kwakaita kuti motokari idzi dzisave dzakatsiga zvikuru. Graham Hill akaedza motokari yacho pamberi peIndy asi akaramba kuidhiraivha muna 1963. Masten Gregory akadonha pakuvamba mumwedzi uno nemhaka yokusimudza mhepo. Pashure pokunge MacDonald apinda mumakwikwi uye nhangemutange isati yatanga, World Grand Prix Formula One Champion Jim Clark, uyo aiziva MacDonald uye airemekedza mano ake, akatevera muCalifornian kwemavhiri anoverengeka. Pashure pokunge vasvika, Clark akakurudzira MacDonald zvakasimba kuti abude mumotokari. Budai, akadaro Clark. Ingobuda mumotokari ufambe. Asi MacDonald akanzwa achisungirwa kukudza chibvumirano chake naThompson. Vamwe vatyairi vakateerera zano raGregory ndokuramba vari kure nemotokari dzaThompson. Pamberi pemakwikwi, Gregory akasvika kumutyairi weFormula One Jack Brabham, uyo aive padivi paMacDonald pagiredhi, uye akakurudzira Brabham kuti abvumire rookie nzvimbo yakawanda. Brabham akati zano raGregory ndiro rakaponesa upenyu hwake. 