GR-1 stood for General Research Mk1 and was the experimental replacement to the ESV series. The GR-1 is based on the Bluebird 610 and utilizes an L14 powerplant. Instead of padded bumpers, the GR-1 utilized a "soft" nose cone.
Source: www.conceptnissan.com
Images: Nissan
![](https://static.wixstatic.com/media/ab08cf_2cf919e16e814403aee2f47d6ac9a140~mv2.jpg/v1/fill/w_980,h_735,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/ab08cf_2cf919e16e814403aee2f47d6ac9a140~mv2.jpg)