What Pontiac engines were in the Mickey Thompson Challenger 1?

[LDO]

Was it a bored and/or stroked 389? 

[espo]

Bunky Knudsen at GM sent Mickey Thompson 4- 389 cu in engines for his 1960 attempt at the record. These were modified by Mickey and his mechanics to a reported 414 cu in each. After bad track conditions where high speeds even proved fatal for one driver they didn't try again until Sept. of 1960 when they went 406.6 mph on a one-way run. On the return run needed to set the official record they had mechanical problems that caused one of the engines to over rev and damaged it to the point that they couldn't back up the speed for the record. 

[Ace-Garageguy]

7 hours ago, LDO said:

Was it a bored and/or stroked 389? 

Yes, but if you're considering using the kit engines as stand-ins for other displacement first-gen Pontiac OHV V8s, have no fear.

The popular 326-389-421 engines are all outwardly visually identical, with only bolt-on parts being different appearance-wise from 1955-1981

Quoting Wikipee:    Pontiac differed from other GM Divisions and most other manufacturers in producing only a single sized V8 casting, rather than adding a larger big block to its line-up. The external dimensions of all their V8s, from 326–455 cu in (5.3–7.5 L) were the same.

EDIT: Though there some short-deck oddballs in later years, and the early engines featured "reverse cooling", the basic engines will interchange visually in 1/25 scale.

Edited May 22 by Ace-Garageguy

[LDO]

Thanks. Sometimes I just have weird questions and the answers are not readily available. 

[deuces wild]

I like the Super Duty 421s from the '62 amt Catalina kit....😎👍