Yeah, the GM corporate blue looked very close to me as well. I think either of the following rattle-can colors would work pretty well:
1) Old Ford Blue (Which was used on 65-older Ford V8's - not to be confused with generic Ford Blue, or new Ford blue, which are both too dark and too purple) - Old Ford Blue is just a shade lighter than the example of the Nissan blue I found on my 66's transfer case when I stripped off the light blue
2) GM Corporate Blue (used on engines in most 77-82 GM cars and trucks) LIke Faux40 says above-- this one is probably the closest "off the shelf" option to the Nissan blue
This one is also close, but not exact:
Chevrolet Blue (used on some chevrolet truck engines 55-61) LIke I stated above, it has a bit more gray to it, but the shade of blue is almost a dead ringer for the Nissan color
And these are not close at all:
Chryler Blue (It's too turquoise)
Chrysler light blue (too light)
Dark Ford Blue (too purple)
But I'll tell ya- matching the blue on the later Patrol engines is a breeze compared to that greyish green color they used on the early Patrols. Collecting tons of pictures (thanks Audrey and Leslie), as well as RMPO's 64 restoration project on ExpeditionPortal, I found that there is a range of variability in that green color from a very light yellowish grey-green, to a more medium, olive toned green
There is not an off the shelf engine paint option for anything close to that color anywhere that I found- and the local paint store that I have worked with forever wanted 85 bucks a quart for a custom ceramic engine color blend, so I said "no thanks" to that.
I ended up using Rustoleum Sage on my 66's engine, which is only temperature rated up to 300 degrees F, but I think it should hold up ok (Like a total dork, I test-sprayed some on the outside of my barbeque before cooking up some burgers to see how it would fare against the heat
)
The Sage is more more green than some of the yellowish samples I've seen of the Nissan color, but it matched other samples (especially the original color air box from Urban60's totalled camo 64) very closely.
L-R:
White 65 Hardtop L60-3-00617 (undergoing restoration)
Red 65 hardtop 4L60-002565 (scrapped for parts)
66 Hardtop "El-Bondo Patrol", L60-00511 (Restored, then sold June2020)
Blue 67 Hardtop (sold March1997)
Green 62 Softtop L60-2-00504 (undergoing restoration)