Oil cooler Inlet 0540

[714714xmas]

Looking at purchasing a oil cooler for my o540 from summit
what size Inlet i see 10 na ...12na ...and 16 na.. what size is compatible for the o540?

 

[kwanjangnihm]

Many 540's run this Hayden
Hayden Fluid Coolers 1260
Inlet Size:3/4 in. NPT
Inlet Attachment:Female threads
Outlet Size:3/4 in. NPT
Outlet Attachment:Female threads
https://www.summitracing.com/parts/hda-1260?seid=srese1&gclid=Cj0KCQjw7ZL6BRCmARIsAH6XFDJlWkQy_S7Iq-u0EZiv8oF-YT7d4WQNIysyqYRwnRXYK5zZRKP1OMcaAgPvEALw_wcB

Here is a website with AN fitting info: http://www.russellperformance.com/misc/support/

Follow John's advice :thumbleft:

-8 fittings or at least 1/2"NPT to adapt to.