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Oil cooler Inlet 0540


Active member
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?
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

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

Follow John's advice :thumbleft:

John Fenner said:
-8 fittings or at least 1/2"NPT to adapt to.