Quote Originally Posted by DaveS53 View Post
The fittings should have 1/4" straight pipe threads.

https://www.summitracing.com/parts/sum-220027/overview/

https://www.engineersedge.com/fluid_...eads_13376.htm
I found out you have to check before you order the fittings to replace the GM quick connect fittings. GM apparently used several different ones. Mine were 9/16-14.