5.9L Magnum questions

When I search "Comp 901 spring magnum" this old Moparts post is one of the results. One guy says the 901s will work, another guy chimes and in and says they won't work without machining, another guy steps in and says they will work... Yup, that's the internet alright.

I bought the Hughes springs # 1110P when I did my build (I actually bought the entire HUG 1199 kit) because I couldn't find any other brands whose marketing specifically said their springs would work on a Magnum head.

Just doing some checking right now, Hughes says their springs are 1.440" outside diameter, and as you mentioned the Comp springs spec out at 1.494" OD. So I guess you would need to grind off half of that that 0.054" difference all the way around. Doesn't sound like much, but multiply that by 16 and it doesn't sound like fun.

Maybe you could sell your 901s and get the Hughes springs? The whole kit from Hughes is $240, or you could just buy the springs for $144.