The Ford Barn - View Single Post - Proper Valve springs for 296 cu.in. flathead with Howard cam M12

Flathead · 02-05-2024, 04:16 PM

I ran Isky 185 springs on a Potvin 425 eliminator. It regularly turned over 7000 rpm at the drags never a problem. I agree that those double springs aren't worth the bother.

02-05-2024, 04:16 PM	#11
Flathead Senior Member Join Date: May 2010 Location: Southern Maine Posts: 1,502	Re: Proper Valve springs for 296 cu.in. flathead with Howard cam M12 I ran Isky 185 springs on a Potvin 425 eliminator. It regularly turned over 7000 rpm at the drags never a problem. I agree that those double springs aren't worth the bother.