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J Slane · 02-01-2016, 01:14 AM

I have pac Springs on my O 41 heads, spring pressures run between 270 and 310. I have lots of room, no shim under the springs. When they were new, spring pressure 350lbs. I have enough room to run a 60 shim and will not coil bind. Would a 60 make much of a difference in pressure. Any suggestions Thanks Jay. GT\DA

02-01-2016, 01:14 AM	#1
J Slane Junior Member Join Date: Jun 2007 Posts: 67 Likes: 224 Liked 0 Times in 0 Posts	Valve springs I have pac Springs on my O 41 heads, spring pressures run between 270 and 310. I have lots of room, no shim under the springs. When they were new, spring pressure 350lbs. I have enough room to run a 60 shim and will not coil bind. Would a 60 make much of a difference in pressure. Any suggestions Thanks Jay. GT\DA