Cam-lifter break in methods....open valve spring pressure

Rusty Davenport · 02-20-2014, 05:28 PM

OK.......we have done all the necessary pains to not wipe the cam out at break in time....the cam is coated and polished, the tool steel lifters are coated, the open spring pressure is 400 lbs.......is there a minimum spring pressure that requires a light spring break in and then the heavier spring or is changing springs required on any open spring pressure regardless of how low the spring pressure ???

Myron Piatek · 02-20-2014, 09:14 PM

My take on it is that running low/OEM type pressures is extra insurance for break in. The tool steel lifters themselves help as well. But personally I have always swapped springs with anything over 300lbs open when I ran conventional lifters. I've been running the Schubeck/Smith lifters for many years now without issues. (Knock on wood!

).

With all the variables, it's difficult to but a "safe" minimum/maximum number on the pressures for break in. Opinions may vary too. Play it safe.

02-20-2014, 05:28 PM	#1
Rusty Davenport Senior Member Join Date: Jun 2005 Location: Nashville N.C. Posts: 506 Likes: 4 Liked 101 Times in 27 Posts	Cam-lifter break in methods....open valve spring pressure OK.......we have done all the necessary pains to not wipe the cam out at break in time....the cam is coated and polished, the tool steel lifters are coated, the open spring pressure is 400 lbs.......is there a minimum spring pressure that requires a light spring break in and then the heavier spring or is changing springs required on any open spring pressure regardless of how low the spring pressure ??? __________________ NHRA AND IHRA STOCK ELIMINATOR 2772

02-20-2014, 09:14 PM	#2
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,542 Likes: 34 Liked 138 Times in 51 Posts	Re: Cam-lifter break in methods....open valve spring pressur My take on it is that running low/OEM type pressures is extra insurance for break in. The tool steel lifters themselves help as well. But personally I have always swapped springs with anything over 300lbs open when I ran conventional lifters. I've been running the Schubeck/Smith lifters for many years now without issues. (Knock on wood! ). With all the variables, it's difficult to but a "safe" minimum/maximum number on the pressures for break in. Opinions may vary too. Play it safe. __________________ LOCOMOTION Racing