Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Check my valve spring specs for cam break in
View Single Post
  #12 (permalink)  
Old 06-20-2013, 09:39 PM
MouseFink MouseFink is online now
Registered User
Join Date: Jun 2010
Location: TX
Posts: 2,499
Wiki Edits: 0

Thanks: 28
Thanked 271 Times in 251 Posts
It is critical that you set the lifter preload and time the engine before you install the engine. You do not want to be cranking on a new engine trying to adjust the valves and timing.

I have only had one camshaft go flat and that was in 1966 and it was because I carelessly got used lifter mixed up. I have never used light valve springs to break in a camshaft but I never used a flat tappet camshaft with more than 125 lb. seat pressure and 325 lb. open pressure. I have never used any special motor oil except Valvoline 10W-30 All Season with Crane Moly paste on the cam and lifters. The engine is primed on the engine stand with a variable speed drill as the crank is slowly rotated by hand.

Make certain the engine will start instantly and you can run it up to 2500 RPM when breaking in a new flat tappet camshaft and lifters. If you try to set the timing, lifter preload or valve lash and monkey with the carburetor adjustments when you are breaking in a new camshaft, you may have the experience of watching your camshaft go flat no matter what trick oil or additives you are using. .

Last edited by MouseFink; 06-20-2013 at 09:48 PM.
Reply With Quote