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FWIW even with new motors with full hydraulic cam/lifters...I always use break in oil like VR1 or Joe Gibbs. Even on my new BPE crate motor that had already been dynoed by them. As I was ordering the motor I said include your break in oil so we won't have any discussion on "what oil did you use" should there have been any "issues

I also agree with Bill on his notes on spring pressure and dual springs relative to engine break in with flat tappet cams and I will add valve lash is very critical (read too much and you will flatten lobes and lifters quick)...especially with "short travel" aka "racing" lifters
 
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