Break in oil for new 440

[Ben Treinen]

Hello everyone, I recently bought a new (to me) 440 built by someone in the area. I went and heard it run on the stand for about 10 min and was told it had been broken in for 2 15min sessions using shell Rotella with zinc additive. Initial inspection of the motor looks good, oil is clean, the cam lobesI can see looks like they have begun to wear in normally. I am now in the process of putting the motor in my car and am wondering what oil i should run for the next few thousand miles to continue breaking it in. The motor is a .030 over 440 with ported rebuilt factory heads, an old stock .590 purple shaft cam, forged crank, stock rods, TRW pistons with Chrome moly rings, solid flat tappet setup with Crane ductile 1.5s and so on... I have heard good things about the Driven GP-1 break in oils (20w50 Driven Racing Oil GP-1 High Performance Break-In Motor Oil 19556) is what I'm considering but I'm out of my element when it comes to break in oil. Any guidance would be appreciated, thanks you all!

-Ben T.

 

[dadsbee]

 

[ruffcut]

I will second PENN GRADE! I've had nothing but excellent results in both the full on race motor and the stroker in my Roadrunner street driven car.

 

[RR Fan Dan]

3rd on Penn Grade

 

[Don Frelier]

Back to your original question.
I don't think you need break in oil at this point.
A good high zinc oil should be fine at this point.

 

[1967coronet]

Sounds like a nice engine.

 

[Geoff 2]

You will get LOTS of answers. ALL different. I run break in oil for 2000 miles; it is not just the cam that has to break in. After break in, pick your favourite oil that is designed for FT cams.