[AngliaBob]

I'm getting ready to fire up my newly rebuilt SBC 357(?)
(350 .040 over). It has Speed Pro file-to-fit rings(R-9342). What grade non-synthetic oil should I use for the initial break-in?
0w-30 or 10w-30

 

[ddwills]

I would think 10w 30 would be fine.i used it in mine.

 

[Ghetto Jet]

I would use strait 30 weight.

 

[camaroman7d]

I use straight 30wt and I would suggest a can of GM EOS (engine oil suppliment). I am assuming this is a flat tappet cam? If so you might want to find some Valvoline Racing oil (has more zink) to help prevent a cam failure.

After initial break in change the oil and filter and run whichever oil you prefer.

Royce

 

[Restore60s]

Break in

Straight 30w will be sufficent and do like camaroman said and run engine oil supplement (GM EOS) also. RPM speeds above 2,300 on break in take the load off the cam during break-in. The cam you put in it should have a recommended break in RPM. Goodluck!:thumbup:

 

[TurboS10]

Straight 30 with EOS should get you going. Make sure to keep RPM above 2000 for around 20 minutes and vary the RPM some to make sure the lifter rotation is maintained.

Chris