Valve spring for cam break in

[Mike Graham]

Looking for input on breaking in a stocker cam.
240@.050 .380 lift. Can I get bye with valve springs with about 70 or 80lbs in the seat for break in?

[randy wilson]

Yes, use a break in oil, or a high zinc content petroleum oil. 1.3 rockers are the best to use, but you should be fine. I always run 2 extra quarts in the pan for break in for the splash effect. But, that's just me.

[carl hinkson]

Short rockers are an option but will not work if the push rod holes have not been clearance.

What are your seat and over the nose pressures?/

I build a lot of circle track engines with 135 at the seat and 320 over the nose HYD cam and with 1.5 rockers never had an issue so far.

I do use a P-55 cam core and GM lifters with the steel bottoms.

[Mike Graham]

My main concern if if this pressure it too low for controlling the valvetrain during breakin.
This cam is very aggressive looking. Fast opening rate,almost flat at full lift.
I am changing to a different spring after breakin.

[Glenn Briglio]

Originally Posted by randy wilson

Yes, use a break in oil, or a high zinc content petroleum oil. 1.3 rockers are the best to use, but you should be fine. I always run 2 extra quarts in the pan for break in for the splash effect. But, that's just me.

Two extra quarts? Are you aerating the oil doing this?

[carl hinkson]

Originally Posted by randy wilson

Yes, use a break in oil, or a high zinc content petroleum oil. 1.3 rockers are the best to use, but you should be fine. I always run 2 extra quarts in the pan for break in for the splash effect. But, that's just me.

I don't think I would ever do this a lot of years building engines and never heard of this, There should be plenty of splash with out over filling an engine with oil.

[randy wilson]

I've done it, but never rev the motor past 3,000 rpm. No one recommended it to me, I've just used it, and had no ill effects in maybe 5 engines. After 20 min. I drain it all out, and install the correct amount. No one has to do it, it's just what I prefer to do.

[Mike Graham]

The question is more about if the valve spring pressure is high enough for a stock eliminator cam.

[Jim Hanig]

What type engine cleveland windsor, cleveland 90 to 110 seat 275 open 115 /275

[Bill Diehl]

Originally Posted by Mike Graham

The question is more about if the valve spring pressure is high enough for a stock eliminator cam.

It does not take much pressure to control the valvetrain at 3000rpm or so, but .........I am all ears, I would like to see what others are doing also