Valve spring for cam break in
 

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?

Re: Valve spring for cam break in
 

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.

Re: Valve spring for cam break in
 

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.

Re: Valve spring for cam break in
 

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.

Re: Valve spring for cam break in
 

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

Re: Valve spring for cam break in
 

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.

Re: Valve spring for cam break in
 

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.

Re: Valve spring for cam break in
 

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

Re: Valve spring for cam break in
 

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

Re: Valve spring for cam break in
 

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