Setting up heads to break in cam suggestions please?

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Setting up heads to break in cam suggestions please?

Post  75truck on August 29th 2017, 11:30 pm

I am about to install heads on a 429.

Springs are single with a dampner.

Below the spring is a spring cup to locate the bottom of the spring.   I plan to remove the cup to lighten the spring pressure
for break in.  When I remove it the spring it will sit directly on the head.

For break in of my solid lifter cam and only running it around 2500 rpm would this work ok even though I do not have a bottom spring locator.

Or will the spring move around too much at the bottom?

Other suggestions?

Thanks to all.

Bob
Tucson



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Re: Setting up heads to break in cam suggestions please?

Post  BBFTorino on August 30th 2017, 12:35 am

I would keep the spring cup in place so the spring does not wobble around....when it does that it helps to wear out the valve guides sooner.
The cup is probably not thick enough to add significant spring pressure to the springs.
How wild is the cam, what is the recommended and the true spring pressures currently??
You can remove the inner damper spring to help lighten up the pressures, or get a set of weaker springs for break in purposes.

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Re: Setting up heads to break in cam suggestions please?

Post  rmcomprandy on August 30th 2017, 10:52 am

75truck wrote:I am about to install heads on a 429.

Springs are single with a dampner.

Below the spring is a spring cup to locate the bottom of the spring.   I plan to remove the cup to lighten the spring pressure
for break in.  When I remove it the spring it will sit directly on the head.

For break in of my solid lifter cam and only running it around 2500 rpm would this work ok even though I do not have a bottom spring locator.

Or will the spring move around too much at the bottom?  

Other suggestions?

Thanks to all.

Bob
Tucson

Well, every little bit could help but, removing that cup will simply lighten the open spring force by about 20 pounds and you'll probably have to mess with the seals.
Using a completely different set of lighter rate springs would be a lot better.

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