I am thinking I have too stiff a spring in the P90A head. (bleeding down) I am looking for the specs on a stock spring:

Spring height installed

0D of the spring

I am looking to order a set of 90-100 open and 230-240 closed springs. Can someone give me the info or give me a link?

Contact phred He builds Z engines for raceing applications , and I think he specializes is head work . He is local , Gresham Or .

I got the specs. The valve springs were 280-300# open.

If you lifters are bleeding down then it is probably a problem inside the lifters. They can be taken apart and cleaned, this sometimes help, but if they are worn, then there is no replacement available.

This head was cleaned and prepped by Raver Motorsports.

As that may be Im sure that they didnt take the lifters out and take them apart. They wouldnt not have any viable replacements for them either as they do not exist.

So you still have your orignal lifters in there.

No amout of cleaning will clean out the lifters unless you take the physically apart.

If you read the post, ALL of the lifters "pump up". I do not feel it is because of foreign material in the lifters. I have NO compression on ANY cylinder. (After a couple of hours they bleed down and I have compression and the engine fires right up. It them pumps up and I lose all of my compression as the lifters hold the valves open when they should be closed) I am changing the camshaft, lash pads and rocker arms even as we speak. I will have it completed tomorrow and I will see how it runs with a stock hydraulic cam in place. I will let you all know! :knockedou