This may set a new level for redneck valve spring testing at installed height, but it works well enough for my use:





These heads saw some heat when the last engine spun the bearings and seized, so I thought it wise to check the valve springs for damage. I only had to check the springs on one head to see that all of them need to be replaced. They're all shorter than the free length spec limit and at installed height show from 60-70 lbs. The spec load is 74 and 5 out of 6 on one head were more than 10% low.

I've never been a believer that there was much to gain by replacing valve springs on a N/A engine that doesn't turn high rpms, but on a forced induction engine, boosted intake pressure will further reduce valve seat pressure, so these should be replaced.

I can't find any higher rate replacement springs to fit, so I'll have to use a stock replacement. There may be a little headroom to shim for more pressure, but I probably won't do it.

Frank