Iron BBC w/ aluminum head growth

[Ed Wright]

As long as we have a cold reference that we know is as close as we can run them warm, what does it really matter how many thousandths it gains warm? I know that my intakes touch warm with racing springs, when they check .033" cold with checking springs, don't touch at .036" cold with checking springs, right now they have .040" cold with checking springs, what does it really matter what it has warm with racing springs?

And yes, I do have one of those old Moroso tools for checking springs on the engine with a flex beam torque wrench. You can use a 1/2" break over to check like that. Slips off my Jessel rockers. I check everything before I set up & install my springs. Last thing I do before I bolt them on to stay.