Quote:

---

A friend is working on a 1960 413 engine and it has springs on the intake valve stems inside the ports. I've never seen anything like it. Anyone know anything about these? See the picture.

---

Did that motor come from Mexico? Probally a trick of the week some time ago or a massive screw up on somebodys part originally That or one of the local other brand shops where trying to slow that big old motor down