| Also known as | E6439 |
| Diagram | Fig. 4 — CYLINDER BLOCK AND HEAD, TR6 · ref 15 |
| Subsystem | engine top |
| Listed in parts books | 1967–1968, 1970–1971 |
SPRING CUP,66-72 (THICK)
Thick-style bottom spring cup for the valve spring in TR6/T120-family cylinder heads, 1967-1971 catalog listings.
This is the thick-style spring cup used at the bottom of the valve spring in the cylinder head, part number 70-6439, also known by its earlier E6439 designation. It shows up in the cylinder block and head sections for the TR6, TR6R, TR6C, T120 and T120R across catalog listings running 1967 through 1971.
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A spring cup like this sits under the valve spring and gives it a proper seat against the head, keeping the spring aligned as it compresses and extends with each valve opening and closing. The catalog specifically calls this one out as the thick version, which tells you there's a thin counterpart out there for the same location -- so when you're ordering, make sure you're matching the thickness called for in your head assembly rather than just grabbing whichever cup is in stock.
Given the figure titles, this is a bottom-of-spring component in the top end, not a top collar or retainer. If you're rebuilding a head from this era, it's worth checking the parts book diagram for your specific model to confirm you're pulling the right thickness variant before you order.
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