| Diagram | Fig. 5 — CYLINDER BLOCK AND HEAD TR7RV · ref 57 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1974, 1976–1978 |
SCREW 1/4UNCX3/4 PHILIPS
A 1/4-inch UNC by 3/4-inch Phillips-head screw used in the cylinder block and head assembly.
14-6606 is a 1/4-inch UNC by 3/4-inch Phillips-head screw used on the cylinder block and head assembly. The catalog places it in the CYL and CYLINDER BLOCK AND HEAD figures, including the TR7RV and T140 listings, so it's one of the fasteners holding parts of the top end together on those unit twins.
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It's a plain fastener, not a specialty part, but on an engine that gets opened up now and then for valve or rocker box work, having a few of these on hand saves a trip back to the shop mid-job. The Phillips head is factory-original spec here — some owners swap to Allen-head hardware for easier access with a socket, but that's an upgrade, not what this part number is.
If your parts book lists this under a rocker box screw kit or similar, it may be paired with other fasteners in that area, but 14-6606 on its own is just the 1/4 UNC x 3/4 Phillips screw itself.
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