| Also known as | E9989 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 36 |
| Subsystem | engine bottom |
| Listed in parts books | 1970–1971 |
CAMSHAFT EXHAUST T120 (FACTORY RACE Q CAM) .314 lift 55-34 degree
Factory race grind exhaust camshaft (Q cam, .314 lift, 55-34 degree) for the T120, cataloged as 70-9989.
The 70-9989 is an exhaust camshaft, the Q cam grind Triumph listed in the T120 factory race parts as a .314 lift, 55-34 degree profile. It's a cam-bottom-end piece that lives with the crankshaft and connecting rods in the timing chest area, controlling how far and how long the exhaust valves open on each cylinder. This is a factory race grind, more aggressive than the stock exhaust cam, meant for engines built up for performance rather than everyday road use.
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Catalog records show this part number carrying through 1970-1971 T120 listings, and it also appears under the earlier alias E9989 and supersedes the older factory number 71-0041 - so if your parts book still lists 71-0041, this is the same physical cam under the current number.
Because this is a race-spec cam and not the stock grind, valve timing and clearances change from what a stock exhaust cam calls for. If you're not already deep into building the head and valvetrain to match, talk to us before ordering so we can confirm it's the right cam for what you're doing.
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