| Also known as | E2968 |
| Diagram | Fig. 4 — INLET MANIFOLD · ref 5 |
| Subsystem | engine top |
| Listed in parts books | 1960–1962, 1964–1970, 1974 |
Insulating block
Insulating block fitted between carburetor and inlet manifold on Triumph unit twins, PN 70-2968.
This is the insulating block that sits between the carburetor and the inlet manifold on Triumph unit-construction twins, listed in the parts books under 70-2968 (also seen as 70-2968/30R or E2968). It appears across a long run of figures covering both single-carb and twin-carb inlet setups, the oil pump and release valve area, and the Amal carburetor listings for TR6 and T120 machines, so it's a part that shows up on a wide range of engine configurations depending on which manifold arrangement your bike has.
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The job of an insulating block like this is to put a heat-resistant barrier between the hot cylinder head/manifold and the carburetor body, keeping heat soak from affecting the mixture and helping the slide move freely instead of sticking from a warped or softened spacer. Older paper or cardboard-type spacers tend to compress or bow over time; this is the more rigid block-style piece the factory speced for that same location.
This number supersedes the earlier 70-4918, so if your parts book or an old parts bag shows that number, it's the same physical piece under this listing. Given how many figure variations this part touches - single carb, twin carb, TR6, T120, T120R - it's worth checking your bike's actual carb setup against the parts book before ordering to make sure you get the correct block for your manifold arrangement.
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