| Also known as | E3753 |
| Diagram | Fig. 5 — CYLINDER BLOCK AND HEAD, T90 · ref 8 |
| Subsystem | engine top |
| Listed in parts books | 1964–1970 |
TAPPET,TRIUMPH 500 STD
Standard-size tappet for the Triumph 350/500 unit twin, used in the cylinder block and head assembly.
70-3753 is a tappet for the Triumph 500 twin, standard size. In the catalog it shows up in the cylinder block and head listings for the 350/500 unit twins - the 3TA, 5TA, T90, T100, T100C, and T100SS - so it's part of the valve train that rides on the camshaft and transmits lift up to the pushrod. The legacy form of this part number is E3753, which is the same physical piece under the older letter-prefix system.
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A tappet like this sits down in the cylinder block, following the cam lobe and passing that motion along. It's a wear part that works against the cam surface every time the engine turns over, so condition matters more than most folks think when you're chasing valve clearance or unexplained cam wear.
This one is listed as standard size rather than an oversize or radius variant, so check what your block is currently fitted with before ordering. Our catalog record ties it to the 350/500 unit twin cylinder head and block figures across several model designations from the mid-to-late '60s into 1970 - call the shop if you want us to confirm it against your specific engine.
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