| Diagram | CYLINDER BLOCK AND HEAD, TR7RV |
| Subsystem | engine top |
| Listed in parts books | Not catalogued by year yet |
Cylinder block
Triumph cylinder block, catalog number 71-3679, from the TR7RV/T140V cylinder block and head figures, later superseded by 71-4005.
This is the cylinder block, catalog number 71-3679, for the engine top end. Our records show it appearing in the CYLINDER BLOCK AND HEAD figures for the TR7RV and T140V, with catalog appearances tied to 1973.
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The cylinder block is the core engine casting that houses the bores the pistons run in, and it's the structural piece that the head bolts down onto and the crankcase bolts up to. It's not a part most people swap casually, so if you're sourcing one, be sure it matches what's currently in your motor before you commit.
This number was later superseded by 71-4005, so if your parts book or an old invoice shows that later number, know that it's the same physical part under Triumph's updated numbering. Worth checking your own casting or documentation against both numbers before ordering.
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