| Also known as | E3614 |
| Diagram | Fig. 4 — CYLINDER BLOCK AND HEAD, 6T · ref 20 |
| Subsystem | engine top |
| Listed in parts books | 1960–1962 |
HEAD GASKET 8 BOLT 650/500 Pre-Unit - .048 thick no oil drain holes (External Drains)
Copper head gasket for 8-bolt pre-unit Triumph 650/500 twins, .048 thick, no oil drain holes for external-drain engines.
This is the head gasket for pre-unit Triumph 650 and 500 twins with the 8-bolt barrel pattern. It's the .048 thick style without oil drain holes, meaning these engines route their oil drains externally rather than through the gasket itself. If your barrel and head use the 8-stud pattern and you're set up for external oil drains, this is the gasket that goes between them.
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A head gasket like this one seals the joint between cylinder head and barrel, keeping combustion pressure where it belongs and preventing oil and compression leaks along the mating surfaces. On the 8-bolt pre-unit engines, getting the right gasket for your drain configuration matters, since the drain-hole and no-drain-hole versions are not interchangeable in function even if they look similar at a glance.
This one also shows up under the alternate number E3614 in some records, same physical part. If you're not sure whether your engine has external or internal oil drains, give us a call before ordering so we get you the right one.
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