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Universal Engine Identification
The model identification plate for your Universal engine will typically be located on the exhaust manifold.

Actual identification from the engine is your most reliable method.
Model Horsepower Years Produced
M-12 10 1983-88
M2-12 11 1987-Current
5411 11 1977-1982
M-15 11 1982-1983
M-18 14 1983-88
5416 16 1976-1982
M-20 16 1982-83
M3-20 18 1988-Current
5421 21 1978-1981
M-25 21 1981-1986
M-25XP 23 1986-Current
5424 24 1977-1983
M-30 24 1983-1987
M4-30 25 1988-Current
M-35 30 1987-Current
5432 32 1977-1982
M-40 32 1982-Current
5444 44 1980-1982
M-50 44 1982-Current