Shovelheads

FL - 74" 7.5:1 Compression Ration

FLH - 74" 8.0:1 Compression Ratio

FLP - 74" Standard Police Model

FLHP - 74" High Compression Police Model

1A - FL, FLP, FLPF (74" - 1970 to 1980)

2A - FLH, FLHP, FLPF (74" - 1970 to 1980)

3G - 1979 Classic and 1980 FLH

3H - 1980 Classic

5H - FLHS 80

2C - FX Kick Start Superglide

2H - CLE Sidecar Model

9D - FXE Electric Start Superglide

6H - FL 80

7H - FLH 74" Police

8H - FLH 74" Shrine

9H - FLH 80

1K - FLH 80" Shrine

Shovelhead

Shovelheads (1966 to 1969)

1 - These Shovelheads were basically built on the 1965 Panhead lower end.

2 - The cylinders are interchangeable with all later 74" engines up to early 1978. The heads are interchangeable up to 1980.

3 - The engines have the same bore and stroke as all the 74" engines from 1941 to 1973.

4 - Shovelhead and Panhead exhaust valves are the same size, but Shovelhead intakes are larger.

5 - Cams will interchange from 1948 to 1969.

6 - The timing covers from 1965 to 1969 interchange.

7 - The complete primary drive and covers interchange from 1965 to 1969.

Shovelheads (1970 to 1984)

1 - These Shovelheads were changed from a generator to an alternator model.

2 - The pinion shaft is the same as previous years, up to 1972. A new one is used from 1973 through early 1982. One last change was made for 1982 through 1984.

3 - The 1970 and later pinion gear is missing a timing mark from previous years.

4 - The pinion gears are the same for 1970 to early 1977, as well as the cam and breather. Late 1977 to 1980 74" timing gear, cam, and breather is the same. Don't mix early and late components.

5 - The 74" engine was made through 1980. However, in 1978, the cylinders were changed, so that the 74" and 80" could us the same cylinder. The 80" was just bored out to it's appropriate size.

6 - The 80" was the only available Shovelhead, from 1980 to 1984, with the new Evo 80" engine beginning in 1984, also.

7 - The 1970 to 1972 timing covers will not interchange with the 1973 and later covers, as these earlier covers have no passage to feed oil to the rods.

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