Model overview |
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| E: 61" cubic inches engine (e.g. EL) | ||
| F: 74" cubic inches engine (e.g. FL) | ||
| L: high compression (7 : 1) (e.g. FL) | ||
| H: Super Sport, higher compression than FL model | ||
| S: sidecar gearing (e.g. FLS) | ||
| F (not first character): footshift (e.g. FLF) | ||
| P: springer forks (e.g. EP), stamped at end of serial number | ||
| E: (third character): 61" cam & M61 carburator (e.g. FLE) | ||
| B: electric start (e.g. FLB) | ||
| E | 61" c.i., 6.5 : 1 compression | |
| EL | 61" c.i., high compression | |
| EP | 61" c.i., springer fork | |
| ES | 61" c.i., 6.5 : 1 compression, sidecar gearing | |
| ELF | 61" c.i., high compression, footshift | |
| ELP | 61" c.i., high compression, springer fork | |
| ELS | 61" c.i., high compression , sidecar gearing | |
| EPS | 61" c.i., springer fork, sidecar gearing, springer fork | |
| ELPS | 61" c.i., springer fork, sidecar gearing, springer fork | |
| F | 74" c.i., 6.6 : 1 compression | |
| FL | 74" c.i., high compression | |
| FP | 74" c.i., springer fork | |
| FS | 74" c.i., 6.6 : 1 compression, sidecar gearing | |
| FLB | 74" c.i., high compression, electric start | |
| FLE | 74" c.i., 61" cam & M61 carburator | |
| FLF | 74" c.i., high compression, footshift | |
| FLH | 74" c.i., high compression Super Sport | |
| FLP | 74" c.i., springer fork | |
| FLS | 74" c.i., sidecar gearing | |
| FLEF | 74" c.i., high compression, 61" cam & M61 carburator, footshift | |
| FLFB | 74" c.i., high compression, footshift, electric start | |
| FLHB | 74" c.i., high compression, electric start, Super Sport | |
| FLHF | 74" c.i., high compression, footshift, Super Sport | |
| FLPS | 74" c.i., high compression, springer fork, sidecar gearing | |
| FLHFB | 74" c.i., high compression, footshift, electric start, Super Sport | |
| S (sidecar gearing) and F (footshift) not shown in serial number | ||
General specifications 1948 - 1954 |
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| E & EL | F & FL | |
| Type of engine | 61 C.I. OHV Twin | 74 C.I. OHV Twin |
| Cylinder bore | 3 5/16" | 3 7/16" (87.3 mm) |
| Stroke | 3 1/2" | 3 31/32" (100.8 mm) |
| Piston displacement | 60.32 cubic inch | 73.66 cubic inch |
| Compression ratio (low compression model) |
E: 6.5 to 1 | F: 6.6 to 1 |
| Compression ratio (high compression model) |
EL: 7.0 to 1 | FL: 7.0 to 1 |
| Horsepower (N.A.C.C. rating) | 8.77 | 9.44 |
| Wheelbase | 59 1/2" | 59 1/2" |
General specifications 1955 - 1957 |
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| FL | FLH | |
| Type of engine | 74 C.I. OHV Twin |
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| Cylinder bore | 3 7/16" (87.3 mm) |
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| Stroke | 3 31/32" (100.8 mm) |
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| Piston displacement | 73.66 cubic inch (1207 cc) |
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| Compression ratio | 7.25 to 1 | 8.0 to 1 |
| Horsepower | 55.0 @ 5400 RPM | 60 .0 @ 5500 RPM |
| Torque | 62 lb-ft @ 3200 RPM | 65 lb-ft @ 3200 RPM |
| Wheelbase | 60" | 60" |
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| Sources: see also Books Bruce Palmer: How to restore your Harley-Davidson Greg Field: Original Harley-Davidson Panhead Peter Henshaw: The legend of Harley-Davidson Harley-Davidson Panhead Service Manual - 1948 - 1957 and various other sources |
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