| Spitfire 4 (Mk I) changes | after commission # | |
|---|
| FC1876 | frictionless propeller shaft changed to “regular” type |
| FC2393 | a rubber seal now fitted between dust shield and caliper mounting bracket |
| FC2449 | pistons upgraded to stronger & lighter solid-skirt type |
| FC2604 | metal clips go to plastic for holding on badges |
| FC3200-FC5588 | a small batch of rear springs (made by Cocker) gave incorrect rear wheel camber |
| FC3214-FC39528 | front spring spacer (springs arrived at factory 3/8″ short and spacer was used to correct ride height) |
| FC5463 | B-post: wing ridge (vertical moved back appox. 1″ from door opening |
| FC8274 | a moulded rubber hose replaced the canvas hose between the heater water valve at the bulkhead and the cylinder block |
| FC8779 | door seal changed from double (one fabric, one rubber) to single. Seal colors changed from interior colors to black only |
| FC5964 | air box area revisions (under bonnet): speedo and tach cables’ come out of air box instead of out of trans cover, new washer bottle (Tudor) & bracket changed to single bolt strap type, drain pipe replaced with rubber flap |
| FC14196 | Rear bumper mounting: Upper mounting bracket replaced with bolt & tubular spacer. Lower mounting bracket now attaches to frame underneath not through body. |
| FC15089 | grey rubber floor mats & shift gaiter changed to black rubber |
| FC15576 | new vertical link and tie rod lever redesigned to accept the new disk brakes |
| FC16570 | long stem rear view mirror chanded to short stem, rigid version |
| FC17136 | 6.25″ coil spring clutch changed to 6.5″ |
| FC18814 | B-post cap enlarged to fill area left by shortened trim |
| FC20029 | different wiper motor and wiper blades |
| FC20061 | flywheel bolts and tab washers were replaced with self locking “place” bolts |
| FC20753 | millboard engine valances fitted |
| FC21927 | gear shift bushing (at base) changed to reduce metal to metal contact |
| FC26303 | temp sending unit changed |
| FC28017 | modified exhaust mounting |
| FC30192 | connecting rod material changed from 40 to 45 ton steel. Tab washers (beneath the big end bolts) removed and self-locking “place” bolts used. |
| FC37878 | improved front trunnion seals |
| FC39925 | header cooling tank removed due to overcooling |
| FC40531 | wire guaze air filters changed to exposed paper filters |
| Spitfire 4 (Mk I) changes | at date | |
| August 63 | differential drain plug deleted |
