Hi Gergo
Just looking at a combination of Clausager's book and the 100-Six Parts List:
The late 100-Six engine with the six-port manifold and HD-6 carbs was fitted
to ALL cars from Chassis/ Engine No. 52602 on, in November 1957. The
switchover from the old-type gallery head motor was fuzzy, the new motor
having begun being fitted at 48863 on, but 312 old- type motors, individually
listed in the Parts List, continued to be fitted intermittently into the next
3,740 cars until 52601.
Your C/E number , 052381, is NOT in this list of intermittently-fitted
old-type motors. The last few integral gallery-head motors in the list are:
51742, 51743, 51744, 51755, 51746, 52550 and 52601. So you should have the
new six-port head motor.
Some other cue points for roughly dating your car (52381) can be:
Sept. 1957 (47703)- sidescreens changed from front-opening (plexi angles
forward), to rear-opening type (plexi angles backwards like most)
(48387) -locking door handle dropped for late non-locking
type
Oct. 1957 (48863) -begin motor change-over to new type
(48863) - brake master/ clutch cyls. now have a single remote
reservoir, not separate integral type
(50759) - accelerator controls now snap-lock type, not
spring-loaded barrel type as on 100's
-----------
Nov.1957 (52602) - new six-port motor and remote reservoir now in all cars
Dec. 1957- (52704) -strengthening hoop introduced in bulkhead
Best regards
Peter
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