Ron:
Early heads used 1/2 inch reach plugs. Later heads used 3/4
inch.
For Ron, attached is a page showing plug numbers. It's a little
messy as I had to convert the existing TIFF image to text and
didn't bother cleaning it up.
Blake
II - 22
The Capacity of the Condenser is .18 - .23 microfared.
SPARK PLUGS
Choice of the proper plush will depend on the condition of the
engine and its stage of tune. A worn engine will need a hot plug
to resist oil fouling, while a modified engine may require a
colder plug to deter pre-igndtlon. Now a plug needs a wide
Operating range to resist both these problems, and it 18 a great
credit to automotive and plug engineers that their products
perform 80 well. The following are general recommendations, for
no two engines, even when built to the same specification, will
have exactly the same pluS heat requirements. So, on Occasion,
some experimenting may be necessary.
heat range
application
head type reach smoker normal
hi-apeed
banana 1/2
B or C D or E F
or a
round 3/4
The proJected core pluSs (*) offer a very wide heat operating
range COmpared to the conventional type. It will be noticed, in
the chart below, that one manufacturers plug may not have an
exact counterpart in another brand. LSke many others, the
author was once Carried away with the romance of the imported
plug. Frequent troubles have been disallu9ionlng, and he 18 now
convinced the Yanks make the best product, with Champlon taking
his preference. KLG are also quite suitable, offering the widest
range of plugs with different heat values. KLG 'P' (or 'PS'
resistor) type waterproof covers are the best plug terminals
available.
1/2 INCH REACH I 3/4
INCH REACH
KLO Champion AC Autolite KLG
Champion AC Autollte
l
l 1-'
F20 L-14 A FE20
N-21 Ad9
4
AE82* AG82f
47FF
] 47XL
I E FE50
N-18 AG7
l
N-16Y@
46FF 46XL
AE6 C FE45P*
N-14Y* 46XLS*
46FFX*
AE52* AG52*
F50 L-10 D FE50
N-8 AG5
F55P* UL-15y* FE55P*
UN-12Y*
45FF 45XL
F65P* 45FFX* AE42* E
FE65P* 45XLS* AG42*
F70 44FF AE4 FE70
N-6 AG4
UL-12Y* 44FFXs I
N-9Yx 44XL8* AG32*
F75 L-7 F FE75
N-5 43XL AA2G2*
F80 L-5 42FF a FE80
N-4 AG2
l
N-3 42XL8*
F100 | H FE100
FE125P*
F220 ! J FE220
///
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