Rick, there are two different distributors shaft lengths used.
The shaft length is the difference.
Early dist. 40048 and 40162 are to be used in banana hole blocks, with a center
bolt holding the distributor in place.
These distributors have a longer shaft length, as a micrometer adjuster, or a
clamp and a spacing washer, were to be used
with the distributor installation in the car.
If you use these in a later style engine, the gear will sit below the gear on
the cam, the cam gear will carve a section out of
the distributor shaft, and your timing will jump around a little.
The round hole blocks have a shaft with a half moon holding the dist. in place.
They eliminated the clamp, and decreased the dist. shaft length by 3/8 inch.
Distributor numbers 40367 and 40368 fall into this category.
If you use them in an early engine, with a clamp, the gear will barely engage
the cam gear, and your timing will jump
all over the place.
John Seim
On Apr 20, 2015, at 5:45 PM, Rick Lindsay wrote:
> Hi Friends,
>
> Update: With timing set to TDC (static) the car starts okay. On the timing
> light, actual timing jumps around quite a bit. Inside the distributor, the
> springs on the centripetal advance don't look right. They don't look like any
> advance springs I have ever seen. Small gauge wire and new-looking. Fitment
> is poor too.
>
> I have a set of springs from an E-Type. I'll put them in as a test, just a
> test. If the idle timing is stable, I'll order a correct set for proper
> advance.
>
> Lots of backfiring AND carb spitting when opening the throttle, if the timing
> is tweaked...even a little.
>
> Any way the cam timing could have jumped?
>
> Thanks for your ongoing support.
>
> -rick
>
>
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