[Healeys] HS-4 insulating blocks / distance pieces

Bob Haskell rchaskell at earthlink.net
Sat Jun 23 18:13:29 MDT 2018


I'd like to confirm the number of insulating blocks / distance pieces 
(AEC2126) fitted around the tri-carb heat shield, after engine 29E-928.

In the 2018 version of the Concours Guidelines, on the bottom of page 
35, it states: "Heat shields for the 29E engine; early cars have an 
inner asbestos shield attached in the same manner as the 29D. Later cars 
after 29E-H928 had an inner and outer asbestos shield requiring 
carburetor spacers. There is a thick spacer on each side of the heat 
shield: one next to the manifold and another between the heat shield and 

The service parts list (AKD1151 5th ed.) shows that the heat shield part 
number did change at engine 29E-929.  It also shows the addition of the 
distance pieces at the same point.  But the quantity is only three; not six.

If there weren't any distance pieces used on the early 29E engine, then 
I could see where a distance piece between the heat shield and the 
carburetter would be required to space the carb out the same amount as 
the outer asbestos shield.  Don't know why the distance pieces would 
also be needed between the intake manifold and the heat shield.  Unless 
there was another issue being addressed?

Have also sent an email to Roger Moment.


Bob Haskell
AHCA 3000 MkI registrar

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