Ported vs manifold vacuum for dissy
I have modified the vacuum feed to my dissy from the ported vacuum port on the carb to direct manifold vacuum.
This I did to derive the benefits of full vacuum advance at idle - like I have done on all my cars over which I have this kind of control.
Main benefits:
1) more efficient idle, hence;
2) lower idle fuel consumption (academic I know);
3) less heat being generated for cooling system to get rid of (not an issue on the 235, but a very substantial issue on my V12 Jag, and the 440s in my Jensens .)
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Best regards, Philip
Chev: '70 C10 (350 V8 / 700R4 ) & '59 Apache ( 235, 3-sp )
Jensen Interceptor '74: Mopar 440(EFI'ed) / 4L60e
Jaguar: '72 E-type Coupe V12 & '74 E-type V12 Convertible & '80 XJS V12
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