Owner manual

14
Tuning the Vacuum Pod
Tuning the vacuum pod mainly involves spring changes to vary the opening rpm and rate. This is
achieved by using a tuning kit such as Demon Carburetion™ part number 120083, which includes
springs that vary in the amount of pre-load and spring rate in order to fine-tune the carburetor for
every application.
The Quick-Change Pod allows for tuning with different springs without the need to remove the pod
body from the carburetor main body.
1. Using a wide bladed screwdriver or a coin (Fig. 20), remove the billet disk (color may vary from
picture) from the center of the pod lid. Once the disk is loose, lift the disk from the pod lid and
remove the spring.
2. Please note the O-ring that seals the disk to the pod top (Fig. 21).
3. Replace with a spring selected from the chart below and reinstall the disk (Fig. 22).
Figure 20 Figure 21 Figure 22
350 CID Engine
402 CID Engine
Spring Color
RPM to Open
RPM at Full Open
RPM to Open
RPM at Full Open
White
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Yellow (short spring)
1620
5680
1410
4960
Yellow
1635
5750
1420
5020
Purple
1915
6950
1680
6050
Plain (std. spring)
2240
8160
1960
7130
Brown
2710
8750
2380
7650
Black
2720
Not fully open at max air flow
2390
Not fully open at max air flow