Quote:
Originally Posted by BUBBAS IGNITION
The nice thing in regards to the 390 for a street flathead is the over all adjutability. The vacuum secondary is perfect as is but can be really tuned by replacing the vacuum spring. The spring determines the load at which the four barrell comes in. I would suggest buying the vacuum part that allows spring changes without removing the diaphram and a spring assortment.
I run one of these on my on my sons 1918 dodge with a slant six as well, a couple springs and its perfect !!!!
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Where does one purchase the vacuum part that allows spring changes without removing the diaphragm ?