Vacuum advance dist. for Model A

[Dave in MN]

Originally Posted by Dave in MN

I have modified a couple Lucas 25D vacuum/mechanical advance distributors for use on high compression heads. I need three more for engine builds in the works. I get them on Amazon for about $80.00. The lower part of the distributor needs to be machined so it fits the Model A distributor hole.

I ran one on my round trip roadtrip which included touring Alaska last summer without issue. The entire trip was 11,500 miles.

When I modify the next three distributors, I will add some photos to my post.
Good Day!

The vacuum supplied to retard the timing is taken from the base of the air filter. The primary function of the timing advance is from the centrifugal advance weights. The system works very well. I have used it for about 15,000 miles over the past two years.

See photos attached…..