ACDelco Professional D1321AX Ignition Distributor Vacuum Advance

$ 19.63

Score By Feature

Based on 38 ratings

Satisfaction

9.39

Packaging

9.18

Customer service

9.67

Value for money

9.57

OveReview Final Score

How Our Score Is Calculated

Product Description

By entering your model number, you can make sure that this fits.

Aftermarket replacement that is professional and of high quality.

Delivers the performance and dependability you've come to expect.

Fit, form, and function were all taken into consideration when creating this product.

Mexico is where it all begins.

Questions & Answers

Will this fit a 1978 L48 HEI distributor on a Corvette?

All GM hei distributors equipped with a vacuum advance mechanism will work with this vacuum advance. After 1983, all later models were fully electronically timed and advanced.

How much vacuum (HG) does it require to fully deploy?

According to my testing with a mityvac, it begins to advance around 7" and is completely in by 14".

Will this fit a 1978 L48 HEI distributor on a Corvette?

You should be able to put it to good use. It's installed in a 1976 Corvette HEI. It gives me a total of 12 degrees of advancement. Based on my testing with a mityvac, it starts to advance around 7" of vacuum and is fully in by 14".

Is there a way to change the speed of the vacuum?

A standard HEI vacuum advance is all that is required.

Selected User Reviews For ACDelco Professional D1321AX Ignition Distributor Vacuum Advance

I worked on my 1978 Chevy C20 for a while

5/5

It was a good replacement for the Standard Motor Products model, which only lasted 6 months and left me with a large vacuum leak.

Crosby Hoffman

| Nov 17, 2021

It does exactly what it says

5/5

Fits my 1970 GTO with the 400 engine and performs as expected.

Killian Long

| May 09, 2021

As described, the system is operational

5/5

Throughout time. ACD parts have never caused me any issues. So far, I've been able to make the assumption that the new parts will function as expected. Regardless, I conducted a vacuum test. My previous one had a two-decade life span. the best value for money - That's all there is to say on the subject.