bulletnose 0 Posted April 30, 2007 Help! I've uncovered several Holley vacuum advance units sealed in their original boxes, but cannot find an application for them. The Holley tech line is no help--in fact they stated emphatically that they never made such a thing! The part # is 35R-83A and they look like Ford Y-block, but I don't know for sure. Any help would surely be appreciated. Share this post Link to post Share on other sites
Jrope 1 Posted May 1, 2007 Are they single or double diaphram? Share this post Link to post Share on other sites
bulletnose 0 Posted May 2, 2007 This WOULD have been good information--they're a single diaphram. If my skills hold up I'm going to try and get a couple of pictures on as well. Wish me luck. Share this post Link to post Share on other sites
junkyardjeff 49 Posted May 2, 2007 They are either for a Y block or a 49 to 53 flathead. Share this post Link to post Share on other sites
