ZZ4 and Tach question
Thread Starter
Racer
Joined: Dec 2003
Posts: 411
Likes: 0
From: Arvada CO
ZZ4 and Tach question
Well one of my bosses had someone drop in a new zz4 in his 69 vette and he is wondering if there are any work-arounds as to how to get his old tach to work now... Any ideas /suggestions.? This is a new one to me so I told him I'd ask the experts on the forum. Thanks!
Le Mans Master
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
Originally Posted by Fevre
Use the old dist as long it is in good shape, will need a new dist gear and cap. The cam gear off the new dist might fit right on the old one.
He could use the HEI that comes with the ZZ4 and convert his existing tach to an electronic one. I believe some people on this forum have done this and would have more knowledge of it.
Finally, He could opt to go with an MSD set up which is pricey. This would require a MSD tach drive distributor that will work with his existing tach, and a MSD box to drive the distributor something in the MSD 6 series would work well. Even with the MSD set up he will have to change distributor gears since they are set up for flat tappet cams instead of roller. This is the route I personally chose and it cost me close to 600 dollars since I went with the MSD digital 6 box. With an MSD 6 or 6al box it would cost around 450.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
You can get a tach-drive HEI and use the ZZ4 gear. You can use a 75-77 electronic tach, but the faces don't match. You can have your stock tach converted to electronic-see Clocks by Roger. Mallory used to make a Unilite tach-drive distributor that would work.
