Looking for some help here.
4 Years ago I bought a stock 1968 Dodge Charger with 383 Premium 4 BBL. Somebody had change the carbi to a Webber/Edelbrock, I checked and its the correct replacement for this car. The vacumm advance was not connected, so I tried connecting it to the port referenced in the carbi manual, but it pulled the vacuum advance full on at idle, so I assumed it was manifold vacuum. I tried all the ports and they did the same, so I assumed the carbi did not have a ported vacuum port. I managed to get a fully build AVS, once again the correct orginal carbi for the car. It came with a manifold gasket with a large square hole, rather than the 4 round hold that align to the manifold. The carbi I pulled off had the same gasket, the gasket looked like a Thermoquad gasket. I tried the re con AVS with the gasket it came with, but it also had vacuum at idle on the vacuum advance port. (left hand side next to the mixure screws.) i sourced the correct square bore gasket and this then gave me close to 0 vacuum at idle, but it still pulles the vacuum advance almost fully on when I rev it to arpound 1000rpm and it has a significant surge at lower RPM. I have striped and check the distributor and everything is 100% to spec. I have set the point gap at 17" and set the fixed timing to 5 deg before TDC. I have run out of ideas, why would there be so much vacuum on this port?
4 Years ago I bought a stock 1968 Dodge Charger with 383 Premium 4 BBL. Somebody had change the carbi to a Webber/Edelbrock, I checked and its the correct replacement for this car. The vacumm advance was not connected, so I tried connecting it to the port referenced in the carbi manual, but it pulled the vacuum advance full on at idle, so I assumed it was manifold vacuum. I tried all the ports and they did the same, so I assumed the carbi did not have a ported vacuum port. I managed to get a fully build AVS, once again the correct orginal carbi for the car. It came with a manifold gasket with a large square hole, rather than the 4 round hold that align to the manifold. The carbi I pulled off had the same gasket, the gasket looked like a Thermoquad gasket. I tried the re con AVS with the gasket it came with, but it also had vacuum at idle on the vacuum advance port. (left hand side next to the mixure screws.) i sourced the correct square bore gasket and this then gave me close to 0 vacuum at idle, but it still pulles the vacuum advance almost fully on when I rev it to arpound 1000rpm and it has a significant surge at lower RPM. I have striped and check the distributor and everything is 100% to spec. I have set the point gap at 17" and set the fixed timing to 5 deg before TDC. I have run out of ideas, why would there be so much vacuum on this port?
