Hi guys,
I've been doing some tweaking with my set up too and wanted to let you know what I've found out. My set up consists of;
292-.040 over to 301 CID, 272 Cam, Stovebolt Headers, Petrox electronic Ignition, 3x2 Offy with Holley/Webers. The set up was done with straight linkage because the carbs are progressive. I found out that the secondaries on these carbs are very strong and big and made for a hard pedal. I loosened the spring pressure a little by adding a return spring that still provided a good safety margin but still had a stiff petal. At full throttle, the car actually bogged down and slowed. I do not have anything special head work that probably accounts for this. What are the CFM's on these carbs? I've heard 390-500cfm. Which is right? I believe they are 390's because 3x500's would be nuts on a street motor. I disconected the outer secondaries so they do not open but left the secondaries on the center carb. I found the performance smoother and seems to want to go to 7,000rpm with out any problems. I will not try that. It still has the same low end grunt that it had before. My idle is smoother and I believe the milage is up a few mpg's. Has anyone done this with any sucess or am I defeating the system by all of this tinkering?
