I have a 1981 Chevy C70 dump truck that has a stock 366 big block tall deck in it and curious about what carb to run. It has a holley on it now but not sure of size. Its the one with single inlet with the tube that leaks with the O rings. It doesn't run worth a crap and think I need more carb. Especially when loaded heavy. I have another holley #3310-4 vac sec. Too much? Not enough? What should I use for it. Thanks
The engine itself is in perfect condition. Did a compression test and all cylinders were within 7 psi and the lowest was 138. Just did a plug and wire change now got to square out the carb. Thanks for all the help. Stupid question but a regular 396-454 intake will not fit correct?
You did not mention cap & rotor better change them also check inside of that dist. for things worn out like the advance weights see if the pins they swing on are worn out. you can repair them with a bushing repair kit . also check fuel pressure
I did forget to mention that the dizzy had a plastic piece where the vac advance should be that locked the advance in and I replaced it with a vac advance canister and hooked it up like it should be. I dont see a difference with or without the plate in how it runs for the most part but haven't ran it much. Should I put the plate back?
Go back and take the rotor bug off and see if the advance weight's move free they can seize up lube them ,doesn't take much oil and then see if the pivot pin's have a lot of slop they can still bounce around to affect smooth advance
I checked that last nite and the springs and advance weights were pretty wore. I put new ones on and used the lightest spring to bring advance in early. Going to try the new carb tonite. Also looking for a set of headers since I need to replace the exhaust anyways. Or should I leave the manifolds on there?