kryptik
09-21-2010, 10:53 PM
Hello everyone,
I have a zz383 engine with an edelbrock air-gap manifold, tri-y 1-5/8" headers into 2-1/2" pipes. I am using a tko600 trans and 3.50 rear gears.
The engine and carburetor (quickfuel 680 VS with Wilson tapered spacer AND 4-hole phenolic spacer) were involved in a very serious front-end accident. I've recently installed and fired up the engine/carb in a new camaro. The engine seems ok; good oil pressure, no leaks, sounds great cruising at 2500-3000rpm.
As far as the carb...the idle is stable but very rough, the low end torque is gone (the engine will stumble and run rough when getting into 1st or if I'm in any gear below ~2300 rpm especially in 5th), and it also has a rough shaky Wide Open Throttle.
This is not the engine that I put 14,000 miles on before the accident. I tore it down to the shortblock and did not notice any internal damage. So, I am suspecting the carb because the choke mechanism appears damaged in that the fast idle does not work.
I also suspect a vacuum leak because when chasing the threads for the intake manifold, the tap chewed up the two manifold bolt holes before I noticed anything (rear passenger corner). The bolts still threaded in but they could be shaken when in the hole. Perhaps they are not properly retaining the manifold??
Last question...I'm thinking of replacing the carb...I loved the 680cfm vac secondary quickfuel but maybe stepping up to the new 735vs would be better for this engine (some people say 680 is too small but I found that it was great for the street driving I do) Or a different carb altogether?
Sorry for the wordiness guys but it's a complicated situation. Thanks a lot for any help.
Matt
I have a zz383 engine with an edelbrock air-gap manifold, tri-y 1-5/8" headers into 2-1/2" pipes. I am using a tko600 trans and 3.50 rear gears.
The engine and carburetor (quickfuel 680 VS with Wilson tapered spacer AND 4-hole phenolic spacer) were involved in a very serious front-end accident. I've recently installed and fired up the engine/carb in a new camaro. The engine seems ok; good oil pressure, no leaks, sounds great cruising at 2500-3000rpm.
As far as the carb...the idle is stable but very rough, the low end torque is gone (the engine will stumble and run rough when getting into 1st or if I'm in any gear below ~2300 rpm especially in 5th), and it also has a rough shaky Wide Open Throttle.
This is not the engine that I put 14,000 miles on before the accident. I tore it down to the shortblock and did not notice any internal damage. So, I am suspecting the carb because the choke mechanism appears damaged in that the fast idle does not work.
I also suspect a vacuum leak because when chasing the threads for the intake manifold, the tap chewed up the two manifold bolt holes before I noticed anything (rear passenger corner). The bolts still threaded in but they could be shaken when in the hole. Perhaps they are not properly retaining the manifold??
Last question...I'm thinking of replacing the carb...I loved the 680cfm vac secondary quickfuel but maybe stepping up to the new 735vs would be better for this engine (some people say 680 is too small but I found that it was great for the street driving I do) Or a different carb altogether?
Sorry for the wordiness guys but it's a complicated situation. Thanks a lot for any help.
Matt