May 2nd, 07, 02:51 PM
We're looking for some help on my son's 83 Z28. It is a 305 cu. in. with a 5 speed. Has a computer controlled Q-jet that has been rebuilt but continues to have problems. We are in a State that allows for collector car plates with no emission testing. We would like to replace the carb, intake manifold, and install an early non-computer HEI distributer. I'm wondering if somone out there has made this conversion and the success of it. It would seem to me that it would be a lot easier to tune. Even if we could replace the carb with a spread bore or a regular Q-jet leaving the intake intact, and replace the distributer, that would work too. Any help anyone could give would be appreciated. I know there are a lot of ZZ4 conversions out there so it has to have been done before. Thanks in advance for the help.
Jun 17th, 07, 05:02 AM
i have a 1986 z28 and have the same problems except i have spent almost $1000.00(new q-jet and a dozen sensors and a new ecm) trying to keep it legal and running at the same time! well so much for all that! we do not have emmisions testing where i live so i jerked all the computer garbage out and went with an edelbrock intake and carb,old style hei distibutor and a lock up kit in the 700r4 trans. i haven't finished it yet but will repost when i am done!
Jun 17th, 07, 06:50 AM
83 is the old style sbc...you can get an aftermarket intake(ie performer rpm) for about 150-180 bux...big cap hei is 25-50 bux in any junkyard...i`d go with a holley 600 vsec squarebore, for parts avail and ease of tune...i havent bought a new carb in a while, cuz people give them to me when they cant tune their car right...lmao...everything is very straight forward, and pretty easy to do...look for wiped cam lobes when you get the intake off tho...common problem...