ok guys here goes.....i have a 84 z28 with 700r4 l69 motor and i "sorta" swapped to non cc stuff: accel billet dist., non cc quad rebuilt, eliminated some of the wiring. i still have the ecu in there. so my problem is this, when i installed the dist. i used the old wires, got a non-cc quad and slapped it on plugged all smog fittings i now have all mechanical guages and when i drive it it puylls hard to about 3-3500 rpms then just falls flat, stiff shifts and im stessed cause i cant figure it out someone PLEASE enlghten me im about to swap to a holley and a 2701 edelbrock intake but i dont want the same problems. now the accel dist. has an adjustable vaccum adv. and its at 2 full turn out from being bottomed out, timing is set at 8* and everything else is stock. no cat, 3in pipe to 40 series, new e-fan new accel wires and iridium plugs, fresh gas and oil. im so at a hard spot to get it runnin right but i need some direction. HELP!

 

Sounds like a fuel delivery problem. Although more timing might not hurt (you are setting the base timing with the vacuum advance disconnected, right?).

 

sounds like the secondaries are not opening. you must have vacuum to the diaphragm that controls the secondaries.

 

here is a photo. sorry the pic is tiny

 

What he said.

 

That keeps them from opening when there is vacuum on it, actually.

 

thx guys i checked the av flaps and they were stuck shut. as a matter of fact the av flaps are adjusted right and they sill stick shut so i think im gonna find me a 600 holley with vac. secondaries anyone have any luck with the 600 holley single inlet carb? thx ya'll!!!!!

 

a holley is great. i like to change them to center hung floats and add a secondary metering block.

 

Is the AV stuck shut with the engine running, or with the engine shut off?

 

AV flap? is that the flap over the secondary plates? the secondaries need to be open for the linkage to allow the flap to open.

 

theyre stuck even after i adjusted the spring tension on the AV to "fall" open at WOT with the engine off, i got them to open with the engine off, and yes they are the flaps on the secondaries. i dunno i think i might be better off with a holley, easier to tune, the holley i got irebuilt with the TricKit as its labeled and the floats are side hung are they ok or should i go with center hung bowls? pros & cons between the 2? the car isnt gonna be built for any 1 purpose just a few upgrades to make it fun all around, btw what do i need to get to beable to have this holly work with my automatic tv cable? i just got an edel. 2701 off craigslist for 55$ looks new and unmolested.

 

the center hung floats will allow you to use a drop mount air cleaner for hood clearance. i've use many different types of carbs. i always seem to use a holley. i have carters laying around that i know i can make work but...i can't. a holley is better. in my opinion...oh yeah the tv cable. they both have a different tv corrector bracket that you'll need. i make my own.

 

can u send me some pics of the bracket 4 the tv cable?

 

Yes.

Not true. There is no link between the secondary butterflies in the throttle plate and the "air valve" at the top of the main body.

With the engine running, as I said, the "vacuum break", aka "choke pull-off", will hold the AV closed until vacuum drops sufficiently to release it. This only happens at WOT (or something close to it); it WILL NOT happen if you blip the throttle in the driveway - it takes longer than that for the vacuum to drop low enough (basically, you need a load on the engine).

It appears to me you are not taking the time to understand exactly what is happening with your car. It surely sounds to me like your fuel pump is not keeping up with the demand, and putting on a Holley WILL NOT solve that problem! IF this really is an L69, you likely have an in-tank electric fuel pump AND a mechanical pump on the engine. The in-tank pumps are known to fail with age, and when that happens, the mechanical pump on the engine cannot suck hard enough to pull sufficient fuel through the dead electric pump. If your car doesn't have an in-tank electric pump (reports are that some did not), your mechanical pump could be weak. Check that out before you replace more good parts (personally, my opinion is you changed out the best stuff when you took off the computer controlled carb and distributor, but, hey, it's your car, and it's your money. . .).

 

For the record, you also made your car emissions-illegal by taking off the computer carb and distributor, and the Holley is even worse.

 

well the good thing is its over the 25 year mark so its not emissions tested anymore. also i drove the car and at wot at flaps wont open , i have a vaccum guagr hooked in and i was at 0" of vaccum. fuel pressure didnt drop below 4 psi at wot either. plus it has a 350 short block in itwith all the 305 topend. pocket ported heads and cc matched combustion chambers at 60 cc's. with all sharp edges removed tp help fight detonation. so imo ive improved over the factory design as no othe l69 eqipped cars can even keep up with mine. today im taking the carb to a rebuilder and seein what he says about it.

 

ill check tonite for an intank pump.....got me curious now......