Cars in storage but since I'm having a slow day I'll throw this out here.

I'm currently running an Edelbrock 750 on my 350. Mods will be listed below. Anyways the car feels very weak, and ran a best of 14 flat at 98 mph in the 1/4 last year. The car should be much faster, runs out great in 1st and 2nd but falls flat on it's face in 3rd. The more reading I've done I'm starting to think maybe the 750 is a little overkill. Whatya guys think?

350 9.0 compression
L98 heads 2.02/1.60 valves, minor porting
LT4 hot cam
1.6 rollers
Air Gap intake
Changed springs in HEI but can't remember which ones I used - Crane kit.
Holley Blue pump set at 6 psi.
Headers - TES
no cat
SLP cat back
3.70
5 speed


------------------
1985 ASCD Ram Air Trans Am
http://www.execpc.com/~karpsta/home.html
to find out more
-=ICON Motorsports=-

 

I'm thinking the heads are the weak link... Just my $0.02. I don't know what the cam specs are off the top of my head either, but you should be in mid-13s with that.

------------------
1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

 

Carb'd cars that run well through a gear or two then flatten out are typically running out of gas (literally). You've already got a good pump, but how's the filter? Are you trying to pull the gas through an in-tank pump? Do you have rubber lines, especially on the suction side (they might be collapsing)? Is the float hanging up (not dropping to full-open)?

The other possibilities are weak ignition (not sure what you mean by a Crane kit - assume module and coil?); or weak valve springs.

------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, TBD heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

 

Well let me check off some of those.

Fuel line is new 3/8" aluminum line. No intank pump, car was originally LG4.

Sorry, Crane kit I meant was the adj advance kit. I also have Hypertech coil, MSD 6A

Filter was new, bowls were adjusted.

And springs came with the Hot cam kit.

I've thought about the gas situation but just can't believe that is happening. I'll just have to bite the bullit this spring and get a FP gauge for inside so I can see exactly what is happening that way.

 

Check for max advance with vac advance disconnected, too. Should be around 34-36 and be "all in" at 2600 to 3500 rpm, depending on what your motor "likes"

 

Karps, you said your TA was an LG4 right. Does the fuel line go up the passenger side of the engine compartment. If it does and you are running TES then I can just about guarantee that your fuel line is laying on the header and the fuel is getting cooked! Can you say Heat Soak/VaporLock. I fought this for 4 months on my LG4 84 Camaro.

------------------
84 Camaro ZZ4 with HOT cam. 1.88 60' (12.98 @ 105MPH E.T.)
Other Mods: You name it and I have probably changed it.

2001 Dodge Ram Quad Cab 5.9L 4*2

ASE Certified Auto Tech
LIVE AND DIE BY THE ALMIGHTY BOWTIE!

 

That may be possible, will have to take a look at that. But I'm pretty sure when I ran the new line that I stayed away from the header, but again it's worth looking into.

 

Let me know what you find!

------------------
84 Camaro ZZ4 with HOT cam. 1.88 60' (12.98 @ 105MPH E.T.)
Other Mods: You name it and I have probably changed it.

2001 Dodge Ram Quad Cab 5.9L 4*2

ASE Certified Auto Tech
LIVE AND DIE BY THE ALMIGHTY BOWTIE!

 

yes a bit to much if the carb is stock from the box. just buy a 1406's(600) re-calibration kit and gut yours and put the kit on. and enjoy! your dumping in way way!!!!! to much fuel for that engine mine is baically the same!

------------------
1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 heads,350 horse cam,bored.40 over, Edlebrock torker2 intake.

Future mods performer rpm air gap intake (polished) and 600 edlebrock carb, comp roller cam, and way better headsa 400 defintely in the works!

 

I think five7 is on the right track... I've seen it repeatedly.

The fuel line piece in the tank is probably all crusty with years of varnish inside the tube, they always seem to get that way especially if the car has ever sat around alot.

You can check pretty easy: Run it through the gears, let it run in the "flat on its face" mode for a couple of seconds, then instantly cut the ignition and take it out of gear. Coast off to the side of the road and pop off the air horn. DO NOT let the engine run or even turn over AT ALL after you cut it, and don't forget you'll lose PS and PB, and if you turn the key all the way back, you'll lose steering too. I'll bet if you do that you'll find very little fuel in the bowl.

------------------
"So many Mustangs, so little time..."

 

Edelbrocks are great for driving but I've had a couple run out of fuel in the top end. If it isn't black smoking in low or second I don't think it's to rich. You may try to step up the needles and or jets. For ease of tuning [fewer parts] I run all Holleys now. If it were mine I'd try a Holley model 3310 750 vac. sec.

 

Yep you should be MUCH faster than 14's. And No-Way the carb is not too big for what you've got.
The guess about running out of fuel may be right. If the bowls run dry then the engine will be cutting out dramatically and really fall on it's face & doubtful that you'd even go 14 flat @98 if that happened, so I dunno about that guess yet.
I run the same carb you do and it's good to 10 sec ET's and 7000+ rpms, so there is a problem with yours for sure.
I do extensive mods with these carbs and am guessing I could find the problem in a few minutes if it was in my hands right now. I might be able to walk you through some checks remotely, but couldn't promise anything that way. Let me know if you want my help on this one.
good luck


------------------
White 1986 Irocz, 305/383 with Edlebrock Performer-RPM intake and Performer #1407 carburetor, +110hp shot of crack, 700R-4 tranny, 3.25:1 rear, Mcreary Road-Stars, single 3" Borla exhaust, Linginfelter-TPI camshaft pulls 17" vacuum solid. N/A runs 10.9 @124, Crack-runs 10.3 @135... haven't run at track since Oct-99