[71 T/A]

I posted this here because my car is mainly street driven.

69 GTO with a/c, 4000 lbs
461 with KRE 308 heads ported by SD
236/245 Old Faithful HR cam
Torker 2, runners worked by SD
950 HP Carb
3200 Stall Continental converter
3.55 12 bolt
Doug's headers into 3 inch pipes then 2.5" Goerlich Xlerator mufflers and 2.5" tailpipes
MT Drag Radials, 275-60-15

Was hoping for 11.90s, but ran 12.38 at 110.
Shifted at 6200-6300, Ran without air cleaner on, which helped times
Did good burnouts, 60 ft no better than 1.88 yet car hooked very well.
Do I need more stall, like 4,000-4200?
Should I go to full 3 inch mufflers and tailpipes?
Gonna try Wilson Manifold tapered 1-inch spacer

Amazing, pulled both hood scoop inserts and car ran way slower, into the 13's.

[tom s]

60s seem high to run a 11.Any idea where the engine made peak HP?That car weight and that gear might like a RPM better?Tom

[straycat]

What was the weather? What was your launch rpm, or just hit the pedal off idle. Did you try any other shift points. Go to a T & T start lower rpm. I'd be careful with the convertor for a street car. That 60ft seems right for a 12.40 but were the tires hooking up. 11.90s should be well within reach with that combo which should be making lots of hp. Also the mph is right for 12.40 but too low for 11s. It should really be pulling in the lights.

[Blued and Painted]

Hope the a/c belt is removed. The clutch bearing wont take it for long.

Need some details on the ignition system.

[JSPONT]

Did you play with timing and carb jets? How many passes did you make? How was fuel pressure the entire run? Your stall could be hurting your 60' foot.

[scott70]

that setup should be in the 11's as it sitting. Timing and jetting optimized? Those things alone can be hurting you alot if theyre too far off. Your 60's should be able of 1.6's which would help and your mph should be in the teens easy. Odd how removing the scoops hurt the ets that much or at all actually..

[Formulas]

Scoops could be a indication of bad carb calibration?

[6D9]

Dont get discouraged its the first time out with it. What was the total timing? Did you verify its getting 100% full throttle? I would go full 3" exhaust as well. Also need to verify A/F ratio.

[68blackbird]

First time at the track with the combo?

If so, I wouldn't switch parts out yet. Check the basics, fuel pressure, timing, play with the jetting. You may be surprised how the car performs shifting at 5500 rpm. Try some different launch technics and shift point.


Rich

[FrankieT/A]

Originally Posted by 68blackbird

First time at the track with the combo?

If so, I wouldn't switch parts out yet. Check the basics, fuel pressure, timing, play with the jetting. You may be surprised how the car performs shifting at 5500 rpm. Try some different launch technics and shift point.


Rich

X2 on lower shift point try 5500 RPM

[ta man]

My combo first time out ran low 12's .What does your fuel system consist of?Also you are shifting way too high.Try shifting around 5500rpm.Your build is very similar to Torquewar's and mine.A one inch spacer is worth a Cpl tenths.What is your rocker ratio?Stock jetting in the 950hp is pretty close,plug the rear power valve and go up 8 sizes make sure you have jet extensions.What is your total timing?

[71 T/A]

Originally Posted by ta man

My combo first time out ran low 12's .What does your fuel system consist of?Also you are shifting way too high.Try shifting around 5500rpm. Your build is very similar to Torquewar's and mine.A one inch spacer is worth a Cpl tenths.What is your rocker ratio?Stock jetting in the 950hp is pretty close,plug the rear power valve and go up 8 sizes make sure you have jet extensions.What is your total timing?

Compression is 10.5
Tranny was rebuilt with B&M Transpak in 2003 and should shift a bit harder, may need a rebuild
New MSD Pro-Billet Distributor and 6AL2 Box
Per Kauffman's instructions set total advance at 30, initial is 15 (16 pinged)
New Aeromotive tank with in-tank fuel pump and 1/2 inch fuel line. Fuel pressure at 7.
Car stalled 4 times including twice before doing a burnout, never stalled at launch.
Jet extensions should help.
Will shift at 5500
May go to full 3 inch exhaust with Ultraflow Welded mufflers and 3 inch tailpipes

TA Man, what do you mean by going up 8 sizes - in jetting or rear squirters?

[johnta1]

When blocking the power valve, you must jet up around 8 jet sizes to compensate.

[71 T/A]

Rockers are 1.65 Crower stainless rollers

[Half-Inch Stud]

Good combo that needs tuned-in. A few tnt runs for total ADV & mixture.

Still though I can't resist to advize: " Try a Q-JET and see if the problem goes away"

[6D9]

Did you verify that its getting full throttle??

30 degs of total timing seems way low. When at the track try some better fuel with more timing. 34-36 should be close to ideal. Since the car is hooking but still 60 footing soft that really helps point to not enough timing or lack of full throttle. Good luck with it you will get it. The combo is very close to my buddies 66 that I help him with at the track.

[Tiger Paw]

That combo is limited by the small pipes and mufflers. Research plug reading and make clean cut passes to checkout plugs. It may need a few more degrees of total timing, but be careful. No pinging or rattling.

[jonmachota78]

30-31 deg is where you want to be with those heads! I agree with others, you need the jet extensions and block the rear power valve and jet up. You may want to do the piston stop thing and verify TDC so you know your timing is correct. An AFR guage or a dyno session would be good to nail down the carb jetting. I love my AEM and it was cheap.

[71 T/A]

Originally Posted by jonmachota78

30-31 deg is where you want to be with those heads! I agree with others, you need the jet extensions and block the rear power valve and jet up. You may want to do the piston stop thing and verify TDC so you know your timing is correct. An AFR guage or a dyno session would be good to nail down the carb jetting. I love my AEM and it was cheap.

Car stalled 4 times including twice when I was about to do a burnout. I was attributing it to low idle setting but may be the lack of jet extensions.

[Formulajones]

That particular engine combo, converter and gear, should be well into the 11's at that vehicle weight.
I know Kauffman recommended 30 degrees, probably as a precaution. Because when we ran similar heads and camshaft from Kauffman himself on a 463 we heard the same thing. However the engine made best power on the dyno at 34 degrees. In my fathers stock weight 69 GTO with a 10" continental and 3.73 gears with a 30" tire. It ran 11.40's with nice wheelies. His best short time was 1.59. His car scaled just over 3900 with him in it.
We ran an RPM air gap on this engine with a 1" spacer, and he ran an original 69 GTO ram air setup on it, complete with cable to work the scoops. 950HP carb, no jet extensions, but I did recalibrate the circuits a bit and a small jet change using a wideband to set it up.
We feel the car had quite a bit more in it but never got to test as much as we would have liked, and weather was always hot with crappy DA.

If I were to try the Torker II intake like yours, I definitely wouldn't be running that without some form of a spacer. Probably a 4 hole taper is what I'd be looking at on an open plenum single plain like that. When we tried a single plain intake on this engine with no spacer on the dyno it absolutely killed the power, both HP and TQ was down. RPM intake back on and it all came back, and a 1" open spacer on top of that intake was worth another 12 HP with no effect on TQ.

Keep tinkering, you'll find it. Sounds like the car just needs more tuning.