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Old 03-25-2010, 03:45 PM   #51
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Re: My Vortec 350 at the track, need suggestions

I have an Accel one from AutoZone, and I have a spring and weight kit that makes it come in pretty early as well. I'm running Saturday and taking a timing light with me to get it dialed in
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Old 03-25-2010, 06:47 PM   #52
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Re: My Vortec 350 at the track, need suggestions

keep us posted. we'll help all we can
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Old 03-25-2010, 09:04 PM   #53
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Re: My Vortec 350 at the track, need suggestions

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keep us posted. we'll help all we can
Awesome, thanks for all the replies from everyone. I've learned so much from everyone here and i'm grateful that I can help another fellow TGO member from some of my knowledge learned

Do you think my 10 bolt can handle slicks launching at 2000 rpms? I spoke to a guy today that runs 12.5x's and said he changed his launched from 1500-2000 and picked up 3 tenths in the 1/4 miles but he blew his rear end off an old el camino. But i've also heard of people running 10s on stock 10 bolts.. I just had my new gears installed so I should be fine with only a few passes.
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Old 03-26-2010, 07:08 AM   #54
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Re: My Vortec 350 at the track, need suggestions

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Awesome, thanks for all the replies from everyone. I've learned so much from everyone here and i'm grateful that I can help another fellow TGO member from some of my knowledge learned

Do you think my 10 bolt can handle slicks launching at 2000 rpms? I spoke to a guy today that runs 12.5x's and said he changed his launched from 1500-2000 and picked up 3 tenths in the 1/4 miles but he blew his rear end off an old el camino. But i've also heard of people running 10s on stock 10 bolts.. I just had my new gears installed so I should be fine with only a few passes.
Its kinda "run it till it breaks" . It could break on the first pass, or hang on deep into the 11's. A auto is a little softer hit than a stick.

Let us know how it goes. Hope you post back with a big smile on your face.
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Old 03-26-2010, 07:47 AM   #55
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Re: My Vortec 350 at the track, need suggestions

Hey M1tch.
Your combo is very similar to my own.
I found that the Vortecs like about 34 of total timing. (Not including vacuum advance).
I've limited the mechanical advance in my distributor to 18 and set the initial timing to 16 BTDC. I found a huge difference in part throttle response setting it up this way however it does require modifying the distributor advance slot or using an aftermarket unit with adjustable mechanical advance. Stock units have about 22 of available mechanical advance so you're limited to about 12 BTDC initial.
In a street application, I would always run a vacuum advance as well. When you're cruising on the hiway, the engine will love the additional timing and the result is better gas mileage. From a performance standpoint, the vacuum doesn't enter into it, because as you are aware, vacuum drops to zero at WOT (or it should).
If you have access to a dial back timing light, you can tailor your timing curve without the need for a fully degreed balancer. Conventional thinking says have your advance all in by 3000 rpm. Be sure to do all of your testing with the vacuum disconnected. By the way it's generally accepted that vacuum for timing comes from the ported source but there instances I've read where epople get better results (in their unique circumstances) using full manifold vacuum.
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Old 03-26-2010, 09:40 AM   #56
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Re: My Vortec 350 at the track, need suggestions

i used to launch mine at around 3K and my 10 bolt held together just fine. but i agree....its a run it till it blows up thing.
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Old 03-28-2010, 12:01 AM   #57
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Re: My Vortec 350 at the track, need suggestions

Hey Mitch, congrats on the new best yesterday.....13.10
105 or 106 mph, I think?

And nice meeting you!

I don't think you need to worry at all about that rearend; it's leaving plenty soft with that tight converter. The engine really sounds good when it comes on song though.

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Old 03-28-2010, 10:21 PM   #58
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Re: My Vortec 350 at the track, need suggestions

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Hey Mitch, congrats on the new best yesterday.....13.10
105 or 106 mph, I think?

And nice meeting you!

I don't think you need to worry at all about that rearend; it's leaving plenty soft with that tight converter. The engine really sounds good when it comes on song though.

Thanks alot man it was nice meeting you too, you have a pretty fast truck thats in great shape for the miles We'll have to meet up there again sometime and shoot the **** and race a little bit

I ran yesterday with a set of MT 28" slicks and had some good passes. My transmission is giving me problems with not shifting until real high RPMS. A few times it wasnt until 6500 RPM's and I would have to let off. Looks like i'll be knocking on the shops door that rebuilt it for me. Here are my best times

Run 3

60': 1.990
1/8: 8.440
1/4: 13.100
MPH: 105.89

Best 60': 1.935

I was really impressed with it not shifting right and having a mean bog right off the line at WOT. Its also running lean we pulled a plug and checked it. I'm going to change the pump cam, bump up 3-4 jet sizes and maybe buy my own pair of slicks that are 26" instead of 28". Those 28"s made my gears a little longer and made it harder to take off. But i'm guessing I could easily tap into the 12's with a few slight mods possibily 12.7-12.8s.

Thanks for everyone who has helped me, it means alot to me. I've made alot of improvements with my car over the past year with the help of your suggestions
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Old 03-28-2010, 11:16 PM   #59
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Re: My Vortec 350 at the track, need suggestions

get that sixty in the bottom 1.7/high 1.6 range where it should be and you'll jump into the 12's with both feet. i'd say go up one squiter size, and only 2 jet sizes. 3-4 is a HUGE jump.
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Old 03-28-2010, 11:18 PM   #60
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Re: My Vortec 350 at the track, need suggestions

only way i'd go up more than 2 is if you've got really chalky plugs. i also agree with the mw and go up on the squirter
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Old 03-29-2010, 01:05 AM   #61
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Re: My Vortec 350 at the track, need suggestions

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get that sixty in the bottom 1.7/high 1.6 range where it should be and you'll jump into the 12's with both feet. i'd say go up one squiter size, and only 2 jet sizes. 3-4 is a HUGE jump.
I don't think i will ever hit 1.7s because my stall is pretty low, its not leaving that hard. My squirter is one size up i think its a .38. Is the stumble off the line a lean condition or a rich condition? But 26" slicks and a better launch alone would definately bring me into the 12s. How much is a good jet change worth?
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Old 03-29-2010, 01:06 AM   #62
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Re: My Vortec 350 at the track, need suggestions

depends on how far off you are, when i first put the holley on my friend's car it was pretty far off, i picked up around .4 to the eighth once it was dialed in a little better
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Old 03-29-2010, 06:23 AM   #63
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Re: My Vortec 350 at the track, need suggestions

a #38 squirter is not one size up from factory settings. most factory holley's have a #28 in them. i'm thinking you'll want a #31, or #33 at most.
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Old 03-29-2010, 07:04 AM   #64
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Re: My Vortec 350 at the track, need suggestions

[quote=M1tch;4489215]I don't think i will ever hit 1.7s because my stall is pretty low, its not leaving that hard. ?/QUOTE]

One of the single best things I did was the change to a higher stall. In concert with a 26" treaded slick and 3.73's I dropped a full 2/10's off my 60' time. 1.7's all day with no traction issues.
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Old 03-29-2010, 07:32 AM   #65
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Re: My Vortec 350 at the track, need suggestions

Congrats man!!!

I agree on going to the 26" slicks. When I ran a 700r4, mine wouldnt shift into 3rd or d at WOT. I would have to let out just a bit before it shifted. It hurt my et.

What did you have the timing set at on those runs? Did you do any testing with the timing?

Check to make sure you dont have any slack in the accelerator pump arm.
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Old 03-29-2010, 08:23 AM   #66
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Re: My Vortec 350 at the track, need suggestions

my 700r4 won't do the 3rd under WOT anymore either. poor thing really got mad after spraying the 100 shot lol
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Old 03-29-2010, 09:35 AM   #67
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Re: My Vortec 350 at the track, need suggestions

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I don't think i will ever hit 1.7s because my stall is pretty low, its not leaving that hard. My squirter is one size up i think its a .38. Is the stumble off the line a lean condition or a rich condition? But 26" slicks and a better launch alone would definately bring me into the 12s. How much is a good jet change worth?
It sounded like a lean stumble to me. Very sharp and recovers instantly, not like a rich bog which is more of a stutter or flat sound.
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Old 03-29-2010, 09:39 AM   #68
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Re: My Vortec 350 at the track, need suggestions

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Congrats man!!!

I agree on going to the 26" slicks. When I ran a 700r4, mine wouldnt shift into 3rd or d at WOT. I would have to let out just a bit before it shifted. It hurt my et.

What did you have the timing set at on those runs? Did you do any testing with the timing?

Check to make sure you dont have any slack in the accelerator pump arm.
The timing was set at 35 degrees but the shop that remarked the balancer at TDC said it could be off a few degrees which i think it is. Its saying my base timing is at 15 degrees at idle when it starts perfectly and if i advance it over just a tad the idle improves and so does the throttle response. So I'm wondering if its not off maybe 3-5 degrees. So next time i go out i'll play with it.
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Old 03-29-2010, 02:48 PM   #69
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Re: My Vortec 350 at the track, need suggestions

Is my stumble off the line a lean or rich condition? I do have a fast ramping pump cam for my secondaries.
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Old 05-24-2010, 09:09 PM   #70
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Re: My Vortec 350 at the track, need suggestions

Ran at the track a few times this past Saturday. It was 80+ degrees and humid so I didnt beat my last personal best of 13.1. I was suprised too because my last run was perfect without having any stumble or shifting problems. My 13.1 actually had a mean stumble off the line and me letting off to shift into 2nd! But that was back in March with cooler weather and i upped the jets 2 sizes and maybe my base timing a pinch too high, But I got some good videos out of it. My 2200 stall was only letting me rev to about 1600 too like the brakes were hot or something to hold it.

Heres the video of my worst run on slicks
http://www.youtube.com/watch?v=FTOFd...os=rKtXhz-ePg4
Heres me on 26" street tires spinning hard off the line and trapping 105 still
http://www.youtube.com/watch?v=yf6QzrlTQXM


Best Slicks Run 5/22/10
60' 1.966
1/8 8.55
MPH 82.43
1/4 13.287
MPH 104.29

Street Tire Run
60' 2.138
1/8 8.680
MPH 83.5
1/4 13.356
MPH 105.30

So im waiting until cooler weather in the fall or a cool night before I choose to run her again. Im thinking if i had a 26" slick it would help my ET because the 26 street tires helped my trap even spinning through 1st and getting sideways into second. The slicks kind of bog me down

Oh and Pat my trans was low on coolant! I wasnt checking it right lol
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Old 05-24-2010, 09:27 PM   #71
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Re: My Vortec 350 at the track, need suggestions

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Oh and Pat my trans was low on coolant! I wasnt checking it right lol
I pray to god that you didn't put antifreeze in the tranny :-D
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Old 05-24-2010, 09:56 PM   #72
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Re: My Vortec 350 at the track, need suggestions

Duh I used the green stuff man.. It gets sideways in 3rd now haha

Last edited by M1tch; 05-24-2010 at 10:07 PM.
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Old 05-24-2010, 10:08 PM   #73
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Re: My Vortec 350 at the track, need suggestions

That's progress, Mitch! A 13.2 with the weather here on Saturday is a sure 12.9 in the Fall weather. Glad to hear the tranny issue did turn out to be an easy fix
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Old 05-25-2010, 07:27 AM   #74
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Re: My Vortec 350 at the track, need suggestions

Looking good. You should get some 12.90's in cooler weather, but I think you need a higher rated converter.
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Old 05-25-2010, 07:47 AM   #75
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Re: My Vortec 350 at the track, need suggestions

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Duh I used the green stuff man.. It gets sideways in 3rd now haha

Good good, as long as you didn't use Dex-Cool!
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Old 05-25-2010, 08:06 AM   #76
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Re: My Vortec 350 at the track, need suggestions

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Looking good. You should get some 12.90's in cooler weather, but I think you need a higher rated converter.
+1 and +1
Yank SS3600. And I might just have one for sale in a few weeks
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