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Old 12-20-2010, 11:44 PM   #101
redhead69
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Re: post latest 1/4 and 1/8 mile times and 60ft.

13.73 with my basically stock 400 sb. 60 mile round trip drive.. cant find my slips but I think they were like 1.88 60ft and 95mph.. Hoping for 12s this year, money allowing
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Old 12-20-2010, 11:48 PM   #102
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Re: post latest 1/4 and 1/8 mile times and 60ft.

Dougminton- nice times, Id like to see what it would run with like a 28" tire and those 4.11s! Man I would think 12.6s-12.8s no problem!
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Old 12-21-2010, 01:34 AM   #103
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Re: post latest 1/4 and 1/8 mile times and 60ft.

Quote:
Originally Posted by dougminton View Post
It spun just a little. I think my trailing arms being a foot shorter than stock helps it plant the tires (used to be a longbed leaf spring truck)


You shortened the trailing arms?
Are they in the factory location (front eyelet) regarding both height and location on the frame?

I was unaware the long beds and shortbeds having different control arm lengths.
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------Motor---------------Bottle
60'---1.53---------------1.41
1/8---6.58 @ 105.92----5.87 @ 118.41
1/4---10.38 @ 126.97----9.24 @ 142.49
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Old 12-21-2010, 01:36 AM   #104
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Re: post latest 1/4 and 1/8 mile times and 60ft.

im taking out my c10 with a hot 400 sbc out in a few days to the track. ill post my times
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Old 12-21-2010, 08:37 AM   #105
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Re: post latest 1/4 and 1/8 mile times and 60ft.

I left the crossmember in the longbed location when I shortened the frame to make it a shortbed. So I designed my own suspension loosely based on the stock stuff. Pic is with everything just tacked together to check the fit.
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fastest 1/4 mile time so far
13.05 @ 104

If you think you have too much horsepower
you obviously have a traction problem !
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Old 12-21-2010, 03:52 PM   #106
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Re: post latest 1/4 and 1/8 mile times and 60ft.

That looks like the stock location for the shortbed as well. I notice you made the front mounting point adjustable, good idea.

Springs appear to be furtner back towards the axle than on a shortbed. That will put less leverage on the spring, meaning you can run a lighter spring rate than a similar weighted truck with stock location. There are pros and cons for this.

My guess on why you are not getting much tire spin at the track would be directly related to gearing and converter. You have a TH400 which has a 2.48 fist gear and a 3.08 rear gear with a 32" tire. Not sure about verter. That combo's means you have an amazingly lazy first gear and you are not hitting the tires very hard at all.

For comparison sake:
TH400 + 3.08 + 32" + 6,000 in first = 71mph
TH350 + 2.73 + 35" + 6,000 in first = 71mph
Powerglide + 3.73 + 28" + 6,000 in first = 72mph
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------Motor---------------Bottle
60'---1.53---------------1.41
1/8---6.58 @ 105.92----5.87 @ 118.41
1/4---10.38 @ 126.97----9.24 @ 142.49
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Old 12-21-2010, 03:56 PM   #107
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Re: post latest 1/4 and 1/8 mile times and 60ft.

shortbed factory location is 12" forward of where mine is. They had just VHTed the track. It'll turn em into smoke at 30 MPH on the street.converter will go 4000 on the foot brake.
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1972 GMC SWB
454 oval ports
TH400

fastest 1/4 mile time so far
13.05 @ 104

If you think you have too much horsepower
you obviously have a traction problem !
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Old 12-21-2010, 07:43 PM   #108
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Re: post latest 1/4 and 1/8 mile times and 60ft.

Quote:
Originally Posted by dougminton View Post
shortbed factory location is 12" forward of where mine is.
If that is the case, then the shorter arm coupled with the geometry change will put more angle in it effectively increasing antisquat numbers forcing the tire in to the ground. Did the rear feel like it raised at all under launch? Or does it stay level or even squat?


Quote:
Originally Posted by dougminton View Post
They had just VHTed the track. It'll turn em into smoke at 30 MPH on the street.converter will go 4000 on the foot brake.
A well preped street im most cases is not as good as a non preped track If they just VHTed it and is hadn't gone away, that could be a major factor.

Quote:
Originally Posted by dougminton View Post
converter will go 4000 on the foot brake.
That's a good size verter, but it is still like a TH350 with a 35" tire and a 2.73 gear. Here is another comparison TH350 + 4.10 + 53" tire = your current gearing. The 4.10's are really going to wake that thing up!!! TQ Multiplication is going to be huge, 29% difference in gearing alone!! Can't wait to see your improvements. Just make sure you have a tire on it that will stick it because I think you are going to need it.
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------Motor---------------Bottle
60'---1.53---------------1.41
1/8---6.58 @ 105.92----5.87 @ 118.41
1/4---10.38 @ 126.97----9.24 @ 142.49

Last edited by Super73; 12-21-2010 at 07:44 PM.
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Old 12-21-2010, 10:09 PM   #109
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Re: post latest 1/4 and 1/8 mile times and 60ft.

Quote:
Originally Posted by dougminton View Post
shortbed factory location is 12" forward of where mine is. They had just VHTed the track. It'll turn em into smoke at 30 MPH on the street.converter will go 4000 on the foot brake.
Dang you must have some good brakes to hold that rpm.
I can barely get mine to hold 3400 before it pushes through.
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Old 12-22-2010, 07:40 PM   #110
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Re: post latest 1/4 and 1/8 mile times and 60ft.

super 73 The back actually lifts about the same amount as the front. C 10 kid In my old race car with hydroboost brakes that convertor went 5200 on the foot brake. Its an 8 inch
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The TEAL GMC build thread is HERE

1972 GMC SWB
454 oval ports
TH400

fastest 1/4 mile time so far
13.05 @ 104

If you think you have too much horsepower
you obviously have a traction problem !
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Old 12-22-2010, 07:54 PM   #111
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Re: post latest 1/4 and 1/8 mile times and 60ft.

You are definately inducing 100% + antisquat then.. Move control arm to the top hole and you will induce even more. When I had mine above 100% antisquat, traction on the unprepped airport track that I was racing was hard to come by as it would shock the tires too hard if I stood on it. Simply lowering the mounting point made a huge difference for the unprepped airstrip. The lower you go, the less hit, the higher you go the more hit. That place hooked as bad as a bad street.. Just food for thought.
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------Motor---------------Bottle
60'---1.53---------------1.41
1/8---6.58 @ 105.92----5.87 @ 118.41
1/4---10.38 @ 126.97----9.24 @ 142.49

Last edited by Super73; 12-22-2010 at 07:58 PM.
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Old 12-22-2010, 09:39 PM   #112
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Re: post latest 1/4 and 1/8 mile times and 60ft.

Quote:
Originally Posted by dougminton View Post
super 73 The back actually lifts about the same amount as the front. C 10 kid In my old race car with hydroboost brakes that convertor went 5200 on the foot brake. Its an 8 inch
Posted via Mobile Device
The hydro boost is genius. I never thought of that for a race application only off road.
That would allow a motor that's boosting a huge advantage.
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Old 12-23-2010, 01:41 AM   #113
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Re: post latest 1/4 and 1/8 mile times and 60ft.

14.1 !!!!! (:
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Old 12-23-2010, 02:12 AM   #114
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Re: post latest 1/4 and 1/8 mile times and 60ft.

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14.1 !!!!! (:
mph??
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Old 12-23-2010, 02:34 AM   #115
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Re: post latest 1/4 and 1/8 mile times and 60ft.

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mph??
r/t .129
60: 2.100
1/4 14.173
mph:94.84



pepd up 400/th350 3:42gear posi. 28tall tire.




first run. 92chevy1500. built 355 alum heads the works. built 700r4. pulled him to the end. we passed the line. he blew a headgakest

good ol' 400sbc
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Old 12-23-2010, 02:49 AM   #116
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Re: post latest 1/4 and 1/8 mile times and 60ft.

My truck made the most gains in the 60 ft. Tight converter and 3.08s 2.20 60 fts.
10'' verter ,cal trac bars and a 325/50 Hoosier drag radial 1.671 60fts. started at 13.50s down to 12.19s
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Old 12-23-2010, 02:54 AM   #117
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Re: post latest 1/4 and 1/8 mile times and 60ft.

yup thats my next thing. vertter. and sticky tires
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Old 12-23-2010, 09:36 AM   #118
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Re: post latest 1/4 and 1/8 mile times and 60ft.

hey doug, that thing is going to move when you change those gears. Let me know next time you take it out, can't wait to see what it picks up.
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Old 12-23-2010, 12:55 PM   #119
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Re: post latest 1/4 and 1/8 mile times and 60ft.

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Old 12-27-2010, 01:37 PM   #120
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Re: post latest 1/4 and 1/8 mile times and 60ft.

I'm new here, my question is what kind of rear suspension set up are you guys running. I have a 71 lwb with a 472cid buick. Like to find a way to quit blowing the tires off.

thanks
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Old 12-30-2010, 06:16 PM   #121
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Re: post latest 1/4 and 1/8 mile times and 60ft.

first run in the 13s!! 13.999 fastest run so far is a 13.98!

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Old 01-20-2011, 10:27 PM   #122
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Re: post latest 1/4 and 1/8 mile times and 60ft.

11.20@120mph.
1.59 60ft
you can watch the run here. The guy i lined up next to was a street racer so he didnt want the time up on the board.
http://www.youtube.com/watch?feature...&v=SCa8-X_wWKs
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Old 01-20-2011, 11:18 PM   #123
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Re: post latest 1/4 and 1/8 mile times and 60ft.

need to post up some pictures and a build thread, bad a--
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7.18- 1/8th mile@95.18
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Old 03-18-2011, 11:28 PM   #124
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Re: post latest 1/4 and 1/8 mile times and 60ft.

1980 longbox
10.94@119mph
1.48 sixty foot
iron headed 468 with th400
33.5 x 15 slick
i will get some pics up later
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Old 03-20-2011, 06:19 PM   #125
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Re: post latest 1/4 and 1/8 mile times and 60ft.

here's couple of pics

Last edited by drag80; 03-20-2011 at 06:20 PM. Reason: picture
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