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#1 |
Registered User
Join Date: Mar 2016
Location: Thomasville, NC
Posts: 15
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New to Forum with a question
1970 4x4. 71-72 Grill. Bought it that way but I'm thinking about purchasing the 70 grill again for it!
I've been using it almost as a daily driver for a few weeks now. I do have a question to start off with: Under partial acceleration, maybe 5-10% throttle, the truck seems to have a hesitation after a little time under acceleration. (It doesn't start that way but rather, accelerates, then power falls off. Sputters and loses power. Anything over a light amount of throttle, the issue doesn't exist. I'm not very good at diagnosing these things yet, so i figured I'd introduce myself and ask a question! The truck has the original motor I believe. It's a three speed on the column. I haven't learned a whole lot about the truck and the ins and outs yet, but I'm sure that will come with time. ![]() ![]() PS the pup is Molly. Thanks in advance! |
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#2 |
Registered User
Join Date: Dec 2014
Location: Rockport, Texas
Posts: 192
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Re: New to Forum with a question
Is the carburetor a Rochester Quadrajet? They are notorious for having a "bog" spot if they're out of adjustment.
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#3 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,634
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Re: New to Forum with a question
Welcome!!
Get Molly to help pop the hood and take some pics! And post some more info. What motor, carb, intake? If you don't know, some pics will help. |
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#4 |
Registered User
Join Date: Mar 2016
Location: Thomasville, NC
Posts: 15
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Re: New to Forum with a question
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#5 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: New to Forum with a question
Molly's a beauty! And welcome to the forum!
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__________________
Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#6 |
Registered User
Join Date: Mar 2016
Location: Thomasville, NC
Posts: 15
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Re: New to Forum with a question
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#7 |
Registered User
![]() Join Date: Sep 2010
Location: Formerly MD and San Diego, now loving life in Arizona
Posts: 1,636
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Re: New to Forum with a question
Beautiful truck there. Regarding your bog down, as mentioned earlier, when a Rochester is not tuned correctly, it can give you the problem you mentioned, but before you start adjusting things, take a look at the little filter that is in the fuel inlet to the carburetor. When that thing gets clogged, the engine will run ok (but lean) at light throttle, and die off under harder throttle due to fuel starvation. There might also be a problem with the fuel tank pickup screen being dirty/plugged, but start simple and go from there.
__________________
Alan 2012 Ram 3500 Dually Crew Cab 6.7 Cummins 2014 Palomino Columbus 340RK 5th wheel '69 Chevy C10 396BB |
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#8 |
Registered User
Join Date: Mar 2016
Location: Thomasville, NC
Posts: 15
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Re: New to Forum with a question
Here are some pictures of the throttle body and ignition. Hopefully, this is enough to answer your questions. Let me know if you need anything else to help and I appreciate it!
I'm going to ask a stupid question because I'm pretty sure I know the answer, but I will ask anyway: Is there any way to know by the pictures whether or not if this is a 350? ![]() ![]() ![]() ![]() ![]() ![]() |
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#9 |
Senior Member
![]() Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,365
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Re: New to Forum with a question
Hey 70olbo
![]() ![]() Nice looking ride. ![]()
__________________
A husband can be right...or...A husband can be happy. ![]() 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. ![]() 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc ![]() ![]() JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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#10 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,634
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Re: New to Forum with a question
Most if not all 350's had a 4bbl quadrajet.
Yours is a 2bbl rochestor 2GC. Could of had the 2bbl intake and carb swapped on. You need to find the numbers on the motor to confirm it's size, year etc. You might have a 307. Look here for where to look for numbers and what they mean. http://www.mortec.com/location.htm |
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#11 |
Registered User
Join Date: Mar 2016
Location: Thomasville, NC
Posts: 15
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Re: New to Forum with a question
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#12 |
Registered User
Join Date: Mar 2016
Location: Thomasville, NC
Posts: 15
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Re: New to Forum with a question
At the risk of asking a stupid question --
How in the world are you all seeing the ID's while the motor is still in the truck? I've used a telescopic mirror with a light but my problem is I can't even get the mirror in the right area to know where to even scrub the grime. I've had about 50% of my body leaning over the side trying to look in the driver side area below the distributor cap and can't find the area all the pictures talk about. So I'm not even sure I even have the right area Is it possible to see the ID while the motor is still in the truck? I'm assuming yes, but how? Does anyone have a picture of the area while the motor is still in the truck? |
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#13 |
Registered User
Join Date: Mar 2016
Location: munford
Posts: 12
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Re: New to Forum with a question
the numbers you are looking for is behind the head where the bell housing bolts on....and they are in the cast of the block....another words for that they were in the casting when they poured the block....my 70 model has a 350 with a 2 barrel carb as well but it may have been put in as someone else said....i just changed it out for an aftermarket intake and carb....good luck..
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#14 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,634
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Re: New to Forum with a question
Are you shining the light in the mirror or just using the light to light up the area?
Hold the mirror (a big one) right behind the head at a 45 degree angle and shine the light directly into the mirror. You can't miss it. |
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#15 |
Registered User
Join Date: Jul 2013
Location: Rockwell, NC
Posts: 1,639
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Re: New to Forum with a question
If you want to come down to Salisbury tomorrow afternoon, I'll meet you for a coffee and can help you find some numbers.
__________________
1970 C-10 LWB "Blu" Instagram (current build pictures) 70_nc_c10 |
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#16 |
Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,081
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Re: New to Forum with a question
Good looking truck!
Its not just a later grill, the bumper's been swapped and holes filled in the hood where the emblem would go. I'd yank the carb and put a rebuild kit on it after blasting it with some B12. |
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#17 |
Senior Member
![]() Join Date: Jul 2001
Location: Hyattsville, Maryland
Posts: 3,690
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Re: New to Forum with a question
Welcome to the board from Maryland. That is a great looking truck along with a cute pup!
Ray
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72 Cheyenne Super (Purchased new by my parents in August of 71) Black and White |
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#18 |
Senior Member
![]() Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
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Re: New to Forum with a question
If you look on the radiator side of the engine, passenger side, in front of the head, there is a little half inch wide flat pad. If you clean it, you should see some numbers that end with a 2 or 3 letter code. That code will decipher what engine it is
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68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
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#19 |
Registered User
Join Date: Jun 2014
Location: Lake Tapps Washington
Posts: 386
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Re: New to Forum with a question
If you put the 69/70 grille on then you won't have a bow tie on the front anywhere and you will need to swap bumpers! Sweet truck though! Good luck
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1967 Chevy CST 10 1969 Chevy C/20 Longhorn 1969 K10 Suburban 1972 Chevy Cheyenne Super 10 turned K30 (sold) ![]() |
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#20 | |
Registered User
Join Date: Mar 2016
Location: Thomasville, NC
Posts: 15
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Re: New to Forum with a question
Thanks for the input all! I did not think all the way through on the grill so I appreciate the heads up. I still might eventually do it -- I just like the look of that 70 grill a bunch more.
Quote:
Again, thank you all and I will update as it comes along. For now, I am going to look at a rebuild kit or maybe a 4bbl and intake. |
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#21 |
Registered User
Join Date: Mar 2015
Location: Washington State
Posts: 1,644
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Re: New to Forum with a question
Before you go put an intake on and new 4 bbl carb, did you find out if it is a 350 or not? I would suggest that first before you put money into the engine, for two reasons. The 307 is not a real big motor and can easily be over carbed, the other reason is if you plan to rebuild the motor soon or install a new 350 then I would wait for that time to do this. If no plans to rebuild and it is a 350, have at it. Caution on the 69 - 70 grill, the two main parts to the grill are expensive! 500.00 for the two, so just letting you know they are expensive.
Welcome, great bunch of people here willing to help you. |
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#22 | |
Registered User
Join Date: Mar 2016
Location: Thomasville, NC
Posts: 15
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Re: New to Forum with a question
Quote:
You mention waiting if I am going to replace the 350. At some point, I do want a nice healthy crate in the truck but it sounds like you advise against putting an intake and carb that has been used on the new motor. Is that just to keep everything as new as possible or is that a "bad practice" to do? I keep telling myself, I'm fine to buy stuff now and can just transfer it to the new motor when I do get one. I'm not rushing to get the new motor though ... This one burns oil but it does feel decent. Am I telling myself wrong? |
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#23 |
Registered User
Join Date: Jan 2016
Location: Saskatchewan
Posts: 357
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Re: New to Forum with a question
How about a picture of the SPID.
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1972 C10 - It might be old, but it's not slow |
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#24 |
Registered User
Join Date: Mar 2016
Location: Thomasville, NC
Posts: 15
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Re: New to Forum with a question
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#25 | |
Registered User
Join Date: Dec 2014
Location: Rockport, Texas
Posts: 192
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Re: New to Forum with a question
Quote:
http://67-72chevytrucks.com/vboard/s...d.php?t=282003 |
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