Inline 6 questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ol'Blue70 · 08-23-2017, 12:37 AM

Hi all, I know I haven't been on the forums recently. I haven't been able to work on my '70 very much this summer. Now that things are starting to slow down, I'm getting time to work on it.
My first question is: I put installed the engine/transmission as a whole. I got the transmission mount bolts to line up and have it loosely bolted to the frame. I'm having a hard time getting the motor mounts to line up though. I've tried lifting the engine up with a hoist and trying to slide the engine slightly, but it won't move.

Second question: being a 1970, my truck originally came with a linkage operated carburetor. I have replaced that engine with one from a newer vehicle. I believe it is a 1979 block. The carburetor on this engine is cable operated. I have an accelerator from a parts truck that was '71-72, but I don't have the cable to go to it, nor do I know how the cable should be routed. Does anyone on here have a '71-72 with the inline 6 that could give me some advice?

FL71C10 · 08-23-2017, 05:38 AM

I can't speak for the cable routing, but I think you'll also need a new gas pedal assembly

RichardJ · 08-23-2017, 12:14 PM

>> I believe it is a 1979 block.<<

The '79 250 was the Pulsair 4.1 engine with integrated intake manifold.
If that is the engine you have, this would be a good time to replace the head or find a pre-'79 250 engine or a 292 engine.

Converting to the swing mounted pedal with cable is best done with the engine out. You will need to weld up some old holes, drill new holes and tack weld some nuts on the outside.

68gmsee · 08-24-2017, 10:26 AM

Re. the engine to motor mounts lining up: try loosening all the mount bracket bolts to see if it buys you anything. I've encountered this problem on a v8 and loosening the bolts helps.

On the throttle link problem. A pic would help to see what you have. I have found that when mixing up new and late year parts on these trucks, a lot of times you have to resort to either after market or making your own brackets, etc.

68gmsee · 08-24-2017, 10:53 AM

Olblue70, I found this old post that may help you with the throttle linkage.

Towards the bottom is a pic posted by PICKMUP.
http://67-72chevytrucks.com/vboard/s....php?p=2503437

Ol'Blue70 · 08-26-2017, 01:04 AM

Quote:

Originally Posted by 68gmsee

Olblue70, I found this old post that may help you with the throttle linkage.

Towards the bottom is a pic posted by PICKMUP.
http://67-72chevytrucks.com/vboard/s....php?p=2503437

That is exactly how this engine is set up! The bracket is already installed on the engine. I just don't know where to get the cable that's already the right length for a '71-72 truck.

As for the motor mounts, I will try to loosen them up and see if that helps.

68gmsee · 08-26-2017, 09:55 AM

Quote:

Originally Posted by Ol'Blue70

That is exactly how this engine is set up! The bracket is already installed on the engine. I just don't know where to get the cable that's already the right length for a '71-72 truck...

If you can't find it in salvage yards you can place an ad in the "want to buy" section of this site or call some of the vendors to see if they even make it or have one that is similar then customize it yourself. I've done that in the past.

**HO455** · 08-28-2017, 09:27 PM

Try sending a PM to grumpyoldman. He's I-6 man!!

D13 · 08-30-2017, 06:33 AM

Summit has a selection. Highly recommend running a piece or wire along the proposed route, then measure both the sheath and cable length. If needed you can buy Morse type cables and custom cut them - Lokar comes to mind.

08-23-2017, 12:37 AM	#1
Ol'Blue70 Registered User Join Date: Feb 2017 Location: Iowa Posts: 13	Inline 6 questions Hi all, I know I haven't been on the forums recently. I haven't been able to work on my '70 very much this summer. Now that things are starting to slow down, I'm getting time to work on it. My first question is: I put installed the engine/transmission as a whole. I got the transmission mount bolts to line up and have it loosely bolted to the frame. I'm having a hard time getting the motor mounts to line up though. I've tried lifting the engine up with a hoist and trying to slide the engine slightly, but it won't move. Second question: being a 1970, my truck originally came with a linkage operated carburetor. I have replaced that engine with one from a newer vehicle. I believe it is a 1979 block. The carburetor on this engine is cable operated. I have an accelerator from a parts truck that was '71-72, but I don't have the cable to go to it, nor do I know how the cable should be routed. Does anyone on here have a '71-72 with the inline 6 that could give me some advice? __________________ Ol'Blue70 1970 Chevrolet C20 - 250/SM465/4.11 - grandfather's truck - long term restoration 1999 Chevrolet K1500 Classic - 5.0/4L60E/4x4 - daily driver 1969 AMC Rebel SST - 232/3spd auto - project/show car 1973 John Deere 110 - K181 Kohler 8 hp/ 38'' deck

08-23-2017, 05:38 AM	#2
FL71C10 Registered User Join Date: Jun 2010 Location: Orlando, Florida Posts: 2,506	Re: Inline 6 questions I can't speak for the cable routing, but I think you'll also need a new gas pedal assembly __________________ 71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now.

08-23-2017, 12:14 PM	#3
RichardJ Registered User Join Date: Apr 2010 Location: So Cal Posts: 1,413	Re: Inline 6 questions >> I believe it is a 1979 block.<< The '79 250 was the Pulsair 4.1 engine with integrated intake manifold. If that is the engine you have, this would be a good time to replace the head or find a pre-'79 250 engine or a 292 engine. Converting to the swing mounted pedal with cable is best done with the engine out. You will need to weld up some old holes, drill new holes and tack weld some nuts on the outside. __________________ '67 GMC 2500, 292, 4spd, AC

08-24-2017, 10:26 AM	#4
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Inline 6 questions Re. the engine to motor mounts lining up: try loosening all the mount bracket bolts to see if it buys you anything. I've encountered this problem on a v8 and loosening the bolts helps. On the throttle link problem. A pic would help to see what you have. I have found that when mixing up new and late year parts on these trucks, a lot of times you have to resort to either after market or making your own brackets, etc. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...

08-24-2017, 10:53 AM	#5
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Inline 6 questions Olblue70, I found this old post that may help you with the throttle linkage. Towards the bottom is a pic posted by PICKMUP. http://67-72chevytrucks.com/vboard/s....php?p=2503437 __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...

08-28-2017, 09:27 PM	#8
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,804	Re: Inline 6 questions Try sending a PM to grumpyoldman. He's I-6 man!! __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

08-30-2017, 06:33 AM	#9
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: Inline 6 questions Summit has a selection. Highly recommend running a piece or wire along the proposed route, then measure both the sheath and cable length. If needed you can buy Morse type cables and custom cut them - Lokar comes to mind. __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors



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