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Old 10-12-2019, 08:55 PM   #1
71CHEVYSHORTBED402
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Truck trivia

Thought a thread might be cool with trivia many enthusiasts may be unaware of. I know of a few, but will start with one I recently learned.........

The frame rails on a BBC have cut-outs to allow clearance for the exhaust manifolds. Here's a pic. of the RH side. Edit: Probably a false rumor A 67 frame seems to differ from the others, because a 67 didn't take a BBC. Someone mentioned a 68 differs as well.
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Last edited by 71CHEVYSHORTBED402; 10-24-2019 at 11:42 AM.
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Old 10-12-2019, 09:37 PM   #2
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Re: Truck trivia

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Originally Posted by 71CHEVYSHORTBED402 View Post
Thought a thread might be cool with trivia many enthusiasts may be unaware of. I know of a few, but will start with one I recently learned.........

The frame rails on a BBC have cut-outs to allow clearance for the exhaust manifolds.
This will be a good thread. I love to learn something new every day. Just went out and took a peek at the '70 and it also has the cut outs on the frame rails like yours. I knew I was missing something! BTW, that frame and engine look awesome!
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Old 10-13-2019, 12:56 AM   #3
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Re: Truck trivia

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This will be a good thread. I love to learn something new every day. Just went out and took a peek at the '70 and it also has the cut outs on the frame rails like yours. I knew I was missing something! BTW, that frame and engine look awesome!
Thanks for that. It will be a good day when I get this running, and a better day I know what I did for the engine was an improvement. Ran like a top beforehand, 40K. I only replaced chain, oil pump and most gaskets, but still concerned until she runs again. Everything but the engine and wiper/wash motor is new or rebuilt.

For this thread, myth busting is good too, stuff gets lost, it's been 50 years.

One example I came across after much research involves the idea a 402 BBC with A/C came with a fuel return line. First off it has nothing to do with A/C. Couldn't tell you exactly why, but it involves a 400TH transmission. Prior to 72 a 402/400TH didn't have a return line, 72 they did.

Then you have dealerships that sell two different fuel pump to carb. hard lines for a 402. One "with A/C", and the other without. I haven't confirmed it yet, but it LIKELY has nothing to do with A/C. In other terms, they "fell" for the myth as well. The difference is the fuel pump, not A/C, simply because a return line requires a deeper pump.
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Old 10-13-2019, 11:53 PM   #4
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Re: Truck trivia

I had heard that the wood beds in many of these trucks was to give livestock a better grip when they were transported.

Can anyone confirm or bust the myth?
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Old 10-14-2019, 12:01 AM   #5
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Re: Truck trivia

Quote:
Originally Posted by 71CHEVYSHORTBED402 View Post
Thought a thread might be cool with trivia many enthusiasts may be unaware of. I know of a few, but will start with one I recently learned.........

The frame rails on a BBC have cut-outs to allow clearance for the exhaust manifolds. Here's a pic. of the RH side.



On a side, I have the rebuild blues man. I can't really do anything pending the body dude showing up to finish our dry run.
I think I saw elsewhere on here that the frames are relieved for all trucks after the introduction of the 396 engine in '68. I could see that, simply because there shouldn't be too many different frames, for ease of production reasons. I'm sure that someone more familiar with the ins and outs will come in and eventually confirm/deny my recollection.
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Old 10-14-2019, 08:44 AM   #6
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Re: Truck trivia

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I had heard that the wood beds in many of these trucks was to give livestock a better grip when they were transported.

Can anyone confirm or bust the myth?
That is true.Then pipe stock racks came along with a built in wood floor that you could slide in the box so you didn’t need the wood bed anymore.
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Old 10-14-2019, 09:17 AM   #7
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Re: Truck trivia

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I had heard that the wood beds in many of these trucks was to give livestock a better grip when they were transported.

Can anyone confirm or bust the myth?
It's true Mrs Grumpy doesn't slide around at all .

"The frame rails on a BBC have cut-outs to allow clearance for the exhaust manifolds."

I thought the 67 frame is the only one that needs to be clearanced for a big block ?
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Old 10-14-2019, 09:45 AM   #8
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Re: Truck trivia

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Originally Posted by 71CHEVYSHORTBED402 View Post
One example I came across after much research involves the idea a 402 BBC with A/C came with a fuel return line. First off it has nothing to do with A/C. Couldn't tell you exactly why, but it involves a 400TH transmission. Prior to 72 a 402/400TH didn't have a return line, 72 they did.
Sometimes it's just the way the engineering release is written; there might not be an obvious connection to you or me 50 years after the fact, but at the time it was something easy to latch onto.

For example:

At one point, the cab high running lights were tied to California emissions.

What do running lights have to do with engine emissions, you may ask?

Nothing. But the Federal lights were all amber; California had a law specifying that no amber lighting could be visible from the rear of the vehicle, necessitating a specific part that was blacked out.

Tying these to California emissions was an easy way to make sure the correct regulated part went to the right geographical area.

K
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Old 10-14-2019, 11:34 AM   #9
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Re: Truck trivia

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I think I saw elsewhere on here that the frames are relieved for all trucks after the introduction of the 396 engine in '68. I could see that, simply because there shouldn't be too many different frames, for ease of production reasons. I'm sure that someone more familiar with the ins and outs will come in and eventually confirm/deny my recollection.
I know what you mean. Why have cut-outs for BBC only when they'd work for other blocks as well?

All I know is I've seen a lot of frames without those cutouts. Might be a year thing.
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71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s of OEM identifications and part numbers, all written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025
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Old 10-15-2019, 09:53 AM   #10
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Thumbs up Re: Truck trivia

All 3 frames I have have the cutouts. My 71 C10 the ramp truck and my daughter 68 step all have it.
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Old 10-15-2019, 10:17 PM   #11
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Re: Truck trivia

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All 3 frames I have have the cutouts. My 71 C10 the ramp truck and my daughter 68 step all have it.
I'm probably wrong then. I was speaking from an edgeucation off an old thread. Perhaps 67 frames differ from 68-72 because big blocks were introduced in 68?

I just re-read that old thread. Sounds like 67, possibly 68 and 69-72 were different frames. http://67-72chevytrucks.com/vboard/s...d.php?t=784551
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71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s of OEM identifications and part numbers, all written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025

Last edited by 71CHEVYSHORTBED402; 10-15-2019 at 10:31 PM.
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Old 10-16-2019, 12:39 PM   #12
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Re: Truck trivia

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It's true Mrs Grumpy doesn't slide around at all .
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Old 10-21-2019, 08:25 AM   #13
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Re: Truck trivia

I believe all '68-'72 frames are made the same, to accept any engine offered in that year.

I think the '72 BBC fuel return line only with A/C is related to the A/C to try to cool fuel since A/C tends to bring the temperature up. And the pump to carb fuel line for A/C-only is A/C related because w/AC requires a different pump.
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Old 10-24-2019, 11:38 AM   #14
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Re: Truck trivia

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Originally Posted by special-K View Post
I believe all '68-'72 frames are made the same, to accept any engine offered in that year.

I think the '72 BBC fuel return line only with A/C is related to the A/C to try to cool fuel since A/C tends to bring the temperature up. And the pump to carb fuel line for A/C-only is A/C related because w/AC requires a different pump.
This is out of the part's book. Going by the part numbers, a 1971 402 takes a 6470424 fuel pump only. That pump doesn't have a return line. Consistent with that the 71 takes a single line fuel sender, per the part's book. It's how I found my 71 as well.

Per the book the change occurred in 1972. Couldn't tell you why, but according to the book a 1972 402 with 400 transmission had a return line. I'd only be speculating why the change.
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71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s of OEM identifications and part numbers, all written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025
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