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Old 04-05-2021, 08:47 PM   #51
Asshat
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Re: Inline 6 is really tired

Vacuum gauge attached, couple more degrees advanced.

What should it read?

https://youtu.be/g63935rfpFQ
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Old 04-05-2021, 09:26 PM   #52
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Re: Inline 6 is really tired

Right there.
18-20
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Old 04-05-2021, 09:38 PM   #53
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Re: Inline 6 is really tired

Hereís the gauge with me driving down the road.

https://youtu.be/tvFS5cZSXow
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Old 04-05-2021, 09:48 PM   #54
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Re: Inline 6 is really tired

What’s your timing at now?
Vac advance plugged off of course.
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Old 04-05-2021, 10:11 PM   #55
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Re: Inline 6 is really tired

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Originally Posted by geezer#99 View Post
Whatís your timing at now?
Vac advance plugged off of course.
Hard to say, itís past the timing mark. And, at idle, there is not enough vacuum to advance the timing. When I blip the throttle it moves the plate, so I know it works. I believe itís in one of the other videos.

Here me chugging up the hill. I think I need a tach, canít tell what rpm I am at.
https://youtu.be/cs5aiHk9uFc
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Old 04-06-2021, 12:37 AM   #56
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Re: Inline 6 is really tired

I use a Vac gauge on a kneescraper set under my dash.
Idle 700-800 RPM, Oil pressure 40 PSI, 180* water temp at operating temperature, I get 17.5''Hg nominal. 292 L6, .030-Over, Crane 260H cam. GM HEI Distributor.
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Old 04-06-2021, 01:58 PM   #57
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Re: Inline 6 is really tired

The cheap part of me says to put a bottle of Techron Concentrate in it. It will gently and persistently remove fuel system and intake system deposits. And check your timing. Can you hear it knock or ping when going up hill?
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Old 04-06-2021, 02:18 PM   #58
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Re: Inline 6 is really tired

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Originally Posted by mattfranklin View Post
The cheap part of me says to put a bottle of Techron Concentrate in it. It will gently and persistently remove fuel system and intake system deposits. And check your timing. Can you hear it knock or ping when going up hill?
Didnít notice any pinging.
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Old 04-06-2021, 06:14 PM   #59
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Re: Inline 6 is really tired

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So, are you saying a swap to a GMC 305 V6 or V8 would not do much with the same T5 transmission? Why would I need to put in an automatic?

And, a normal aged six cylinder is going to be gutless and have no power to go up hills?

Is a V6 305E worth $300? Local one here, may need rebuild. Not sure if these motors are worth investing, since they are rare, a lot harder to find parts for it.
No I am not recommending a V6....expensive to rebuild for little net gain i performance.

I am recommending a SBC 350...easy swap...more torque...lots of performance parts available....

Any "normal old 6 cylinder" is going to lug in 5th up hills...use the lower gears like 3rd up hills if necessary....

Hope this helps....

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Old 04-12-2021, 11:21 AM   #60
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Re: Inline 6 is really tired

Before pulling the engine I'd check to make sure the carb is the right size. The bore should be the same as the manifold opening. As far as I know 250's and smaller use a smaller bored carb on the same manifold. Whatever the manifold opening is should be the same as the carb. I remember from a 67 1 ton that a 292 should make good power with lots of torque.

Also before pulling the engine I'd try running some cleaner or water through it to clean up the deposits. I pulled a 250 and found out later it had stuck rings which could have been freed up quite easily. I'm not regretting the 350 though except for all the lost time where I could have been doing something more productive.

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Old 04-12-2021, 06:19 PM   #61
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Re: Inline 6 is really tired

Some 292s in bigger trucks had a wider internal diameter exhaust manifold. These are distinguished by the 3 studs on the donut connector instead of 2 studs. The bigger ID flows more CFMs.
This pic is not the best image of the 3-stud intake, but the casting number is visable.
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Old 04-12-2021, 06:32 PM   #62
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Re: Inline 6 is really tired

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Some 292s in bigger trucks had a wider internal diameter exhaust manifold. These are distinguished by the 3 studs on the donut connector instead of 2 studs. The bigger ID flows more CFMs.
This pic is not the best image of the 3-stud intake, but the casting number is visable.
My 292 exhaust manifold has three studs. And, I found a larger header pipe on eBay; 2-1/2. The one on my truck now is 1-1/2Ē. Hopefully it will run better with a bigger exhaust system and carburetor. If I can find a four barrel manifold, Iíll install one of the Quadrajets I have.
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Old 04-12-2021, 10:20 PM   #63
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Re: Inline 6 is really tired

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My 292 exhaust manifold has three studs. And, I found a larger header pipe on eBay; 2-1/2. The one on my truck now is 1-1/2”. Hopefully it will run better with a bigger exhaust system and carburetor. If I can find a four barrel manifold, I’ll install one of the Quadrajets I have.
Befriend a Brazilian truck nut, and Bob's your uncle.

The Offenhauser 5614 would work with that exhaust manifold. That puts you in 4v country.
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Old 04-13-2021, 01:18 AM   #64
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Re: Inline 6 is really tired

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Originally Posted by '68OrangeSunshine View Post
Befriend a Brazilian truck nut, and Bob's your uncle.

The Offenhauser 5614 would work with that exhaust manifold. That puts you in 4v country.
Is this it?
https://www.speedwaymotors.com/Offen...L6,227895.html
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Old 04-13-2021, 01:37 AM   #65
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Re: Inline 6 is really tired

I think this is what I need, just damn expensive!
https://www.ebay.com/itm/250-292-Che....m46890.l49286
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Old 04-13-2021, 02:22 AM   #66
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Re: Inline 6 is really tired

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I think this is what I need, just damn expensive!
https://www.ebay.com/itm/250-292-Che....m46890.l49286
Yeah, that's what I have. I may have bounced the number. Pardon my dyslexia.
$430 USD is a pretty penny. I bought one in 1978. Cost me under a hundred.
Still using mine. The first Holley 390 carb wore out after 25 years. Now I have an Edelbrock 1404 500 CFM.
Try looking fo a used Offy 5416. They last a long time.

I never saw the Aussiespeed intake before. Damn interesting. Will it chamber a Q-jet?
Personally, I never had luck with any Rochester carb, but I'm old and jaded.
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Old 04-13-2021, 11:27 AM   #67
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Re: Inline 6 is really tired

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Originally Posted by '68OrangeSunshine View Post
Yeah, that's what I have. I may have bounced the number. Pardon my dyslexia.
$430 USD is a pretty penny. I bought one in 1978. Cost me under a hundred.
Still using mine. The first Holley 390 carb wore out after 25 years. Now I have an Edelbrock 1404 500 CFM.
Try looking fo a used Offy 5416. They last a long time.

I never saw the Aussiespeed intake before. Damn interesting. Will it chamber a Q-jet?
Personally, I never had luck with any Rochester carb, but I'm old and jaded.
Thatís a nice setup you have there!
Are you running a cam?
Any videos of it running?
How is your exhaust routed?
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Old 04-13-2021, 05:33 PM   #68
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Re: Inline 6 is really tired

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That’s a nice setup you have there!
Are you running a cam?
Any videos of it running?
How is your exhaust routed?
Cam is Crane 260H. P/N 213901.
Sorry no video.
Exhaust is: Clifford Headers -- long tubes -- [about $125 in 1978] into dual exhaust with an ''N'' pipe crossover, long pipes thru turbo mufflers, exiting at angle near rear bumper. Shortbed Stepside '68 C/10.
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