Re: Inline 6 is really tired
 

Vacuum gauge attached, couple more degrees advanced.

What should it read?

https://youtu.be/g63935rfpFQ

Re: Inline 6 is really tired
 

Right there.
18-20

Re: Inline 6 is really tired
 

Here’s the gauge with me driving down the road.

https://youtu.be/tvFS5cZSXow

Re: Inline 6 is really tired
 

What’s your timing at now?
Vac advance plugged off of course.

Re: Inline 6 is really tired
 

Hard to say, it’s 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 it’s in one of the other videos.

Here me chugging up the hill. I think I need a tach, can’t tell what rpm I am at.
https://youtu.be/cs5aiHk9uFc

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.

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?

Re: Inline 6 is really tired
 

Didn’t notice any pinging.

Re: Inline 6 is really tired
 

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....

:chevy::chevy::chevy:

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.

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.

Re: Inline 6 is really tired
 

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.

Re: Inline 6 is really tired
 

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.

Re: Inline 6 is really tired
 

Is this it?
https://www.speedwaymotors.com/Offen...L6,227895.html

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

Re: Inline 6 is really tired
 

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.

Re: Inline 6 is really tired
 

That’s a nice setup you have there!
Are you running a cam?
Any videos of it running?
How is your exhaust routed?

Re: Inline 6 is really tired
 

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.