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04-04-2021, 05:12 PM | #26 |
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Re: Inline 6 is really tired
First fix your brakes.
Try a tune up. How old is the Pertronix? I don't trust them. [GM HEI is a better system and you can get replacements anywhere.] A busted vacuum advance diaphragm might give those symptoms. Or jammed fly-weights in the distr. Pull a compression check. Then consider rebuilding the 292. Bore it .030 over and you get 296 cubic inches. You can get an upgraded cam. Think about aftermarket intakes for a 4 bbl carb. Clifford and Offy make them. Add headers. GMC V6s were tank engines in their day, But finding parts is difficult for an engine that rare. Since your rig is already a 292 truck, stay 292. Stock and aftermarket parts are available for the L25 Chevy engine.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 04-04-2021 at 05:20 PM. |
04-04-2021, 05:32 PM | #27 | |
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Re: Inline 6 is really tired
Quote:
When people hot rod their L6 to sport a four barrel, then there's some discussion. Some folks think the truck won't go forward properly if the carb is oriented sideways. The other school contends that the carb should be aligned so the primaries open equally over both plenums for cylinders 1-2-3 and 4-5-6. Not primaries opening over 1-2-3 and secondaries over 4-5-6. And some ''experts'' say it's too close to matter unless you're drag racing. Personally, I don't mind a sidesaddle carb. In fact it's easier to tune it over the drivers side fender, than bellyflopping across the radiator. But it's a free country.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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04-04-2021, 06:09 PM | #28 | ||
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Re: Inline 6 is really tired
Quote:
Quote:
Compression check - I need to do this. I can see the vacuum advance at the distributor is moving, when I rev the throttle, the vcuum advance is moving the distributor plate and linkage. I don't want to just re-build the I6 - thinking about picking up a GMC 305E V6 - would rather rebuild that motor. I'm just wondering why mine is so sluggish. Same thinking with the Offy intake manifold - if this motor is crap, why should I dump money into an intake or a new exhaust?
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1963 C20, small window, long bed 292, 4-speed |
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04-04-2021, 06:42 PM | #29 |
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Re: Inline 6 is really tired
You have been all over the board between LS engines to V-6 to?
I'm not trying to be a dick but at some point you have to make a decision. I've been in your shoes so not casting stones here...... I would go small block V-8 and don't look back. Just my .02 after a little tequila |
04-04-2021, 06:43 PM | #30 | |
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Re: Inline 6 is really tired
Quote:
It’s all one one plane inside just like a single plane intake. |
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04-04-2021, 06:48 PM | #31 | |
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Re: Inline 6 is really tired
Quote:
I have a 5-speed on the floor, so if I go with an automatic, I got extra setups to do fit that, plus getting a column with the shifter. I’d rather just keep it 5 speed, but want a decent motor that doesn’t bog-out on a slight incline.
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1963 C20, small window, long bed 292, 4-speed |
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04-04-2021, 06:53 PM | #32 |
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Re: Inline 6 is really tired
I'm just sharing what I would do....the crappy part is it costs money dang it Gina!! (joke lol)
It's your stuff and money but at the end of the day what do you want? Personal question but how much do you want to spend? |
04-04-2021, 07:11 PM | #33 | |
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Re: Inline 6 is really tired
Quote:
There’s a 305 V6 that I could pick up locally for about $300. If I did, I would probably just try and get it running and see how it goes. I wouldn’t mind taking a few months to get it rebuilt. I just don’t know a shop I can trust. I think I might do the disc brake thing first - I have a cross member from a 74 C20, just need to buy a steering gear and PS pump/bracket. Also, I have a chance to buy that 305 V6, which you don’t see everyday. So, maybe I should jump on that even if I have to let it sit in my garage for a while before popping it in. I guess my patience is a little short. But, that’s another story.
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1963 C20, small window, long bed 292, 4-speed |
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04-04-2021, 07:12 PM | #34 |
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Re: Inline 6 is really tired
You got 5 speeds.
Use them all to go anywhere. If you need to run in 3rd up a long grade it won’t hurt the motor. Changing to an automatic won’t help. Will be worse. An automatic uses about 25 to 50 hp to work. That’s 20-50 you can’t afford to lose. A big 305 v6 isn’t worth it. Tuff trans hook up. Hard to find too. I’d look for a nice sbc. Anything from a 283 to a 350. |
04-04-2021, 07:41 PM | #35 | |
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Re: Inline 6 is really tired
Quote:
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1963 C20, small window, long bed 292, 4-speed |
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04-04-2021, 07:48 PM | #36 |
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Re: Inline 6 is really tired
That big v6 might be only 300 but by the time you go thru it and spend a big chunk putting it in you’ll have likely spent more than double a simple sbc swap would be.
Have you tried more initial timing beyond the 14 I suggested? |
04-04-2021, 07:50 PM | #37 |
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Re: Inline 6 is really tired
Not yet. I have been thinking about that though. I think I need to do that brake/cross member swap first.
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04-04-2021, 08:45 PM | #38 |
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Re: Inline 6 is really tired
The 292 had a touch more torque that my stock 283 and I dont feel like my truck is gutless
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04-04-2021, 09:33 PM | #39 | |
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Re: Inline 6 is really tired
Quote:
The timing marks only go about 10 degrees from TDC. https://youtu.be/plk1tsYjUwU
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1963 C20, small window, long bed 292, 4-speed |
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04-04-2021, 09:43 PM | #40 |
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Re: Inline 6 is really tired
I didn't. But I think the alignment over center is more important than the Fore-and-Aft School.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
04-04-2021, 09:50 PM | #41 |
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Re: Inline 6 is really tired
My built 292 L6 has a lot more torque and power than the stock 350 in my '71 GMC [1998 crate]. But I put a lot into it.
Do you know what the mileage is? [Odometer not MPG.] So if you go with a V6, LS, or V8, can I buy your 292 Passenger Side Motor Mounts?
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
04-04-2021, 10:14 PM | #42 |
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Re: Inline 6 is really tired
One thing that might be good is to invest in a dialback timing light. Then you could see how much advance you're getting from the vac can as well as the mechanical. It's a great tool to have and you will certainly make use of it again in the future. For my v/8 I bought a degreed tape for the balancer. Those are plenty cheap and do the same job but finding one for a 292 could be challenging unless the diameter is the same as a small block balancer.
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04-04-2021, 10:27 PM | #43 |
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Re: Inline 6 is really tired
The stock, well at least I'm assuming it's stock, 283 in my 63 will slow down some while going up a hill in overdrive unless I give it more gas. In many cases, it is best to downshift so that you aren't lugging the engine. Any time that you're in overdrive, you are decreasing the amount of torque that the engine is putting through the drivetrain. Overdrive is a gear made for cruising. Drop into 4th (1:1) going up hills and you should be good if everything else is good on your engine.
What rear gears did you get with your rear end swap? That will have an affect on it as well, no matter what engine you choose. Easiest swap is a SBC, but you do have to change your passenger side engine mount on the frame because the 292 is different. A stock SBC will work well with your t5. You won't have to swap bellhousings. If you're gonna go LS, might as well set it up with the computer stuff so that you can take full advantage of the fuel. Probably going to have to change transmissions as well.
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Christian Carpenter 1963 C10 - Frankentruck 283, Muncie 3 speed with overdrive Overdrive wiring here1963-ish truck bed trailer - Half-Wit 1981 C10 - Penny 305, th350 --> Soon to be 350, Saginaw 4 speed 1995 Dodge Dakota Sport "I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson |
04-05-2021, 12:47 AM | #44 |
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Re: Inline 6 is really tired
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04-05-2021, 03:25 AM | #45 |
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Re: Inline 6 is really tired
Sounds like an invitation to FOD.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
04-05-2021, 04:03 PM | #46 |
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Re: Inline 6 is really tired
I did a compression check; all cylinders were 160-175.
Even going up a hill in 3rd gear is painful; no power.
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04-05-2021, 04:50 PM | #47 |
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Re: Inline 6 is really tired
Bump up that timing.
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04-05-2021, 07:24 PM | #48 |
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Re: Inline 6 is really tired
Would there be some kinda heat riser flapper deal in the exhaust manifold that could be stuck shut blocking your flow?
Last edited by AcampoDave; 04-05-2021 at 09:48 PM. Reason: Typo |
04-05-2021, 07:44 PM | #49 |
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Re: Inline 6 is really tired
Those are real good numbers. Your engine is not tired. Something's out of whack. We checked for manifold leaks?
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
04-05-2021, 08:25 PM | #50 |
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Re: Inline 6 is really tired
Yes, several times.
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