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07-12-2015, 04:18 PM | #1 |
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Location: Tyler, Texas
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Some questions (pictures soon).
Hi everyone.
I've been recently toying with a project (since my 66 is on hold) on my 1984 GMC LWB. This truck is a 5.0 (LE9) with a TH350 (MX1) and approximately 130,xxx miles. It has sat up some and then I sort of inherit it. That's a story for a different day, however. I will try to add some pictures later, but this is where I'm at (so far). I have checked some of the basics, changed engine oil (some leaks - valve cover gaskets for sure, probably oil pan and/or rear main as well), checked trans fluid (still full and darker red, but not burned surprisingly), and have been removing A/C and emissions equipment (A/C completely empty, not even a hiss, R4 compressor locked, metal shavings everywhere... no emissions hoses stood the test of time, or being parked in rural Texas). Right now, this truck barely runs - partly due to vacuum leaks I caused () and not having a tune-up done in the last 15 years, probably. But, it still starts and runs decently given all of the "damage" I've done. I plan on replacing the intake manifold and carb, regardless, to simplify my vacuum situation and help breathe some life back into this truck. Nothing crazy - I'm thinking this 305 probably doesn't need much more than a 500 cfm carb to begin with. Memory serves me right, they don't breathe like their 4" bore brothers. This is the basic part of my questions, for now... Given the potential for other issues to pop up (haven't popped diff cover, checked suspension pieces, or even figured out exactly what I want besides a long & low cruising truck), I am going to invest in a set of cheaper headers, intake and carb just to get this truck running somewhat reliably right now. Is my cfm assumption (~500 cfm) an accurate starting point? Is there anything specific to the 305/TH350 I should be concerned with? While I'm sure getting a 4" bore engine would be better for performance options, is there a feasible alternative to building what I have into being decent in terms of power? More questions (and pictures) to come, I'm sure.
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Current Projects: 1984 GMC, LWB Fleetside, 305/350 - Currently Doing TBI Conversion 1966 GMC, SWB Stepside, 350/200-4R - Currently waiting patiently. |
07-12-2015, 04:22 PM | #2 |
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Re: Some questions (pictures soon).
A few pics.
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07-12-2015, 04:26 PM | #3 |
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Re: Some questions (pictures soon).
More. Sooner than I thought I'd post them, but my browser was just being ignorant. I put it in it's place.
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Current Projects: 1984 GMC, LWB Fleetside, 305/350 - Currently Doing TBI Conversion 1966 GMC, SWB Stepside, 350/200-4R - Currently waiting patiently. |
07-12-2015, 09:43 PM | #4 |
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Re: Some questions (pictures soon).
Looks like a good truck! Rather than buying a new carb, you would probably be happier and maybe even money ahead, having the quadrajet rebuilt. Once they are built right, they are great carbs! Cheap rebuild will probably result in some drive ability issues. As for the headers, why? Not to sound condescending, but it's a 305. Accept it is a 305 and take it for what it is. Get it running reliable and put the money elsewhere since you are looking to make it a cruiser.
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07-12-2015, 11:04 PM | #5 | |
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Re: Some questions (pictures soon).
Quote:
As far as the carb, I suppose that would be a good option, also. I have better knowledge on Edelbrocks and Holleys, but I'll probably have this one checked out by someone more comfortable with Quadrajets than me, first. Thanks! Don't worry about condescending, you haven't met my wife. I mention headers because I won't have to plug the manifolds (AIR pipes), won't have to jack with the flapper valve, do believe firmly that a decent set of headers provide benefit to an engine that even a lowly 305 could breathe better by equipping them... and most importantly, because I have a set of cheap FlowTech (older style) headers that came off a SBC Nova that I could probably make work with minimal work. But, mainly, that last one.
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Current Projects: 1984 GMC, LWB Fleetside, 305/350 - Currently Doing TBI Conversion 1966 GMC, SWB Stepside, 350/200-4R - Currently waiting patiently. |
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07-13-2015, 01:40 AM | #6 |
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Re: Some questions (pictures soon).
Well that puts it in a different light, free is a much different story - and coincidentally my favorite four letter F-word! By all means run them, but keep the manifolds in case they start leaking!
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07-13-2015, 11:31 AM | #7 | |
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Re: Some questions (pictures soon).
Quote:
It's the kids, I tell ya.
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Current Projects: 1984 GMC, LWB Fleetside, 305/350 - Currently Doing TBI Conversion 1966 GMC, SWB Stepside, 350/200-4R - Currently waiting patiently. |
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07-15-2015, 05:03 PM | #8 |
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Re: Some questions (pictures soon).
Recognize this? Yeah, me neither. I do love that these diagrams don't really add up, sometimes. Here's the issue; I've ripped out much of the emissions and am currently working on rerouting the lines needed to stop my vacuum issues. Curently, I cannot get this truck to even run. Help! I know I have some work to do on my own, but I could sure use a hand in double-checking this set-up. Pictures coming in hot! I've replaced the PCV Grommet (47062 Dorman/Help!) and the Valve was still ok, so I capped off the line running to the canister (It's gone). The exposed AIR tubes and check valves are an exhaust leak, basically, but they shouldn't be keeping this truck from running, right? It's not like a blown manifold gasket keeps your truck from running. I did go back and cap the exposed EGR vacuum line on the valve and it tried to start for a moment, but wouldn't continue running. I ran a fresh line from what I believe is a ported vacuum on the carb to the ignition advance (you can see port in previous photo on L side). It made no difference - the only change was when I capped the EGR valve. Exposed AIR Valve, again. It did run like this for a bit a day or two ago. Sounded pretty terrible, honestly. I used to love open headers, too. Bet I won't anymore. I do not like this thing. I gotta get under the truck and find the other bolt holding it on so I can fully rip it off the truck. I had a really odd knocking noise when it was running with all of this hooked up. I had read that this pump can sound like knock when it fails. I may be wrong (probably) because the knock was never constant with the engine running over idle. Sounded like a loose bracket somewhere. Do I need to cap these Ported Vacuum switches? I doubted it because if there's no signal line going to the switch for distribution, it makes sense that there would be no vacuum leak if nothing was hooked up, right? I know these things do wonderfully to distribute vacuum without having dozens of ports on the carb itself, but I really only want vacuum to my P/B Booster, Transmission, Ignition and PCV system. Cruise would be nice, but I don't really care if I have it or not. This is a heck of a mess. I put a cap on the back of the diaphram next to the EGR. Memory serves it's a vaccum brake for the secondaries. Keep the opening of them smooth. No change to the no-start condition. There is a small line going to the back of the carb from the diaphram so it should still be getting vacuum, but I couldn't tell if the nipple coming off the "top" was open or an adjustment (blind nipple) of some sort so I capped it just to be safe. Thoughts? Suggestions? The odd part about this was the truck did start up and run with a majority of these ports unplugged. But now, it won't? Kinda irritated, of course, but maybe someone can steer me in the right direction. Oh, and the front left wheel (for sure, haven't checked the right wheel) is frozen. No wonder I almost killed myself pushing the truck. I'll get to that after I get it started up and atelast not running so dang badly. I know a carb rebuild is likely in the future, and I may have found a guy nearby to do it who I trust, but I know this truck was running about a week ago. Ran bad, but it ran. I need to get it back to that baseline first.
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Current Projects: 1984 GMC, LWB Fleetside, 305/350 - Currently Doing TBI Conversion 1966 GMC, SWB Stepside, 350/200-4R - Currently waiting patiently. |
07-15-2015, 10:18 PM | #9 |
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Location: KANSAS CITY
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Re: Some questions (pictures soon).
First off nice looking ride, I have the exact same truck, only mine is blue, has a 350, and SM465 manual. I may sound like a hick from the sticks but have a few suggestions for ya. First Carb rebuild, my Rochester Quad needed it when i got it. second; un screw one of those air valves out and go to a hardware store with it and find a copper or steel pipe plug in the plumbing area, Get you two of them and plug those holes up for now. third; Does it still have the factory Catalytic Converter on it?? If so, get rid of it as long as it's not required by your state. It can plug up and cause your engine to die, I had a boss that had the same problem with his converter on a 79 Ford. Last; The only things you need hooked up to vacuum is Distributor advance, brake booster, PCV valve, your cruise control if it works, and a vacuum line to your heater control which should be connected to a round ball shaped thing (a vacuum reserve bottle). Best of luck, it should be a rocking mobile when you get done. Mine is, except mine is getting hot right now, but thats life.
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07-16-2015, 12:17 AM | #10 |
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Re: Some questions (pictures soon).
Thanks, man. The attention usually goes to the 66 sitting in front of it, but this truck was actually a more enjoyable ride. May be remembering the past through rose-colored glasses, as I was a youngin' when my grandfather used to take me places in this truck. Always loved it, and the smell of this truck always reminds me of him.
I will likely be pulling the carb to either tackle it myself or have a friend take a look. I'm not too experience with QJets, and unfortunately, I've suffered expanding my knowledge becuase I bought into the QJet hate early on. I know zip about them other than everyone else's exaggerated horror stories about them. The air valves won't be an issue, as I found a set of old SBC headers I had lying around. They aren't pretty yet (I bought sandpaper and good rattle can paint today with the headers in mind), but they will do the job. No catalytic converter, actually. So, that's good. That's kinda what I was thinking, really. The power booster line is plugged into the back. I ran a new 5/32" line from what I believe to be a ported vacuum line to the vacuum advance. Cruise is still all hooked up, don't know if it works or not. PCV is hooked up. I believe the heater controls are messed up. I had just the supply and return hoses (intake nipple to firewall, radiator nipple to firewall) for my heater system and bypassed the core due to an extremely bad leak. There was no control valve. The problem that's bothering me is that this truck was running and now it isn't. I'm searching for any exposed vacuum I might have made while ripping out emissions stuff. I'll begin the headers and changing the VC gasket tomorrow, depending on my motivation and temperature. This old(er) guy hates sweating buckets.
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Current Projects: 1984 GMC, LWB Fleetside, 305/350 - Currently Doing TBI Conversion 1966 GMC, SWB Stepside, 350/200-4R - Currently waiting patiently. |
07-16-2015, 04:18 AM | #11 | |
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Re: Some questions (pictures soon).
Quote:
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07-16-2015, 04:22 AM | #12 |
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Re: Some questions (pictures soon).
Those files I have got on the Quadrajet have lots of pictures too. Also I have link to several video's on you tube that a guy made on a total re-build of one, as well as he does a great job of explaining the many differences in the Quadra Jet over the years.
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07-16-2015, 03:56 PM | #13 |
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Re: Some questions (pictures soon).
PM Sent. Thanks again, man.
Rant time! You know, I sanded and pressure washed the headers. They're not horrible but I've seen better. They'll work for now. That's not the issue. While sanding/pressure washing I took some time to clean out my carport some. It's filthy and disorganized and I'd just been putting it off. I got in and saw a bunch of nests. Wasp, yellowjacket, etc. If there's one thing I hate it's those flying abominations. What is the purpose to their existence? Having kids (and mild allergic reactions) means they have to go. The chemical spray I use is good, but seems to just tick off the survivors. I've been lucky to not get stung yet (knocking on my wooden desk as I type this), but jeez... common sense dictates to kill them at night, and I'll go back this evening and apply more chemical warfare. But, c'mon. I cleaned and pressure washed my '66 about a month or two ago and there was a huge yellow jacket nest in the rear passenger side bed rail (step side). I mean, massive! 9-10 adults dropped from the initial spray and the rest that returned are swarming. This is Texas, rural Texas. I accept the inevitability of pests. I've shot my fair share of racoons, skunks, possums and coyotes. I spared the fox because, seriously, I like them. But these winged, stinging, good-for-nothing creatures have me seriously considering investing in a flamethrower. I might burn down everything I own in the process of killing them, but they would be gone. End rant. I'll post some pictures of the unsprayed vs. sprayed headers in a bit. Gotta let the swarms die down some.
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Current Projects: 1984 GMC, LWB Fleetside, 305/350 - Currently Doing TBI Conversion 1966 GMC, SWB Stepside, 350/200-4R - Currently waiting patiently. |
07-17-2015, 12:04 AM | #14 | |
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Re: Some questions (pictures soon).
Quote:
Oh crap save the 66 before it gets torched!!!!! Even though i live in town, it's almost out in the country, so I know where your coming from dealing with critters, and wasp's and Mud daubers are just as bad here. I hate those little Muslim terrorists in Midget form.. LOL |
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07-18-2015, 04:54 PM | #15 |
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Re: Some questions (pictures soon).
So, at a bit of a stand still while I wait on things to cooperate. I've got the left front tire off and getting ready to tear down the brakes to find out why it's seized. I've got my money on a frozen caliper. This wheel doesn't budge at all. But, headers! The foot belongs to my amazing 5 year old son. He's not a whole lot of help, admittedly, but he's a great cheerleader for his ol' dad.
These ratty old things came off a 1974 Chevy Nova and were replaced by some high dollar Hooker Super Comps (Cermaic coated), circa 2003. I wish I had kept pictures of that car. It was pretty nasty - not counting the original brown paint job. I digress, however. My father, who is not much of a hot rodder, painted them red and used them as lawn ornaments. He was probably a Ford guy in his younger years. Atleast I learned better. I sanded them down, cleaned 'em up, pressure washed off what I could and used VHT's ceramic coat, hi-temp rattle can magic to give them a nicer look. I'm sure they'll probably die very soon, but hey... looks better than the red! Make sure, for anyone not used to painting headers, you pay attention to the process to cure this stuff. Due to the issues with the aforementioned stinging pests, I haven't done much else as of yet. But, I have a feeling my no start could be fuel related. So I've added some fresh gas to the tank and will let it fully charge before seeing if it helps. The gauge was reading just below quarter - but I'm pretty sure that thing was inaccurate years ago. If not, no big deal, after I get the frozen wheel resolved, I'm gonna hit that carb with some much-needed love. Oh, and I got bored so I started cleaning off the wheels on the Armada. ADD is a hell of a thing. It came with these wheels when we bought it. I don't like 'em. But they were dirty. First pass made a world of difference. It has these crummy black plastic inserts but after one flat having to remove 10 allen screws on the outside, ten allen screws on the inside (different size), one allen screw on the center cap, and searching for the wheel locks... I decided someone would actually be doing me a favor stealing them. I don't like chrome wheels, and I don't really mind 22s, but these wheels are my bane.
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07-19-2015, 05:45 AM | #16 |
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Re: Some questions (pictures soon).
Blessed I have my own 11 year old cheerleader, like yours, he's more spiritual help than anything. LOL Those headers don't look bad at all, at least from the looks of it you should be able to change your plugs fairly easily. Mine aren't too bad till you get to the passenger side, then you have to break out the (Jesus Wrenches) to get to it. If not you gonna need a new set of exhaust gaskets, because one of the plugs is so far underneath, no way can you get a socket on it.
I told you how to get rid of those little stinging bastards, Nuclear weapons!!! And chemical warfare. Surely you boys in Texas have managed to save some of the good stuff to do that with, specially as bad as the damn fire ants are down there. LOl Dude with those wheels on that thing, you may have to help the thief steel them. You may have to take the things off yourself and set them out on the curb, with a sign that says free.. LOL Oop's I missed the brakes.. LOl Have fun with that I need to do mine too. But they are gonna have to wait one more month, got to do that damn radiator on mine, think I have one lined up, just need to go check it out this morning. |
07-19-2015, 01:04 PM | #17 | |||
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Re: Some questions (pictures soon).
Quote:
Quote:
Quote:
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07-19-2015, 01:51 PM | #18 |
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Re: Some questions (pictures soon).
Move the vacuum advance to manifold vacuum. Ported vacuum is more emissions nonsense. See first three posts here.
http://www.hotrodders.com/forum/dist...1-a-59033.html
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Rich Weyand 1978 K10 RCSB DD. |
07-19-2015, 02:28 PM | #19 | |
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Re: Some questions (pictures soon).
Quote:
I can't think of anything that you'd find on these trucks, besides the advance before reading those posts, that would need it now. That might make my vacuum routing much, much easier.
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07-19-2015, 03:28 PM | #20 | |
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Re: Some questions (pictures soon).
Quote:
BTW, don't lose the PCV valve. Blow-by from the rings will condense in your crankcase and turn into sludge in your oil. The PCV valve allows the engine to pull those vapors out of the crankcase. The difference when you pull a high-mileage engine apart between with-PCV and without is unbelievable. One is pretty clean and the other is all garped up with sludge. You don't see PCV valves on race engines, because they pull them and rebuild/replace them so often. Street engine, different matter.
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Rich Weyand 1978 K10 RCSB DD. |
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07-19-2015, 03:35 PM | #21 | |
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Re: Some questions (pictures soon).
No. I currently have mine bypassed so the vacuum always opens the manifold flapper as soon as the truck starts.
Quote:
When I first got my truck, the PO had the timing so screwed that the idle screws were completely backed out and the engine was racing. Fixing the timing meant screwing that back in until it could stay running. Something else to consider. |
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07-19-2015, 03:56 PM | #22 | ||||
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Re: Some questions (pictures soon).
Quote:
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Timing wise, I don't think this truck has been touched much since my grandpa got it in 84. It ran ok prior to my emissions-stripping, and I have a few things I need to quit procrastinating about and just do. There's some work to be done, for sure, but it'll be a solid truck.
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07-19-2015, 09:22 PM | #23 |
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Re: Some questions (pictures soon).
Well, you already have a properly connected PCV valve on the driver's side, and a breather on the passenger side. You can reverse those if you want, but one side should be a PCV valve and the other a breather, so you get air flow through the engine.
Note the size of the PCV valve fitting and the associated carb fitting. Your carb fitting already points to the driver's side, so I would leave it where it is. Just make sure the valve rattles when you shake it up and down. That's normal, and proves it isn't stuck.
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Rich Weyand 1978 K10 RCSB DD. |
07-20-2015, 05:28 PM | #24 |
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Re: Some questions (pictures soon).
After proctrastinating a little, I decided to get out and get the caliper changed. I'm wanting to get this thing rolling and the jackstands had sunk about 1/2" into the old asphalt in out driveway. Not good.
I could've sworn this was a heavy duty brakes truck. Turns out I gambled and lost. My rotors are the light duty 1" rotors. I swore that most of these trucks used the HD brakes, but it's not a big deal. Swapped the caliper for the right one, got it in place. Wheel spins freely now. But, I must have missed a step somewhere. Had the Mrs. pump the brakes to start bleeding the system and... the caliper still hasn't moved. Got the new copper washers, no leaks, plenty of fluid in the M/C. Huh. I cracked the bleeder screw and I'm getting nothing. It's not a total loss, as we've been using the Armada to pull it around at low speeds and the drums are pretty solid so it can atleast be moved, but that just bugs me. So, all in all, I yanked the caliper today, slapped on the new one and got it off of jackstands... so far. I disconnected the wire going to my electric choke and, while it's staying open still, the battery charger actually green-lighted me this morning (indicating full charge) which is great, will go to check if she runs or not. I hooked up my advance to manifold vacuum (thanks again, rich!) and added some fresh fuel... We'll see in a bit.
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Current Projects: 1984 GMC, LWB Fleetside, 305/350 - Currently Doing TBI Conversion 1966 GMC, SWB Stepside, 350/200-4R - Currently waiting patiently. |
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