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109176 Posts in 12645 Topics by 4860 Members
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331  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 08, 2014, 02:07:19 AM
#8 - Late valve timing or manifold leak
#9 - Spark plug gap
#10 - Faulty points
#11 - Ignition retarded
#12 - Manifold leaking.. I sprayed carb cleaner all around it the best I could and I could not detect any rpm changes.
#13 - Partially clogged exhaust
It's endless... Danny
332  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 08, 2014, 02:06:32 AM
Well the new carb came. I installed it and heated the engine up to operating temp. I think I may have had/have 2 issues. Cause after I set the Fuel/air mixture with the vacuum gauge the vacuum went up to 12 to 14. However it still wants to climb up by itself at an idle with very little throttle. You give it a little and it winds up by itself. Takes the vacuum gauge down to zero, then races up to 45. I pulled the booster hose and plugged the manifold port and it made no diff. So canister in booster is not leaking. I took it for a ride and it actually runs good, pulls like hell. But I have to leave it in gear and apply the brake to help bring down the idle. Once it is down at the stop sign, it is fine. And off ya go, come to another stop sign and it rides back up. Temp at top of radiator hose near thermostat neck read 164. Temp at bottom rad hose near water pump neck read 172. This is after a 5 mile drive. There is SO many things it could be. The throttle spring is pulling ALL the way back.
#1 - Valve overlap
#2 - Gases passing by the rings
#3 - Sticky Valve
#4 - Burned valve
#5 - Poorly seated valves
#6 - Valve guides worn
#7 - Weak valve spring
333  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 07, 2014, 02:09:55 PM
I think I might have figured out my problem. The only thing I have not done is adjust the vales. Valves out of adjustment? Would that cause the 4.5 Vacuum reading instead of 12 or 14? Going to plug the vacuum line for the brake booster. Maybe it's leaking inside the cannister?.. Danny
334  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 06, 2014, 02:07:23 AM
Well I have to say I did look for a vacuum leak, but couldn't find any. Here is what the gasket looked like when I pulled the carb today. Is this ok? I don't remember any bleed thru like this before. I am not sure why he wanted to put the 2.5's in... I didn't see the vacuum gauge, I think he said 4.5. I just want it right or close to it for the money I spent on the rebuild. If it doesn't work when I get it back tom, going to cut my loses for now and just install the new carb. I wanna go to some car shows in the coming days and weeks. Danny
335  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 04, 2014, 06:08:48 PM
Well the carb rebuild guy just left. He checked it with a Vacuum gauge and sent me down to get 2.5 power valves instead of the 6.5 that are in there. So I don't know what that means, but hopefully it will work, I gotta pull the carb AGAIN, and get everything over to him. Then he said he would help me tune it and dial it in after reinstall. Stay tuned... No pun intended  Grin   ... Danny
336  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 04, 2014, 02:21:27 AM
MO,
 I here ya, but I can't help it. I wanna drive it. I have spent SO much time with everything I need a payoff. And my health isn't the best. It's SO close now.

 So my girlfriend ordered the NEW Holley 0-4053 3923289 today. I will make payments to her when I get caught up. It will be here Wed. morning. I needed something anyway. Now I can send mine out at my leisure and have no down time. 3 days is better than 3 weeks.  Grin
Jerry should be heading back from Reno, as he is up there for the Barrett Jackson Hot August nights. Maybe I can connect with him soon.
 
 I disconnected the vacuum line from the smog pump and plugged it, no change. I did the same with the dist. line, no change. It still does the same thing. The rebuild guy is coming over tom at 10am to check it out. We will see what he can find. Plus I wanna learn after the diagnoses. I had 2 springs on the return and thought maybe that was causing it to pull to the side hard and bind. Like the old Auto Lite Carbs would do. So I pulled the extra one and left the original, no change. It's gotta be inside the carb. When you turn the idle adjust screw just a little to much, it climbs up to 2 or 3 thousand RPMs by itself. Something's gotta be wrong. Stay tuned ... Danny
337  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 03, 2014, 01:18:04 PM
I was looking at that carb cause I thought I had to have THAT one. What's a 3310? Will everything line up and all the fuel connections, linkage and vacuum lines connect properly. I DO NOT want to do ANY mods. Just wanna throw it on and go... As far as sending out my original, I honestly don't wanna wait 15 or 20 days to get it back. Danny
338  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 03, 2014, 11:57:07 AM
My friend rebuilt the carb. He did JUST that for years for a living. So I ASSUME he knows what he is doing. That's how we found the wide open flat track plug in above post. I knew it was going to be hard to explain. I was just hoping somebody had that same problem in the past. There is no binding, have double springs... I did notice at one time fuel was trickling in on the left side at an idle. Then I revved it up and that went away. And didn't come back. All I can say is standing next to the car and reaching in and pulling the throttle back JUST A TOUCH... It goes up, but then begins to climb up on it's own. And I am talking 2 or 3 THOUSAND RPM's. Not just a little. Then I pull it back and it takes 5 seconds to go back to an idle. I also noticed that when it comes back, each time I have to adjust the idle screw. Cause it wants to die, OR it is up to high. Never goes back to the nice 900 idle. There is no longer white smoke coming from the exhaust, and the exhaust does not burn when standing in back of car close and bent down.That was fuel dumping in from that plug being installed. Probably didn't have to change the fuel pump, but that's ok, better to start out fresh. Got an all original rebuilt with the embossed AC logo. Advance plate not sticking cause I checked it and it runs back and forth freely. I retightened the carb down delicately with a 1/4 inch drive mini ratchet holding it in the palm of my hand. Making sure not to over tighten. It should be fine and plenty tight enough.

 I think I may have to just get another carb for now. Cause I WANNA drive it. Then send mine out at a later date. There is a Holley 4053, 3923289 brand new in the box online for $640 with free shipping. Is this ok to run and get me down the road for the summer? Not showing the car. Thanx everyone for the help so far.. Here it is... Danny  
  
                                                                                 http://www.ebay.com/itm/330548530059?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
339  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 03, 2014, 03:17:29 AM
bcmiller here is a shot of the carb numbers. And thank you for checking with Jerry on the pitman arm. I have found it several more places since my post, so I am hoping it is fine, and all those one's for sale are correct with there info.... Danny
340  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 03, 2014, 02:52:37 AM
Well I headed down to Steve's Camaros today. He warranted the caliper and threw in a set of pads. Yes he is a great guy. He is closed on the weekends, but I called his cell and he opened up for me. Scored some nice original '68 parts. Like an original water pump bypass hose, rigid pump to carb fuel line, and some other misc. goodies. I get to walk all over the place upstairs and down and look for stuff. Found original Corvette trim rings in the box. Original diamond mesh air cleaners in the GM boxes, on and on, just a treasure trove of goodies. Went next door to see his cars. He has an all original Hugger '69 Z/28 that he bought back in the 80's. And a nice original black car '68 Z/28 with Cowl Plenum. Also bought in the 80's for just a few thousand!  Cool Cool  Then he took me to lunch down the street. Good times, nice visit.

 On a bummer note, I went back and installed the Caliper and bled it off. Threw the wheel back on and lowered it down. Installed the new fuel pump I got from Heartbeat city. And fired it up to go for a drive and the carb is messed up. Just a touch of throttle and it just keeps climbing up all by itself like it is being giv'in more throttle. But I just was holding it at like an 1/8th of an inch of throttle from outside. Then it takes a long time for it to come back down. You know, instead of racking it and having it come right back down, it goes up... then takes a long time to come back to idle. What the hell is that? I remember it happening to me in high school, but don't remember what it was. I just wanna go for a real ride, instead of the super scary 2 mile ride home the day I got the car off the truck. Couple close-ups of the bypass hose. Nice and close. Oh, and sounded a little arrogant with my last post about taking pictures. I was just quoting Ansel Adams  Smiley... Danny  
341  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 02, 2014, 11:45:12 AM
Jim, yes, that's what I was saying, some old trick for full throttle. I assume it was re-jetted during the rebuild. The guy that built it that's all he did for years is these flat track carbs. Probably over 100 of them. So he MUST know about the jetting. I have only started it for a minute to check for leaks. Front caliper is leaking internally... dang it. I was going to take it for a real drive today. Instead I gotta drive down to San Bruno to Steves Camaro and see if he can warranty this one out... Angry Angry
342  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 02, 2014, 02:23:59 AM
Well I was trying to get the carb tuned and just could not make it happen. So I gave it to a friend for a rebuild. Here is what he found. Apparently this is some kind of flat track power valve mod. You can buy them from Holley, but this one is hand modified and machined. Nice ... If all you want to do is hold the throttle to the floor around a circle track  Angry    P. S. more of those close up pictures ya 'all like. Remember it's not the camera, it's who's behind it that counts.
343  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 02, 2014, 02:16:59 AM
Well here is THAT pitman arm # being talked about and offered for sale. All say replacement for 67 and 68 Camaro Z28. Even some of CRG guys old comments. I found it 20 times for sale all over used and new. And all say for Z28...?? Danny

 Re: 67 Z-28 Steering Knuckle Part Number [Re: KNAPPY]
Zedder Offline

Pooh-Bah

   
I see it as 3908391 and the idler is 3908385.

1968RSZ28:
Chris -

Here's the information I have on the subject...

68 CAMARO w/ Spec. Steering (exc. 302, P/S) . . . . . . . . . .  3908389  (forged 3908391)
68 CAMARO w/ P/S, Spec. Steering (exc. 302),
68 CAMARO w/ P/S (302) (exc. Spec. Steering) . . . . . . . . . . 3908379
68 CAMARO (exc. P/S, Spec. Steering) . . . . . . . . . . . . . . . . 3917575
68-69 CAMARO w/ P/S . . . . . . . . . . . . . . . . . . . . . . . . . . .  3935711


Here is one for sale for $375 right now on TC

ORIGINAL GM# 3908391 1967-68 Camaro Z/28 special fast-ratio 5-3/4" manual steering pitman arm. This arm is for manual steering cars.

Degreased and tumbled to a 100% assembly line correct finish. Ready to install.
344  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 01, 2014, 03:23:51 AM
Hey Kurt, thank you SO much for checking in... Just wanna make sure things are good. I thought I had the pitman arm pictures in here somewhere but maybe not. Here is what I have in my picture file.
 
 What makes you think the carb is original? Is this the norm being dated 4 months away from most everything else on the car? You got many other documented '68 original cars with this early carb dating?
Danny
345  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: July 31, 2014, 01:11:28 PM
JohnZ sorry to bother ya all the time. But follow-up, so I pull the belt, great, NOW...can I ALSO then pull the vacuum line, or should I leave THAT connected? Will I have a vacuum leak if I leave it? ... Danny
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