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91  Camaro Research Group Discussion / Maintenance / technical articles by JohnZ on: August 09, 2014, 02:02:55 PM
Reminder, for those that do not know , JohnZ has posted a series of wonderful articles pertaining to timing , cooling system ,valve adjustment etc.  Written in easy to understand format pertaining to principal/ troubleshooting. I've posted before : great as a refresher or a must read if you are just getting in to theses old cars. Just click on Technical Articles on the home page.

Would help many a poster from running in circles when they are having some issues and are looking for help. Take the time to read over these first , everybody here likes to lend a hand so to speak, and some of the replies just might seem a little clearer. Unfortunately, you just can't stop by with a 12 pack Wink
92  Model Specific Discussions / Trans-Am Camaros / Re: Trans Am racing pace car pics...are there any? on: August 08, 2014, 10:27:33 AM
Agreed, just picking on Darrell a little Grin
93  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 08, 2014, 10:08:30 AM
Ko-lek-tor is correct, check Holley Tech, actually a gap measurement posted. I do not know it off hand.  If he's got the old 30-30 in it ,it's choppy but not overly aggressive. Brakes were fine without an added vacuum reserve tank. Plus the tuning specs for that Z motor has long been in print

Not saying to go do it, but I ran a far more radical cam and had the best luck drilling a small hole in each of the primary throttle plates....per Holley. Never could adjust them open enough to not take out the idle circuit. World of difference. Experimented with accelerator pump cams. (duration) Ended up with a surprisingly crisp ,off idle set up. Must for the street. This was on a 850 double pump.


If I was a betting man, I'd say his problems are in the 46 yo. distributor ....certainly was not a mistake having that old carb gone through also.

Be patient Danny ,your not going to jump in a TEN year old car ,not knowing maintenance history, and honestly expect to have no issues. Also consider it presents as having little attention over the years. All in all ,relatively minor issues, as to be expected with theses old rides...half the fun of owning one.
94  Camaro Research Group Discussion / Maintenance / Re: Running Hot? on: August 08, 2014, 09:07:11 AM
Let me add ,of course having the option I'd run race fuel in the car. Always have. Total agreement.
95  Camaro Research Group Discussion / Originality / Re: Door hinge color on: August 08, 2014, 08:36:55 AM
Ditto.
96  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 08, 2014, 08:35:45 AM
Outside a general tune up ,which is always a plus ,heed the advise from some previous posts and focus on your distributor. Sounds like it may be staying at full advance. Do you own a hand vacuum pump ? (Miti-Vac ?)


1. Disconnect your vacuum line ,plug source, and hook up pump to your distributor.
2. start engine, obtain initial timing.
3.Give a few pumps to full advance. 3 gr. on TAC ? Engine will speed up (good old timing tape on the harmonic balancer a plus here ! Mr Gasket--cheap)You can obtain a reading to see where you are at for full advance. A must to properly set up your curve. ***see weights/springs (previous post)
4. Release pressure on the pump ,does your engine idle back down ?

Something also to be said for adjustable timing lights here.

As far as checking for vacuum leaks: plain old spray bottle with water. I fight fires for a living.

Any issues with your distributor ,just send it out... labor was very fair ,goes through the tumbler ,set up on the good old SUN machine.
97  Camaro Research Group Discussion / Maintenance / Re: Running Hot? on: August 08, 2014, 07:51:49 AM
I run Marine Sta-bil in the boat to combat effects of ethanol in the fuel. SBC is a SBC. On mine it's fed by a low pressure pick up pump and high pressure feed for the fuel injection. These do not like alcohol. Alcohol also acts as a sponge for moisture.  Seafoam appears another popular product with the boaters.

Also is anybody rejecting their carbs? One could assume a lean condition is being created requiring an increase in jet size.
98  Camaro Research Group Discussion / Decoding/Numbers / Re: DF wheels on: August 07, 2014, 04:16:32 PM
04D car, all 5 wheels stamped. Looks like the above link answered it.
99  Model Specific Discussions / Trans-Am Camaros / Re: Trans Am racing pace car pics...are there any? on: August 07, 2014, 03:43:41 PM
http://ts1.mm.bing.net/th?id=HN.608014129215441948&w=98&h=108&c=8&pid=3.1&qlt=90&rm=2

LOL !
100  Camaro Research Group Discussion / Decoding/Numbers / Re: DF wheels on: August 06, 2014, 10:04:05 PM







compare stamps ?
101  Camaro Research Group Discussion / General Discussion / Re: Do You Still Have Your First Car? on: August 06, 2014, 09:59:10 PM
Going through again....digging your pics Daytona yellow.
102  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 03, 2014, 02:50:08 PM
Oh-to answer your other question, The mentioned carbs come with necessary vacuum ports. But,,,isolate your problem 1st before throwing $$$ at it.
103  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 03, 2014, 02:10:42 PM
Good advice from NOYENKO also....if the timing is wandering, or "sticking" at full advance, your engine will  run erratic. Like he posted, very easy to remove from the equation. BTY, CHP was very fair on the price when I had my distributor gone through last year. Plus certification Grin


Heed Gary's advice on carb replacement or rebuild. Food for thought, while your carbs getting refurbished, whatever, you do not need a high dollar carb to feed that 302. Sounds like you are just out to cruise. Don't think any no lift 7800 shifts in your car's future. Check Summit, they carry refurbished Holleys and Edelbrocks. (street avenger ?) You would be surprised the overall performance a 600 Edelbrock does atop that engine...just to tie you over.

Also check out Crane Corvette if you are pretty set on another 780 ,look to have a good rep and descent prices, see what they say.

I cannot see putting out $700 for another carb, when you own the born with...new base plate, metering blocks, neoprene gaskets, blow out protection, needles and seats etc,,would come in half that...







104  Camaro Research Group Discussion / General Discussion / Re: My New '68 Camaro Z/28 Butternut Yellow on: August 03, 2014, 08:19:37 AM
Assuming no bind in throttle pedal or linkage. Return spring stiff and pulling plates (and keeping) them shut.

You had the carb apart. was it rebuilt ? Metering blocks, base plate, body checked for warping ? ( machinist straight edge)

Pull off the air cleaner, have your girlfriend start the car....you operate the throttle and see what it does. Watch the squirters ,at idle, and see if it's getting a signal to pull fuel. Should not at idle. Different circuit. Check your float level ( fuel should slightly weep out the sight holes) Consider upgrading to Holley Viton needle and seats if they have not been recently replaced. Hard to trouble shoot online,,,,,does the car seem to be running rich at idle, exhaust burning your eyes ?

Holley has a great website, take a look Smiley---steve
105  Camaro Research Group Discussion / General Discussion / Re: Air cleaner Decal needed on: July 24, 2014, 09:53:04 AM
Racing aside, I see the benefits of integrating some modern technology into these older race bred engines. Drags are easy, make a pass ,back to the trailer to cool off. Street is far more demanding. Plus the benefits of soft hit rev limiters.....when Shut Down comes through the speakers, and your right foot gets a little heavy Grin
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