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16  Camaro Research Group Discussion / Maintenance / Re: Running Hot? on: July 31, 2014, 12:46:41 PM
Really does begin to sound more like a flow problem. Flush the system with the best product you can find, change the water pump and the thermostat. Check and/or change the cap - you need to run about 12-15 psi in the system to make it work properly. If no big improvement, I'd take the radiator out and replace with another known used clear radiator, or a cheap repop just to isolate the problem. Or, just core the old one like most of us are having to experience.

What does the coolant look like ? Dark colored, any foam in it ? Leaking head gaskets can cause hot spots/steam pockets like this. Oil clean ? Any coolant contamination ? Hoses collapsing ?

Bad flow across the radiator could also be a culprit, as we conjectured before. Bet the lower half is plugged - that's why the temp is so low in the bottom half.

One other thing - I witnessed a big block Chevelle do this once upon a time - turns out it was spun bearing (main), causing the engine to not only run hot, but choke down and die when it warmed up enough to start galling on the crank. Check your oil pressure with a mechanical gauge, and a mechanical temp gauge if you can. Just to make sure -

Regards, and good luck -

Thank you for your response.  I had the current radiator recored and a new thermostat put in 14 years ago.  The coolant looks fine, the correct color green and no foam.  The oil is very clean.  I have noticed no hose collapsing.  I have the coolant replaced every 2 years.  I'll have the shop were I usually take my Z check the radiator functioning, etc.  Sure hope it is no spun bearing or any internal engine problem. 
17  Camaro Research Group Discussion / Maintenance / Re: Running Hot? on: July 29, 2014, 03:45:47 PM
Well I was finally able to do some checking on the underhood temps.  I drove the Z for between 2-3 miles to get the engine up to temp.  The outside air temp was in the mid 80's.  While driving the temp gauge stayed right around the first quarter marking, maybe one mark up toward the half marking.  While idling in my driveway the gauge read right at the one half marking.  The engine would not hold a steady idle but slowly had the idle decrease until the engine died.  This happened 3-4 times.  While the engine was not running the temp gauge would increase until it was between the one half marking and the three quarter marking.  This I take to be normal due to heat soak. 
Here are the temps I recorded with an infrared gun: 

radiator hose at thermostat- 183, bottom radiator hose- 164
exhaust manifold left hand side (driver's) from front to back- 364, 455, 417
exhaust manifold right hand (passenger) side again from front to back- 433, 570, 562
intake manifold at the high rise part on driver's side- 227
radiator across top- 145
radiator across bottom- 99
valve cover driver's side- 164
valve cover passenger side- 194
driver's side head-194, right at the temp sensor was 179
passenger side head- 253

I wasn't able to get accurate readings anywhere else or didn't think of trying anywhere else.  Definitely the right hand side (passenger) of the engine is a lot hotter than the driver's side.  I wasn't able to check other things while taking these temp readings as the engine was too hot to touch.  Any ideas out there?  Thanks again guys for all your help and opinions.  Just to add a side note:  the engine used to be able to idle for extended periods right at 900-1,000 rpm, with the temp gauge reading not much higher than the one quarter marking and without dying.  It also would restart while warm or hot with no problem. 
18  Camaro Research Group Discussion / Maintenance / Re: Running Hot? on: July 21, 2014, 12:24:26 PM
Thanks guys for all your ideas and responses.  I do have an infrared gun so will start from there trying to narrow things down as I go.  You guys have given me some things to look at that I never thought of.  Thanks JohnZ for the article; it was very informative.  It might take awhile for me to check everything but will let you guys know what I find out. 

I did want to ask one more question.  Will blocking off the heat passages in the intake manifold still make a difference even with my car not having a flapper anymore in the heat riser valve? 

I guess what got me the most perplexed was that with all this (in my opinion anyway) excessive heat build-up and hard starting if the engine stalled, the temp gauge still showed well within the normal range. 
19  Camaro Research Group Discussion / Maintenance / Running Hot? on: July 19, 2014, 06:10:04 PM
I wanted to post this info to get some helpful feedback and perhaps new ideas, and just to put my mind at ease.  My 1969 Z/28 seems to me anyway to be running hot even though the temp gauge shows well within the standards, reading barely over the first quarter of the gauge when driving and only going to the halfway point after shutting the engine off when I am guessing heat soak comes into play.  Sometimes when I pull away from a stop after driving for a half hour the car bucks, backfires, and then stalls.  I can't get it restarted for about 15 minutes until it cools down.  When I open the hood it is like I can feel a blast of hot air.  Previously the heat riser valve was stuck closed, but I had the flapper taken out.  Wouldn't this mean that no more hot exhaust gases are being circulated up to the intake manifold anymore to warm the carb at start-up?  When starting the car cold it does take longer to warm up now. 
Is it correct that the sensor for the temp gauge is in the engine block?  Is it possible the heads and intake manifold are getting hot for some reason even though the gauge reads fine?  Could there be gunk blocking a coolant passage in the engine, fan clutch not working,  smog pump or AIR system not working properly, etc.? 
About 2 weeks ago I drove it only about 2 miles at no more than 35-40 mph.  When I got to my driveway and turned the engine off and opened the hood I could see heat waves coming up from the passenger side exhaust manifold.  It was a hot day, in the low to mid 90's.  None of my other cars, or truck, put out anywhere near the heat that my '69 Z does.  And yet the temp gauge still reads fine; could the temp gauge be inaccurate?  My own thought is that I am boiling the fuel in the carburetor even with a heat shield, and that is why it wants to stall or kill and is so hard to restart until it cools down.  Am I overreacting or misinterpreting something?  Thanks guys for any and all help and ideas. 
20  Camaro Research Group Discussion / General Discussion / Re: Question about original dealer license plate frames on: July 19, 2014, 04:37:36 PM
Based on photos the original owner sent me of my '69 Z, both the front and rear license plate frames had the dealer name and Chevrolet inside the bowtie logo on the top and location of the dealership on the bottom.  It was originally sold from Gledhill Chevrolet in Wilmington, CA.     
21  Camaro Research Group Discussion / General Discussion / Re: Grill emblem placement for a 1969 Z/28 RS vs Standard on: June 30, 2014, 01:19:19 PM
Thank you Darrell.  Much appreciated.
22  Camaro Research Group Discussion / General Discussion / Re: Grill emblem placement for a 1969 Z/28 RS vs Standard on: June 30, 2014, 11:53:41 AM
Arrrgghhh.  It says that my photo is too large to post.  Sorry guys.  I'm not that computer literate to know what to do now. 
23  Camaro Research Group Discussion / General Discussion / Re: Grill emblem placement for a 1969 Z/28 RS vs Standard on: June 30, 2014, 11:50:16 AM
Here is a picture of a photo the original owner of my '69 Z/28 RS sent me a few years ago.  It is a 01C car, was sold in Feb., 1969, and the photo was taken in Apr., 1969.  I can't imagine the grill emblem being moved from where the factory installed it with the car only being 3 months old from assembly date and 2 months old since being purchased new.  It looks a little high in the grill to me rather than being centered from top to bottom.  I'm just thinking that with the emblem being installed on the assembly line by humans, with no pre-drilled holes like sheet metal would have, the grill emblem might have been installed in a "general area" on the driver's side of the grill, on RS cars anyway. 
24  Camaro Research Group Discussion / General Discussion / Re: Well My Camaro online Compadres, Time for a fight of my Life! on: March 03, 2014, 11:01:46 PM
I'll be praying for you, Danny.  Hope you have a complete recovery. 
25  Camaro Research Group Discussion / General Discussion / Re: 4053 DZ carburator on: February 07, 2014, 06:23:04 PM
I read in an article in a car magazine or book that Holley rated the 4053 at 780 cfm and GM rated it at 800 cfm.  It didn't go into any further detail why each company rated the same carb differently. 
26  Camaro Research Group Discussion / General Discussion / Re: How long are you guys running your radials tires on: January 31, 2014, 06:44:15 PM
I have been trying to find Goodyear Eagle ST's or GTII's (with raised white letters) to put on my Z but have been told Goodyear no longer makes them, or any raised white- lettered tire for cars.  Neither does Firestone.  Kelsey has reproduction Goodyear Steelgards (white-lettered) and I think Goodyear Eagle GT's with outlined white letters.  The Goodyear Steelgards very likely came on your '78 Z28 as original tires as they did on my '78 Z28.  The only tire I can find as a new radial tire with raised white letters is the Cooper Cobra Radial GT, other than of course the BFG Radial TA's.  Hope this helps.       
I drive my cars a lot. To work, 10 miles from home, to meetings and on the interstate. I better change these tires out. I have always run BF Goodrich Radial TA's but would like to check out others. I was thinking about Good Year Eagle STs. I had them on my 78 Z28 in high school. Does anyone have any other suggestions? All ears.


27  Camaro Research Group Discussion / General Discussion / Re: Storing Tires on: November 25, 2013, 07:42:40 PM
Thanks for the info, guys. 
28  Camaro Research Group Discussion / General Discussion / Storing Tires on: November 19, 2013, 11:59:53 PM
What is the preferred or best way to store a set of  tires?  I plan on keeping a set of reproduction Goodyear bias ply tires in my cellar where they will not be exposed to any sunlight.  The cellar is also ventilated and not a lot of moisture accumulates even in the winter.  Is it best to store them upright not touching each other like they commonly do in tire stores?  Should they be rotated every so often?  Is it better to store them mounted on wheels than not mounted?  And if so, how is the best way to store the wheel-tire combination?  Stacked, upright, etc.?  Thank you.   
29  Camaro Research Group Discussion / Originality / Re: GM silver for Rally wheels. on: November 01, 2013, 07:28:48 PM
Thanks for the input.
30  Camaro Research Group Discussion / Originality / Re: GM silver for Rally wheels. on: November 01, 2013, 12:54:47 PM
To the best of my recollection I paid around $400 to have a set of 4 rally wheels sand blasted and powder coated. 
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