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#21
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You can buy the lower hose spring from our host- as stated it needs to be in there to prevent hose collapse at cruise rpm. Install a sacrificial anode in place of the draincock to mitigate potential corrosion issues. https://www.amazon.com/Camco-11533-A...87688973&psc=1 You are getting many good tips hear that should resolve your issue.
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears '69 LeMans Vert, 350, #47 heads: Non-running project |
The Following User Says Thank You to grivera For This Useful Post: | ||
#22
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Make sure the coolant tubes (item 105), (P/N 9796347) where installed when engine was assembled.
https://lh3.googleusercontent.com/i6yxwBmu82FSfbdkZHx10_9xfW0nDEExTYAbi7UKP827U2cRTe b2g1yFdaLYtUusNVQnmg=s122 |
The Following User Says Thank You to Dynoking For This Useful Post: | ||
#23
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The OP has an 8 bolt pump, not the 11 bolt pump shown here with the water tubes.
Sent from my SM-G965U using Tapatalk
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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight |
The Following User Says Thank You to leeklm For This Useful Post: | ||
#24
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I removed that dual fan/shroud configuration and installed a new FlexALite fan setup and am going to see how things go soon as I get a minute.
I am really excited about this fan setup. My last resort will be the factory fan setup. More to come. |
#25
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Looks good in there. I do think that should help you out.
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-Jason 1969 Pontiac Firebird |
The Following User Says Thank You to JLMounce For This Useful Post: | ||
#26
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So just another opinion which I believe is what you are looking for. In addition to all the great posts
above, Your blue impeller on your water pump doesn’t look like most I’ve seen. Some of these aftermarket pump impellers are junk and I think you may have one. While I’ve only had a couple of 11 bolt water pumps on my 69 judge and my 68 455 firebird the pump impeller design is way different and I think more efficient at moving coolant. I’ll see if I can post a better designed impeller that moves more water. |
The Following User Says Thank You to judger69 For This Useful Post: | ||
#27
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The high flow Milodon pump I put on my 455 firebird has the same impeller as the middle one in these pics. I’m a big fan of these style impellers as it cured my overheating problem.
If your new fan and shroud don’t fix your heating problem then here is something else to try. |
The Following User Says Thank You to judger69 For This Useful Post: | ||
#28
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Clay |
#29
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I had the exact problem with a clients car that had an engine replacement. The mechanic who did the install tried everything to correct the overheating issue. Eventually the job was assigned to me. After careful inspection of everything that was done I asked “did you install the coolant passage tubes?” After a long blank stare he replied “what tubes “. A box of leftover parts was returned from the engine rebuilding shop and there was the tubes. I installed them, problem solved. In my many years of in the Pontiac hobby I have seen this scenario several times. I’m not insisting I’m right, but I strongly suggest that the installation of the tubes be verified. |
#30
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Nope. The water sleeves were not used in the 8 bolt pump. The 69 and up went to the 11 bolt pump that uses the sometimes missing sleeves.
I do not have any apple to apple comparisons, but some have said the 11 bolt configuration is more efficient vs the 8 bolt. Butler sells the full kit to upgrade from 8 bolt to an 11 bolt pump. Sent from my SM-G965U using Tapatalk
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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight |
#31
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#32
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I recently had to research this topic extensively while helping a friend with an 8 bolt pump. All of mine have been 11 bolt
Sent from my SM-G965U using Tapatalk
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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight |
#33
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Knowledge is power. That’s why I like this forum. Experienced Pontiac people sharing information. My story involved a ‘75 GP with a 400. The other instances were tech articles that I have read over the years. Never a mention of 8 bolt vs. 11 bolt pumps. Thanks for setting it straight.
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The Following User Says Thank You to Dynoking For This Useful Post: | ||
#34
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I have an update and now we can put a period at the end of this thread. My overheating problem is solved .
After installing the flexalite fan setup, and after letting the engine idle for a couple hours, and after driving around town for a while, my temp does not go over 190 unless I shut it down, then it quickly goes back down. It cycles nicely between about 180°-190° and stays in the 'green' on my gauge.. The fan is very powerful and very quiet. Thank you for all the great advice. I'm always learning more and more on here John |
The Following 2 Users Say Thank You to Hotrodjohn71 For This Useful Post: | ||
#35
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Great to hear John! I'm experiencing the same this with that Flex-A-Light Black Magic.
It's a good fan for a first gen.
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-Jason 1969 Pontiac Firebird |
The Following User Says Thank You to JLMounce For This Useful Post: | ||
#36
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Great to hear!
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
The Following User Says Thank You to 67drake For This Useful Post: | ||
#37
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Thanks for posting your results!
Sent from my SM-G965U using Tapatalk
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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight |
The Following User Says Thank You to leeklm For This Useful Post: | ||
#38
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__________________
Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears '69 LeMans Vert, 350, #47 heads: Non-running project |
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