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#1
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Heater core inlet ?
What heater hose connection brings water to the heater core on a pontiac 400 ? The one off the timing chain cover or the passenger head ?
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1969 firebird 400 1962 lemans conv. 1958 cheiftian 2drhrdtp 1977 corvette (the wifes) |
#2
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The cylinder head connection is the outlet to the core, and coolant returns to the water pump.
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Lee Peterson ------------- "I didn't expect a kind of Spanish Inquisition...!" '69 Cameo White RA III Judge, 4 speed, owned since 1977 -- my first car. |
#3
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thank you
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1969 firebird 400 1962 lemans conv. 1958 cheiftian 2drhrdtp 1977 corvette (the wifes) |
#4
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If you are doing heater hose work on your pontiac, do yourself a favor and either bend the edge of the inlet tube to the heater core so that it has a small small 1/4" square hole for the water to pass thru. (Inlet Hose will go from the passenger head to this nipple).
What this does is restrict the tube enough so that when you accelerate hard you do not damage the heater core with the "slug of water" that the water pump creates when the engine accelerates quickly. That "slug of water" can easily damage a heater core over time if you like to go to WOT very often with your pontiac. Another member uses a small plastic restrictor with a 1/4" hole drilled in it to restrict the flow. He makes the restrictor from a piece of plastic rod to the inlet hose inside diameter and drills a 1/4" hole thru the center of the plastic. The length only needs to be about 1/2"-3/4" long. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#5
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X2! I did both, bent the metal connection and put a restrictor in the line. I like WOT.
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Adam __________________ 1964 LeGTO 469, M21, 3.42 __________________ Sold: 1968 Pontiac LeMans Convertible See it go HERE |
#6
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NOTHING wrong with "Both"
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#7
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Jeez, I should turn up some HDP plugs that would fit into the core nipple with a lip the same as nipple OD and a 1/4" hole drilled in them. Slide it in, reattach hose. I could make a FORTUNE
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#8
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I think that you could buy a very similar plastic piece right from the Ford dealer, as some years ago, the Mustang "Cop Cars" were having heater core failures, a suggestion was made, and the 'Powers to be at Ford' started installing the restrictor plastic part in all of the "Cop Car" vehicles, be it Mustangs, Trucks, or other cars. No more issues.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#9
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Find a cheap chinese 1/4" socket that fits the hose and stick it in. Usually free from your scrap pile. The Ford piece is a overpriced $45 piece of plastic with a hole in it. I can imagine the engineering that went into that. ; )
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize. 1977 Trans Am W72 400, TH350, 3.23 T Top Everyone you will ever meet knows something you don't. Bill Nye. Last edited by TedRamAirII; 04-23-2016 at 01:49 PM. |
#10
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American engineers are more expensive...
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1971 Pontiac Trans Am Cameo White 1968 Firebird 400 coupe, Verdoro Green w/black vinyl top 1968 Firebird 400 convertible, Verdoro Green w/black top 1970 Buick Skylark Custom convertible(driver) Fire Red 1972 Buick GS 455 Stage 1 Royal Blue |
#11
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Quote:
If Ford (With all of their Engineering) figured the thing out for $10 then by the time it made it to the consumer you are pay $40.00 seems about right with the typical supplier network. I bought 10 RAM AIR IV camshafts from the OEM supplier one time $17.37 each. (actual piece cost) The dealer price book at the time was over $140.00 for the camshaft. I sold them for less than $70.00 and sold all of them in a weeks time. $700 minus $173.70 = $526.30 profit. The Pontiac buyers were very happy to get the parts. So the point is there is ALWAYS mark-up on parts vs what the piece actually cost to make. Be it a solid plastic rod with a 1/4" hole drilled thru it, a Home Depot deal, even the cheap chinese solcket but a 1/4" drive socket does not flow as much as a the same as a 1/4" drilled hole. I could make 50 parts from a stick of 5/8" diameter plastic rod for $10.00 The Ford "over-priced" comment and the "engineering comment" were expected Tom V
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#12
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Quote:
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize. 1977 Trans Am W72 400, TH350, 3.23 T Top Everyone you will ever meet knows something you don't. Bill Nye. |
#13
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I just remembered what I used for inside the hose. Went to home depot, found a piece of scrap galvanized pipe, they cut an end off for me and have it to be for free. I squared off the end and installed it.
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Adam __________________ 1964 LeGTO 469, M21, 3.42 __________________ Sold: 1968 Pontiac LeMans Convertible See it go HERE |
#14
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I think Dick Boneski was one of the first to do the plastic rod piece in the heater hose that was posted on the forum.
I always did the "crimp the inlet tube on the heater core to 1/4" square shape" after being told to do it by one of my uncle's Pontiac mechanics in the very early 70s. Ford blew out a bunch of heater cores (before the mod) when the cops first got the Mustang cop cars and liked the acceleration not knowing the slug of water was going to take the heater core out at some point and the vehicle out of service. Tom V. Dick B has posted he blew out more than one heater core before he figured the deal out. (just like me).
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#15
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Tom , it would seem that if you necked it down to a smaller opening right at the nipple you would be getting a spray similar to what you get at a car wash always hitting the back of the heater core when you accl. Instead of having a soft larger amount of water going through the core you would end up with a small very hard spray going into the core which seems like it would be harder on the core then the larger amount coming in the core at a slower & larger amount of spray. ?????
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#16
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Quote:
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Adam __________________ 1964 LeGTO 469, M21, 3.42 __________________ Sold: 1968 Pontiac LeMans Convertible See it go HERE |
#17
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It's about pressure, it increases @ the restriction, and drops after the restriction, due to decreased volume after it. Think of it as a surge protector, protecting the heater core.
Interesting, as I have noticed it on many replacements I have put in over the years and only recently learned why. |
#18
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I don't understand because it's going to act as a garden hose when you pinch the end it make the water come out harder which will put more pressure on the heater core case as it sprays harder on the case as it comes through the hose thus putting extra pressure on the case as it comes through it under more pressure , what am I missing ???
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#19
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Quote:
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#20
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See... I'll make CUSTOM plugs with an orifice to your spec ... with a counter sunk ramp to the hole to SMOOTH that flow and further dampen that pressure spike.
$60 in solid brass, $40 in HDP $39.00 if you order 1000 of them |
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