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#1
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I've had the bird in hibernation for over a month. I looked at the "catch-pan" underneath and there is antifreeze on it (a pretty good amount). I never had any overheating issues and the antifreeze is very clean. This is a fresh build and the location of the puddle is the p-side toward the back of the engine. I have to move various items to jack the car up- any idea what could be leaking? Will a head gasket do this?
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded) '69 LeMans Vert, 350, #47 heads: Non-running project |
#2
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I would check the heater hose on top of the passenger rear head and the heater core first
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#3
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Thanks, I'll check that. I failed to mention that I bypassed the heater core, the hose run from the water pump, into the head. I certainly hope it isn't the freeze plug on the back of the p-side head.
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded) '69 LeMans Vert, 350, #47 heads: Non-running project |
#4
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Sounds like the freeze plug at the back of the head.. Hate to say that, but that's what I had on one head.
I cute out a piece of metal filled the freeze plug area with The Right Stuff and installed the metal cap over the plug.. till the day I pull the engine and fix it properly. There are bolt holes on each side of the freeze plug that I used to secure my metal plate.. Had my son make me a 3/16" steel plate with the holes drilled so it secured to the head.. No more leaky.. Charles
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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick. Best so far 10.12@133 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
#5
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded) '69 LeMans Vert, 350, #47 heads: Non-running project |
#6
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I wouldn't remove the head just to repair the frost plug. The coolant stop leak might work also as was mentioned.. I'm not a fan of the product.. I can draw you a pic of what I did if your interested.. If you do happen to remove the head to change the plug, make dam sure there are no pits or damage to the frost plug hole. I used a bit of JB weld to smooth out the frost plug hole. When installing the new frost plug make sure to coat plug and hole with Loctite gasket sealant. Charles
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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick. Best so far 10.12@133 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
#7
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded) '69 LeMans Vert, 350, #47 heads: Non-running project |
#8
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how you eliminate that is by replacing them at rebuild time. its senseless to save 8 bucks on a rebuild by forgoing freeze plug replacement. you can never tell a thing about freeze plug condition from looking at the outside of them. However you can be certain simply by replacing them. it at least eliminates the freez plugs from the troubleshooting/fear variables list
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#9
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Where did you get the impression that the freeze plugs weren't replacced? All of the machine work on my block and heads was performed by a machine shop and they installed new brass freeze plugs throughout. Apparantly mere replacement isn't a guarantee that they won't leak.
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded) '69 LeMans Vert, 350, #47 heads: Non-running project |
#10
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I throw in a can of coolant stop leak sealer in every rebuild. I've heard gm put a can of stop leak in each new engine as insurance, don't know if thats true.
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#11
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Check the torque on the intake and the head bolts if you don`t find a leaking freeze plug or hose. The cold weather can do tricks on metal expansion. A lot of cold engines will leak, but stop when warm as the components warm and expand.
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#12
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This build has less than 300 miles on it, will it still work if it ends up being a freeze plug. Does stop leak have any negative effects on the radiator (aluminum)?
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded) '69 LeMans Vert, 350, #47 heads: Non-running project |
#13
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You might check the rear head bolt as well. If you didn't use a sealer on it, might be seeping.
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Kenny Cincinnati, Oh 1971 Ventura II 400 .060 Eagle Rods |
#14
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I didn't use sealer on any head bolts, I didn't know I had to. Which head bolt are you referring to and will this apply to both heads?
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded) '69 LeMans Vert, 350, #47 heads: Non-running project |
#15
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Stewart
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1976 TA, nose converted to 1970 style, 406, ported #13 Heads, '70 iron intake without crossovers, Q-Jet - Cliff style, RARE OS manifolds, Pypes duals w/crossflow, UD 230/238 custom HR 4/7 swap cam with solid roller lifters ![]() “Nothing in life is so exhilarating as to be shot at without result.” - Winston Churchill |
#16
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I beg to differ, pull the passenger side headbolt out and see if it doesn't leak water. has on 2 different 400 i've built. If you don't use sealer it will seep water sometimes from under the head of the bolt.
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Kenny Cincinnati, Oh 1971 Ventura II 400 .060 Eagle Rods |
#17
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![]() Quote:
Stewart
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1976 TA, nose converted to 1970 style, 406, ported #13 Heads, '70 iron intake without crossovers, Q-Jet - Cliff style, RARE OS manifolds, Pypes duals w/crossflow, UD 230/238 custom HR 4/7 swap cam with solid roller lifters ![]() “Nothing in life is so exhilarating as to be shot at without result.” - Winston Churchill |
#18
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Ya no sealer on head bolts.. All block holes are blind..
Charles
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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick. Best so far 10.12@133 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
#19
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If a machine shop built and assembled engine I would go back and ask them what they recommend, If a machine shop did the work and you assemblied I would try a can of stop leak. If that doesn't work use radiator pump pressurizer test tool to find where its leaking. Then go from there.
Stop leak will not harm alum radiator if used spearingly. I use it as an insurance program cause I don't do enough freeze plugs to be super good at it, and don't trust myself completely. Had to remove and replace a few of my freeze plugs. |
#20
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__________________
Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded) '69 LeMans Vert, 350, #47 heads: Non-running project |
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