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#21
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Quote:
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1966 Pontiac GTO (restoration thread) 1998 BMW 328is (track rat) 2023 Subaru Crosstrek Limited (daily) View my photos: Caught in the Wild |
#22
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Well so far( 25K miles or so) it's done the job and the motor is running cooler and in reaction to that the fan does not come on as much at stop lights and at idle.
I have no problem with the metalic powder I used and have used it many times before, in fact In new cars on the line GM put 2 tablets of the stuff in every car's cooling system as a precaution! It's the ciramic type liquid head gasket sealers that can clog up a cooling system darn fast if you have not fully flushed it out first. Oh, and by the way my Sabaru's had 175K on it be fore the issue started and it was due to a slight but short overhead session from a pin hole leak in the middle of the lower hose.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#23
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Cometic gaskets require a very smooth finish to the deck and head. (RA 50 or better. If you do not have it you can get head gasket leaks from them. I have seen this.
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#24
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The block & heads were prepped around 20 years ago when Felpro & copper gaskets were the only gaskets around.
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No! Do not try! Do! Or do not. There is no try. - Yoda 1967 Firebird Restoration 2005 - 1/25/2017 |
#25
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You might get away with different gaskets, but I would check the heads and cylinder walls while it is apart
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#26
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Gonna jump on the head gasket/cracked head bandwagon.
Had nearly those exact symptoms with my '73 'bird when a head gasket blew. No steam clouds out the exhaust or milky oil, just all the coolant would disappear after driving it.
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---------------------------- '72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car! '73 Firebird 350/4-speed Black on Black, mix & match. |
#27
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***UPDATE***
I finally got around to pulling the heads off and it looks like compression may have been sneaking past the Cometics between the cylinders. I rotated the crank and also discovered that #5 cylinder has a small crack in it so it's time to 'throw it in the gutter & go find another.' Now I'm waiting on my machinist to finish up a '67 block with splayed caps so I can start a new build.
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No! Do not try! Do! Or do not. There is no try. - Yoda 1967 Firebird Restoration 2005 - 1/25/2017 |
#28
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Who does your machine work?
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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. |
#29
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Yes, pull the plugs. The cylinder(s) with the leaks will squeeky clean. You should have a trail of white smoke out of the exhaust too. If it leaks compression , it generally leaks under vacuum too and sucks coolant into the cylinder.
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Triple Black 1971 GTO |
#30
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Use hylomar M for sealant.
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Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
#31
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Just an additional note, make sure gasket bore size is not smaller than combustion chamber!
Common error when selecting Cometics. Cataloging references bore size 😬. |
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