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#1
04-09-2019, 07:10 PM
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Coolant leak at LH cyl head
Hi All,
I need a bit of advice please.  Recently I had the motor on my '73 350 Firebird overhauled. Crankshaft ground, bores honed, deck shaved, new camshaft, etc. A lot of work was done to the cylinder heads. Bigger valves, roller rockers etc. The engine work was done by an engine reconditioning shop and the motor was removed/installed by my mechanic. Before I was given the car back, it developed a coolant leak at the left hand cylinder head inbetween the spark plugs (as per the pics.) Sorry the 2nd pic is upside down, I couldn't fix it. Both the engine shop and my mechanic say they haven't seen this before so I am asking if anyone has any ideas why this has occurred. Any thoughts? |
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#2
04-10-2019, 07:09 PM
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Well I would say if it isn't coming from the bolt area it looks like paint peeling area and the heads cracked maybe ...???
Can u get a pressure tester and pressurize the system and inspect....????
__________________
 1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's
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#3
04-11-2019, 05:13 AM
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Looks like a pinhole leak. Try Rislone, expensive but very good. Repco, Supercheap, AutoBarn should have it.
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#4
04-11-2019, 06:17 PM
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Yes, we have tried Rislone Block Seal.
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#5
04-11-2019, 06:30 PM
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Give this a try,cheap.Im told all GM cars get thse put in from the git go.Tom
https://www.amazon.com/Genuine-GM-12...gateway&sr=8-1 |
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#6
04-15-2019, 04:50 AM
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Thanks for the info so far. I am driving it with a sealer in it to see if it will seal itself.
I'm not really optimistic though. |
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#7
04-17-2019, 01:29 PM
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This is what I use for instances like this.
I had a BBC rebuilt and had the oval port cylinder heads opened up to 2.19/1.88 valves. While cutting one of the exhaust seats got into the water jacket. The cure once the engine was finished was to run a bottle of this stuff through the cooling system. Ran that engine for about 7-8 years when one day white smoke started coming out of one exhaust pipe. I knew exactly what it was. Drove it home, put another bottle of this stuff in and it was fine again for a number of years. Ran the snot out of that engine too. https://www.jegs.com/i/Moroso/710/35...hoCwxcQAvD_BwE |
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