I did not have that issue.
Thermostat Gasket
- Thread starter CRUZE 418
- Start date
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I have great luck with Real Gasket thermostat gaskets... The valve cover gaskets, not so much. I also found that thermostat housings (Dorman?) from NAPA come in Cast iron instead of aluminum much less likely to warp and a brand new machined surface - worth the cost.
Real Gasket worked for me 3 years ago, but when I went to a Flowkooler water pump, it blew the gasket out 2 times in a row. I then changed to a Flashpower o-ringed thermostat housing, no leaks or blowouts since.
Fishing68
Well-Known Member
Maybe my thermostat housing has a cavity for the thermostat that is is larger than it needs to be… thought it was an aftermarket one that was true to the original specs/sizes.
Fishing68
Well-Known Member
Thanks for the replies. I am thinking I am going to just run it as is. Engine run temps are good and I have seen some people even drill a small hole in the thermostat for other reasons without adverse effects
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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What I discovered years ago was that after flatening the surfaces, the relief in the alloy stat house was not deep enough to receive the stat, and the stat would keep the two flat surfaces apart. It worked fine for awhile, but eventually would blow out, as the housing eventually warped downwards around it.
The cure was to flatten it again and cut the stat-cavity deeper. After I learned that, I prepped a few spares, but never needed them.
FYI,
Another thing I eventually did, after I had a solid-working system, is I installed a 7 pound cap. My hoses are now, all of them over 20 years old, some are 24yo and AFAIK the lower intake hose is an early 1970s model. IIRC the newest hose is the bypass hose, installed in around 2002.
The cure was to flatten it again and cut the stat-cavity deeper. After I learned that, I prepped a few spares, but never needed them.
FYI,
Another thing I eventually did, after I had a solid-working system, is I installed a 7 pound cap. My hoses are now, all of them over 20 years old, some are 24yo and AFAIK the lower intake hose is an early 1970s model. IIRC the newest hose is the bypass hose, installed in around 2002.
famous bob
mopar misfit
Bet ur like me and always overtightened the dam things and distorted the housing /causing it to leak ...
I tried tightening it down from light to too much, didn't matter. Sanded housing flat, filed the intake, never had these issues that I remember from working at a garage for awhile in the late 60's, early 70's. The o-ringed housing is the fix, I have never had to mess with the damn thing since. Torqued in inch lbs, don't remember how much, not out in the garage.
Same here but with the Real Gasket. I did not do much to the manifold but block of wood with sand paper on it and a new repo cast Al t-stat housing. Installed it dry and 25 inch lbs or what ever it is. and not a drop since 2017 and 16 lb cap.
Something I also did was to be sure there was nothing in the T-Stat mounting holes and that the bolts can bottom on the housing without a gasket before they bottom in the hole. I suspect several leaking T-stat housings, that is the #1 issue, tightening against the bottom of the hole not the housing.
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