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Old June 7th, 2008, 07:13 PM   #1
muddin_wolverine
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Default blowing seals, alot of them

ive got a 383 ina 70s block with a performer high rise intake with high press/vol oil pump and i keep blowing the front and rear intake gaskets out, like completely hanging out out. how do i fix this? are there rubber on metal ones i can buy somewere? i cant seem to find anywere that sells individual high performance gaskets. and i dont wanna buy a whole kit for 2-300$. ive tried rtv on paper and rtv on rubber, even the ones with the little tabs that stick into the holes in the block. ive changed them 4 times
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Old June 7th, 2008, 07:17 PM   #2
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Sounds like you have another issue. Was the block decked or the heads milled, if so how much?
Also are you having any other issues with oil consumption, blow-by, oil leaks elsewhere, etc?
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Old June 7th, 2008, 07:23 PM   #3
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decked the block to flat, ended up being .02 off the top and sides, heads are flat, intake is square. i made sure nothing was warped and such after the 2nd seal blew out, and i use a torque wrench :) its the only problem im having, everything else is peachy
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Old June 7th, 2008, 10:53 PM   #4
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Throw the end seals away. Just use a bead of ultra black or ultra grey rtv. Let it fully set up before you fire it up. The better gasket sets don't even come with the end seals anymore...
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Old June 7th, 2008, 11:00 PM   #5
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ill try that and see how it works
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Old June 7th, 2008, 11:22 PM   #6
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Throw the end seals away. Just use a bead of ultra black or ultra grey rtv. Let it fully set up before you fire it up. The better gasket sets don't even come with the end seals anymore...
x2. i never use end seals as no matter what you do they leak or blow out. RTV is a dead cure for your problem. if you blow out RTV then you have some serious crankcase pressure building up.
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Old June 8th, 2008, 12:14 AM   #7
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Yep, lay a bead just taller than what the gap would be on top of the end rails. Let it 'skin' and smear a little on the intake side to stick to. Then drop it on. Letting is set up just a little before plopping the intake on prevents it from spooging all over and then into your valley.

Also like they said, make sure you have enough crankcase ventilation. If you're developing pressure there you need to vent it. A high horse engine will need more venting than stock, depending on a lot of other factors.
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Old June 8th, 2008, 11:36 PM   #8
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sound like they got you on the right track throw out the gaskets and use rtv instead
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Old June 9th, 2008, 12:21 PM   #9
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The title of this thread is extremely misleading.
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Old June 9th, 2008, 07:49 PM   #10
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The title of this thread is extremely misleading.
"I swear - it's just ice cream!"
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Old June 9th, 2008, 09:39 PM   #11
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"I swear - it's just ice cream!"
lolz
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Old August 14th, 2008, 12:35 PM   #12
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The "great stuff" sealer is awesome, a little more expensive but its the best stuff I have ever used
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Old August 22nd, 2008, 10:21 AM   #13
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The "great stuff" sealer is awesome, a little more expensive but its the best stuff I have ever used

It is called THE RIGHT STUFF it is made by permatex. It is all I use anymore especially when working on rear axles and intake end seals. It is about $18.00 for a can of it but it is worth the money.
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Old August 22nd, 2008, 10:44 AM   #14
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Originally Posted by merr6267 View Post
Yep, lay a bead just taller than what the gap would be on top of the end rails. Let it 'skin' and smear a little on the intake side to stick to. Then drop it on. Letting is set up just a little before plopping the intake on prevents it from spooging all over and then into your valley.

Also like they said, make sure you have enough crankcase ventilation. If you're developing pressure there you need to vent it. A high horse engine will need more venting than stock, depending on a lot of other factors.


X2 , I added exhaust evacts to my 406ci. that helped alot.
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Old August 22nd, 2008, 04:59 PM   #15
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It is called THE RIGHT STUFF it is made by permatex. It is all I use anymore especially when working on rear axles and intake end seals. It is about $18.00 for a can of it but it is worth the money.
agreed best sealer ive used so far.
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Old August 25th, 2008, 06:12 PM   #16
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you should be fine with seals, but if you're blowing them out that fast, you're building up pressure in the crankcase. either you don't have a PCV and breather, or you hooked it to ported vacuum.
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