Exhaust manifold leak on 350

I got exhaust coming out between the manifold and the block. I've change the gaskets twice, and filed down the manifold a bit to make the surface even. I really don't know what else to do. :/ any ideas?

 

My buick doesn't have gaskets:beer. Make sure the manifold to head surface is flat/ straight. I heard the buicks didn't even use a gasket for factory manifolds.

 

Or check out Remflex exhaust gaskets, not cheap, >$30 but Ive heard nothing but good about them. Guaranteed to seal. They are about 1/8 think, and even after being compressed, they'll expand a certain percentage to be used again. They can take up to 3000 degrees which your Buick will never see.. hopefully:laugh:

 

If the remflex don't work, you may have to resurface the manifolds and heads to get a good seal. This requires removing the heads. If you do not fix the leaks, you wil burn the exhaust valves.

 

Had a leak last year. Removed exhaust manifold and had it machined flat. All better!

 

copper coat it next time you change them.

 

Well I guess ill go for the remflex gaskets. I just redid the head gaskets because I had a small coolant leak, and a new cam. so I really don't want to go through that again. And if the gaskets don't work, I have another weekend of fun. where do they sell these remflex gaskets at?

 

http://catalog.remflex.com/BUICK_Header_Exhaust_Manifold_Gasket_p/rf13-005.htm

 

Thanks. Hopefully these gaskets will fix my problem. ray:

 

i have found that felpro gaskets do a good job of sealing the manifold to the head. victor gaskets do not. remember to torque the manifold bolts in proper sequence.

 

I was using fel-pro. And they still didn't seal. and what is the torque sequence? The book I have doesn't show it.

 

Get all bolts hand started, then when torquing just start with the center bolts and work your way out.

Devon

 

thanks, just making sure that there wasn't a specific sequencing.

 

I never used gaskets with the stock manifolds...just put some high temp silicone on there and it should fill the voids.

 

So my uncle looked at the car, and he said it sounded like a compression leak. So i took off the the passenger side head where i felt the air pressure coming from and it turns out i had a blown head gasket. :rant: And i had just done both heads 3 weeks ago. So i took a straight edge and the block deck is flat, no uneven spots. So im gonna have the head resurfaced and hopefully get everything back together tomorrow afternoon after work.

 

actually there is a sequence in the shop manual, but basically centre out. i do not remember the torque setting but i use a 12 point 6" wrench to tighten the bolts.

 

ive never seen a head gasket blow like that after just 3 weeks! wonder what caused it?uzzled:

 

That's what I said... Idk what happened. But hopefully I don't have any more problems. This engine has been bad with blowing head gaskets around the coolant port in the front.