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Old 04-26-2011, 04:37 AM
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China wall too high?

Put my afr's on and dry fitted my intake on and the base of the manafold was sitting on the china walls of the block, causing the intake-head gap to be too big I did some fiddling and if I stack 2 intake gaskets on each side I will be ok, but will this be ok to do? Its for a sbc, I assume decked .010 off the top because the pistons are -.015 in the hole and the manifold used is a accel hi-flo for a llingenfelter tpi. If I do go this route I will be using that gaskasnich stuff to hold it all in place. I just dont want to take it all part to fix this if I dont need to. Its for a daily driver corvette n/a engine no blower or nos

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Old 04-26-2011, 05:51 AM
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With the two gaskets how do the roof and floor of the ports match up? If the match is good then going with a single 1/8 thick intake gasket like Mr Gasket #116 or FelPro 1266 or 1267 might be the trick. If the intake port of the manifold is too high then I would look to have the base of the intake machined to gain the needed clearance which is something I've had to do in the past and is quite easy on a Bridgeport miller.
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Old 04-26-2011, 07:50 AM
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I've never heard the term "China wall", can you enlighten me?
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Old 04-26-2011, 08:20 AM
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I'm assuming he means the front and rear lifter valley walls.
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Old 04-26-2011, 08:24 AM
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The front and rear ends of the block that tie into the deck surfaces. It's shaped kind of like the Great wall of China.
I never heard it before either. Probably wouldn't have clicked on this thread but I had to know what a china wall as too.
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Old 04-26-2011, 01:39 PM
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If you're saying that you have metal to metal contact without end seals being in place, I would look into either machining the intake mating surface as engineczar indicated or cutting the china walls. I never use the black rubber seals that come with rebuild kits, opting instead for a bead of silicone to seal the ends up. In your case, perhaps someone machined the block decks and didn't take the necessary cuts on the china walls to compensate for the heads being closer to the centerline of the main bearing bore.
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Old 04-26-2011, 01:40 PM
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Quote:
Originally Posted by engineczar
I'm assuming he means the front and rear lifter valley walls.
X2 that's what i have heard some people call them also.


Cole
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Old 04-26-2011, 02:21 PM
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I've always just called then the ends of the lifter valley....... We have "China" on enough crap already.
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Old 04-26-2011, 02:25 PM
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Quote:
Originally Posted by Hippie
I've always just called then the ends of the lifter valley....... We have "China" on enough crap already.
X2 same here.


Cole
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