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Old 11-08-2002, 08:42 PM
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Post Chevy smog heads/what the ...

I was putzing around today started cleaning an old set of chevy 882 casting smoggers(bored on my ***).Any way I noticed carbon under the heat cross over riser on the lifter galley side.The more I chipped off the more I noticed there are two passages from the inner 2 exhuast ports that blow exhuast into the lifter valley.I never noticed that befor.What the hell would they want exhuast heat inside the crankcase for???

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Old 11-08-2002, 11:01 PM
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The heat riser passages from the heads don`t exit into the lifter valley, they exit into the intake manifold which has the same passage, it was used to provide heat to the carb for quicker starting in cold weather, and was also used for chokes on some early models. it`s also suppose to help end puddling of fuel on the floor of the intake. take a intake and look at it, the passage runs underneth the carb pad.
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Old 11-09-2002, 09:48 PM
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Doublevision I know what your sayin bout the heat riser passages for the carb,but that ain't what I'm talkin.
On the 882s there are passages that exit into the lifter valley.I had never seen that befor.I checked my 993s and a set of 461s and neither have these weird ports.These holes are right under were the pushrods go through.Weirdest thing I ever seen.I showed someone else and they almost s..t.
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Old 11-10-2002, 04:00 AM
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Somethings wrong because GM never put anything like that on any head, look at it again. If something from the exhaust port goes into the lifter valley you might as well throw those 882's in the garbage.
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Old 11-10-2002, 09:14 AM
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There diffinetly are two ports leading into there.Allthough these heads were a frebie so maybe now I know why.I definetly don't plan on using them like that(well except for weight in the winter).

If I had a digital camera and all that stuff I'd post a picture.
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Old 11-10-2002, 09:41 AM
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you know its funny , ive seen this before and had this exact same discusion with a friend as to why they did this, i still dont know why but am curious.
i could not figure out why they would want to dump exhaust into the lifter valley, it makes no sense.
or maybe they are suposed to be plugged and the stops have eroded?
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Old 11-10-2002, 09:57 AM
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See guys I'm not alone.
Trans were they 882 by any chance??
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Old 11-10-2002, 01:04 PM
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The best thing for 882 castings is in the garbage regardless, a light cast head with double heat riser passages, I`ve seen them get real gummed up in that area but never chipped away the gum to see if it had erroded through the casting, even so that maybe why they were erroded there. I have 2 sets of these heads, both cracked, i`m gonna strip of parts and throw`em away. Much as I`ve read up on 882 castings over the years, all say the same thing "prone to cracking" and every set I`ve gotten was cracked, makes me happy I never paid for any of them.
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Old 11-10-2002, 06:45 PM
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I'll agree they are POS.Last car of mine they were in was my dodge truck for weight in the winter.The only reason I am evan saving them is I want to learn how to port and don't wan't to screw up a good set of heads.I looked closer and think it may be a crack in the top of the heat riser making carbon come out were they scalloped metal away(I'm assuming this area is what makes um light castings).
Either way they'll probably see a diegrinder befor the dumpster.
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Old 11-10-2002, 06:52 PM
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Yeah, I agree that 882's are garbage. So are the 624 heads. I actually got a 350 SB that had mismatched heads. A 882 and a 624....Go figure! Anyway, I am putting a pair of 487X heads on my 350 instead. I'll have to look at the 882 head for the holes you're talking about, to see if it has them.
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