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Old 05-08-2013, 11:45 PM
67MercCat's Avatar
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Chevy 350 Heads question

I have some Chevy 350 heads 333882 casting and I know that they're from an El Camino I checked out some info on them and they're 70-80 w/1.94/1.50 and
76cc. Do these heads need hardened seats for modern gas?
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Old 05-09-2013, 04:13 AM
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882 heads were one of the first factory attempts at hardened exhaust seats.

Many are cracked! Have yours professionally checked..
They usually start the crack under the center exhaust seat where the intake manifold heat crossover port enters the exhaust port. Too much concentrated heat in this area. Damage is also done during production in this area, concentrated heat from the hardening process that leads to later failure.
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Old 05-09-2013, 07:29 AM
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Yes, induction-hardened exhaust seats, '73-newer.

Be aware, there are two very different "882" castings. While the last three digits of the casting number are the same, the first four are not. The "good" one (defficient exhaust port, but pretty tough) we refer to as the "heavy" casting, has a very straight "edge" along the liine below the lower head bolts (one or two "notches"). The lighter version (the one that is NOTORIOUS for cracking) is "scalloped" between each cylinder along that lower line. NOTE: the "heavy" casting is also known to crack where stated, when engines are overheated. This is true with most small block factory castings.

Jim
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Old 05-09-2013, 08:57 AM
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thx guys. I had em rebuilt already and they checked out fine...I had some problems with cracked heads with the 462624 casting, horrible! so I junked em and bought these. These heads have two notches. I just didn't know if the heads needed seats or not. I know the El Camino was at the oldest at '78.

Check em out
http://i375.photobucket.com/albums/o...ps7ef92918.jpg
http://i375.photobucket.com/albums/o...ps9c62b283.jpg
http://i375.photobucket.com/albums/o...ps150498ac.jpg
http://i375.photobucket.com/albums/o...psf51c75da.jpg
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Old 05-09-2013, 12:14 PM
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"Heavy" castings. Same situation with the 624s, two different versions.

Jim
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Old 05-09-2013, 03:44 PM
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You know, I'm all about the "combination" of parts being used together to reach a common goal. I see that you have a Victor Jr. sitting there. If you plan to use it with those fosdick heads, you should know that your combination is all wrong. Here's the operating range for the Victor Jr. as posted on Edelbrock's site......

Chevrolet 262-400 Small-Block V8
VICTOR JR. (3500-8000 rpm)

So, if you run that intake, you will have heads that will make power from idle to 4500 and an intake that makes power from 3500 to 8000. Doesn't look like a match to me.
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