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GM 33882 Heads 1.94/1.50 76cc

  
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GM 33882 Heads 1.94/1.50 76cc

 
bigdee2 bigdee2
User | Posts: 54 | Joined: 12/10
Posted: 01/29/13
01:11 PM

I have a few sets of these cylinder heads, which I'm told are absolute garbage.  Yet, when I post them on auction sites, people go crazy over these things - what I'm I missing?  I heard 305 owners really like these for an upgrade?  

tuffnuff tuffnuff
Moderator | Posts: 7828 | Joined: 12/09
Posted: 01/29/13
01:19 PM

Read my post on Cylider Head ID.,. 882's are the best of the worst that Chevy produced.
the chambers are 76cc and it's generally agreed that these heads make good door stops.
882's on a 305 would net almost zilch for compression.

Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 01/29/13
01:25 PM

http://forums.chevyhiperformance.com/70/9357265/general-discussion/small-block-head-id/

This thread calls them the best of the worst. I've heard that from other sources too.

http://www.purplesagetradingpost.com/sumner/techinfo/heads1.html#GM%20882

This site has a list of factory and various aftermarket heads with their flow numbers. The site names its source(s) of information.

It just depends on what your end goal is as to what any head is worth in performance or dollars.  
68scott385 68scott385 68scott385

pepsi1 pepsi1
Guru | Posts: 1718 | Joined: 09/11
Posted: 01/29/13
01:43 PM

+++++ Tuff what was that you said awhile ago.
The 882's are junk. From 1974 to 1980 GM had to get the emissions down. If you even compare them to an early (Gen1). You will see how much material was taken away from the spring side of the head itself.

Note the high pedistal the rocker arm is on. Any high RPM will pull those rocker arm studs up. Thats one thing. But I wouldn't use them on anything....

Bob  

Pontiacman2 Pontiacman2
Moderator | Posts: 8956 | Joined: 09/08
Posted: 01/29/13
02:03 PM

Ya using those on a 305 would get you some where around 6-7.5:1SCR.

People probably go crazy over them because they don't really know what they are buying or know any better.  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

bigdee2 bigdee2
User | Posts: 54 | Joined: 12/10
Posted: 01/30/13
07:10 AM

Would these be used on a small block 400 to make it a stroker 377?  Any advantage to that?  

redneckjoe69 redneckjoe69
Addict | Posts: 2337 | Joined: 03/10
Posted: 01/30/13
08:07 AM

no and no.

 stroking is done by changing the crankshaft/stroke.

 no advantage to 882s on a 400.  

pepsi1 pepsi1
Guru | Posts: 1718 | Joined: 09/11
Posted: 01/30/13
08:13 AM

Pontiacman.

They look big because GM took so much material from the casting.

The only thing I can say if your going to spin your small block over 5500RPM, then pin the rocker arm studs. They pull out because there is nothing to hold them. As I said they took a lot of material from the heads.
  If you look inside the intake port you may see where the stud went thru the roof . They crack..

Bob  

redneckjoe69 redneckjoe69
Addict | Posts: 2337 | Joined: 03/10
Posted: 01/30/13
08:24 AM

Bob, i had a stud pull loose on a set of 882s years ago just like you said.   the pushrod ended up splitting a stamped steel, rockerarm in half!  Shocked  

tuffnuff tuffnuff
Moderator | Posts: 7828 | Joined: 12/09
Posted: 01/30/13
08:37 AM

"ALL" power that an engine produces, is generated in the combustion chamber of the head.,. that is an undisputeable fact.
It's highly unlikely that a junk head will ever be transformed into a performer.,. even if you do everything known to man and God to it.
882's are junk, plain and simple.
There are better heads out there.

Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

pepsi1 pepsi1
Guru | Posts: 1718 | Joined: 09/11
Posted: 01/30/13
01:05 PM

+1 Tuff
+1 Joe

Noone cares to listen anymore!

Bob  

pepsi1 pepsi1
Guru | Posts: 1718 | Joined: 09/11
Posted: 01/30/13
01:42 PM

When I was doing consulting work for a Chevy Dealer. A State Police Cruiser came in on a hook. It had a engine miss. It was a 1994 LT1. They give this to one of their master techs.

I was only there to observe and advise.

He pulls the valve cover off, what a mess metal shavings all over the valve train. Long story short. (2) Bent push rods on cylinder #2. The next morning I came in the Cruiser is gone. The tech put 2 push rods in it sent it out the door. I said what. The Police had already picked it up.

2 days later in comes the cruiser. The engine is locked up. A week later they get the okay to pull the engine from GMPP. The pan was loaded with metal. You know where it started? A stud pulled up, all the flexing the valve train does it then cracked the stud boss, I'm sure we've all seen the way  State Police cruisers get tortured. Well I'm not going to beat this to death anymore.

There was one other point to this story also. Why didn't they just pull the engine and replace it. The Master tech wanted to get paid for it twice.

Bob  

Pontiacman2 Pontiacman2
Moderator | Posts: 8956 | Joined: 09/08
Posted: 01/30/13
01:54 PM

Icon Quotepepsi1:
Pontiacman.

They look big because the took so much material from the casting.

The only thing I can say if your going to spin your small block over 5500RPM, then pin the rocker arm studs. They pull out because there is nothing to hold them. As I said they took a lot of material from the heads.
  If you look inside the intake port you may see where the stud went thru the roof . They crack..

Bob


Yes they are lite weight castings.
They also have small intake runners and are smaller then some  runners on 305 heads.
They are also crack prone.  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

chrishd2008 chrishd2008
New User | Posts: 2 | Joined: 01/13
Posted: 01/31/13
06:09 PM

well i have a question i have a 350  bored 30 and i put 305 tpi heads and tpi on top of it with  stock cam what would my compression ratio be? i believe they r 58 cc heads they are off of a stock 305tpi i need to figure this out to get a chip burned with what im guessing only based on what i can find on the internet is that im at a 11:1? but i dont know if that is possible the pistons are flat top with 4 valve reliefs on each i think they are silvolite or something i honestly dont remember but i got it together and running  and now have to get a chip burned  the 305 is out of a 1985 camaro im staying with the tpi with bbk throttle body and slp runners  and i personally gasket matched every thing this has beed a work in progress for 3 yrs sorry but any thing you could think of i would apprecieate is what im doing not a good idea? premium fuel?  

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 01/31/13
07:00 PM

try this to help you figure your CR, many variables go into the calculation

http://www.kb-silvolite.com/calc.php?action=comp  
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