I just picked up some chevy cast "882" heads. I heard they were good. Are they? Do you have any info about them. They're going to replace "441" heads. Is this a wrong choice? They're going on a 350. Any help guys?

Dave

 

882's are smog heads
76cc combustion chamber
i believe they do have the larger intake valves though

 

actually i think the 882's have the smaller valves. you probaly will not notice any difference between the 882's and 441's

according to www.mortec.com they are both smog era heads with 76 cc chambers.

 

What do you mean by smog heads?
Should I worry about using them with emmisions tests?

Dave

 

If they have a dual exhaust port to the EGR port (both inside exhaust ports go up to the exhaust crossover in the intake) then there's a good chance the heads are cracked. These are very thin castings that don't take heat very well. You're better off going with a set of 992 or 993 castings if you want to use 76cc heads. They have thicker castings can can be opened up more.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block (times are for the current engine)

Best ET on a time slip: 11.447 altitude corrected to 10.99
Best MPH on a time slip: 119.42 altitude corrected to 124.86
Altitude corrected rear wheel HP: 493
Best 60 foot: 1.586

Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

John Lingenfelter specifically mentions the 882's as having good flow (due to the sheer size of the 76cc combustion chamber) when a 2.02 intake valve is added, and the requisite pocket porting is accomplished. He also goes on to mention that they are very thin castings that are prone to cracking and recommends that other heads be chosen instead of spending lots of money on the 882's.

 

These heads top my 355ci which I just got on the road today, actually. Yay me.

Unmolested, they will crank out 310-315 horsepower, and then slam into a brick wall unless you wake them up a bit.

Using a CompXE262, a Performer intake, headers, flattops, worked Qjet, and 89octane gasoline my car really yanks from 3,000-5500RPM where I shift. A good little street combo. However, the average 5.0FERD still puts out a viable competition. LS-1's will smoke you. How does that feel? =)
I paid $50 bux for my 882's, and only spent a few bucks on them, so it wasn't a bad deal. If they need some major re-working, forgettem. Go Vortec. If I had money, AFR's baby. Hooooo yah.

Later,
Hype.
-gotta make a sig.

 

i have a set of 882's on my 350(.040 over), i am hoping to buy some vortec's(only $700 and you get gaskets and a intake)

i agree they seem to pull real good above 3000, but ive never taken the motor over 4500. Im not sure about 310HP stock though. But then I am not too sure on those cam specs either.

I dont really know about how cams work, I just know from my car, I dont seem to get the car over 4000RPMS so getting a radical cam made for 2500-6000RPM is kind of pointless on the street.

Can you get a cam that has brute torque on the bottom end and HP up top? or when you goto a bigger cam do you sacrifice torque for HP? Isnt torque better?

 

Chevy High Performance did flow testing on a whole butt load of heads, this is what they have for the 882: stock no machine work, 1.94/1.50 valves, 151cc intake port
I E
.100 70 58
.200 125 105
.300 175 135
.400 204 141
.500 205 142
.600 206 142
Here are the comments they had: "This head had the smallest port size of all the heads we tested. A set of 2.02/1.60-inch valves can be swapped in but be aware that without blending the short side radius, the results usually find lost airflow."



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Joshua Johnston
1991 Z-28


350, T-5, K&N, Ported Vortec heads, Edelbrock RPM, Holley 750 D.P., HEI, 11.07:1 CR, Comp Cams Roller-.510"/.520"-282*/288* dur., Shorty Headers, Dual 2.5 Exhaust,Dynomax Bullet Mufflers, T&R Motorsports custom air intake

 

Now I know flow #'s aren't everything, but...

Notice the flow difference between .400 and .500" lift. None.

No matter how rowdy of a cam you slam in there, it's going to only flow so much.

I'm happy with my CompCamXE262 & 882 combo, total low buck build with decent power. All I need now is a bigger, badder set of headers.

note: when guys on here get on you to do your exhaust FIRST, listen to them. =P

Later,
Hype.

 

My 3" flowmaster shouldn't be a problem for exhaust flow.