worked over 882 heads?? about what will they flow?

[1981coupe400ci]

if a set of 882 heads with 2.02/1.60 valves were ported and gasket matched. how much better would they flow about?? i know the 882 is about the best flowing smog head... and i know i cant get an exact # but i just wanna know about what they flow after porting.. like 10CFM more than stock? 30CFM more than stock??? just a ballpark # is all i need.... i have stock numbers and i wanna update them in the DD2000

[BluEyes]

ported flow REALLY depends on who did it, and how well it was done.

According the the CHP flowtest, they flowed:
In Exh
0.05 39 34
0.10 70 59
0.20 125 109
0.30 175 136
0.40 204 143
0.50 205 144
0.60 206 145

This was with 1.94/1.5 valves.

------------------
-'77 Camaro - 357, home-ported heads and intake, Q-jet, headers, hyper flattops, ~8.5:1, 3.42 gears, 214/224 cam, 112LSA, rear discs coming soon
-'92 LeBaron LX sedan - all family owned, great daily driver and highway cruiser. 52mm TB, rear discs swapped. 5-sp swap in the works.
-'70 Camaro - 350, 4-sp, needs work, lotsa fun
-'65 Nova - 230 I6, 3 on the tree, nothing power. HEI swap. 5sp and 4 wheel discs in the works.

[1981coupe400ci]

<font face="Arial,Verdana" size="2">Originally posted by BluEyes:
ported flow REALLY depends on who did it, and how well it was done.

According the the CHP flowtest, they flowed:
In Exh
0.05 39 34
0.10 70 59
0.20 125 109
0.30 175 136
0.40 204 143
0.50 205 144
0.60 206 145

This was with 1.94/1.5 valves.

</font>

thats stock numbers i assume?? cause those are the numbers i already have for the 882 heads..

That is the stock numbers in their article I believe, but you can't ever believe anything a magazine says. They almost always have some vested interest in ANYTHING they say.

[79Z-28]

I had set of 882 on my 355 and was told not to waste the money on porting.For the same money you can get a set of vortec's out of a junk yard and have them machined to fit the old intakes and make more power.Instead I went with a set of trick flow heads for racing.

[BLAZER87]

The 882's aren't the best because of the light casting that's prone to crack if overheated. (well, there is a heavy and light casting) Anyway, I've been told they aren't the best flowing smog head, a 993 is actually a better head. I ported a set last winter to use on my 355 cause it was all I had vs a set of small valved 305 heads. I'm not sure about flow numbers, but after changing both cam and heads, my motor really woke up. I've pushed it too 4500 rpms, but it fell off due to the carb being too small. This motor was really weka witht he other heads, but the 882's woke it up quite a bit. I have since gotten a set of 993's and 624's and will probably use either of those next go around.

[BluEyes]

Yes, those numbers are stock. I assume they hot-tanked them first though - mine certainly wouldn't have flowed that with all the crap built up in the ports! Actually, the 882's didn't look that bad at all in the CHP flowtest - for pre-vortech factory heads, that it. They were right there with the L98 aluminum heads, which are thought of as being pretty good.

I don't see what interest they would have in making factory heads look good. If anything, they would have posted lower numbers for the stock heads to make Dart, AFR, etc look better. Their numbers for Vortechs are right on with what other sources say though. They also made the Pro Topline heads look really bad - came nowhere near the advertised numbers for those heads.

I'd agree, if you're going to pay someone else to port the heads, don't bother - get the Vortechs. If you are the DIY sort and have a good grinder, it can be worth your while.

[1978LT]

<font face="Arial,Verdana" size="2">Originally posted by BLAZER87:
The 882's aren't the best because of the light casting that's prone to crack if overheated. (well, there is a heavy and light casting) Anyway, I've been told they aren't the best flowing smog head, a 993 is actually a better head. I ported a set last winter to use on my 355 cause it was all I had vs a set of small valved 305 heads. I'm not sure about flow numbers, but after changing both cam and heads, my motor really woke up. I've pushed it too 4500 rpms, but it fell off due to the carb being too small. This motor was really weka witht he other heads, but the 882's woke it up quite a bit. I have since gotten a set of 993's and 624's and will probably use either of those next go around. </font>

993's no doubt! The 624 is a weaker version of the 882 heads. The intake ports are smaller at the top than at the bottom. Plus they are a lightweight casting if I remember right.

There are actually two versions of the 882. The light and heavy casting. Someone had a way to identify them around here somewhere, but I am too lazy to look it up at the moment.

[1981coupe400ci]

i know they aint the best.. and i'm not asking that.. i'm just asking what about i should add to the original flow #'s if they were ported cause i have a set of worked over 30miles on them pinned studs and all 882's and i dont wanna waste them...

i have the receipts from what was done and they have about $650+ worth of brand new parts and work done to them(about $200-250 in parts and the rest in work+labor) so i'm going to use them

[This message has been edited by 1981coupe400ci (edited January 17, 2005).]

[This message has been edited by 1981coupe400ci (edited January 17, 2005).]

[1981coupe400ci]

<font face="Arial,Verdana" size="2">Originally posted by 73454:
There are actually two versions of the 882. The light and heavy casting. Someone had a way to identify them around here somewhere, but I am too lazy to look it up at the moment.</font>

i know how to i.D them... the H.D base looks like this __________^____ the L.W looks like this -u--u--u--u--u- or somehting close to that... again thats not what i'm asking


[This message has been edited by 1981coupe400ci (edited January 17, 2005).]

[Dirt Reynolds]

Unless I'm mistaken, the 624 is the lightweight version of the 882. The 993 is the best open chamber head.

------------------
'Silver Bullet' 1977 Z-28 413" SB
11.73 @ 115.10 on drag radials
Old Vortec combo:
12.15 @ 110.52

[MrC]

I second Dirt, the 624 is the lightweight casting.

------------------
//Fred
11.58@116 N/A SBC

[1981coupe400ci]

back to what i should add for flow numbers over stock?? add 10CFM to each number?? just a ball park on what i should add to the stock numbers is all i need for the DD2000....

[Marv D]

To increase flow 20cfm on an 882 casting would be an OUTSTANDING job, not just a backyard gasketmatch and bowl cleanup. Use +10cfm for a ballpark.