View Full Version : double hump or 882 heads


81phaseII
03-24-2012, 03:12:17 AM
i have a 355 with flat top pistons running 882 heads with a lunati 213/219 duration .454/.468 cam edelbrock preformer eps and a 600 cfm edelbrock carb all in a 80 camaro the engine runs strong but i recently aquired a set of 461 double hump heads they have a 3 angle valve job and screw in studs i know the swap will raise compression but is it worth the swap? any info is appreciated and worth the imput. thanks

cmonson
03-24-2012, 07:48:32 AM
Yes, besides raising compression I believe the humps also will flow better. As a side note there are some who get good results with a good port job which bring them close to a modern day aluminum head. Something to consider before installing them.

old blue 75
03-24-2012, 08:10:06 AM
The combustion chamber is worth some hp also.

ProStreet383
03-24-2012, 09:27:36 AM
The doublew humps flow better, will raise the compression and they have a better chamber design. 882's suck.

77_4speed
03-24-2012, 09:53:06 AM
But the 461's don't have accessory holes on the front of them, right? Will that be an issue. I was going to put a set of 461's I have on my '77, but couldn't for that reason.

Mike-78 Z-28
03-24-2012, 11:42:41 AM
But the 461's don't have accessory holes on the front of them, right? Will that be an issue. I was going to put a set of 461's I have on my '77, but couldn't for that reason.
They add to the expense but you can get conversion brackets here http://www.alangrovecomponents.com

strstk71
03-24-2012, 12:59:30 PM
or you could just drill and tape the head for the accessorys

scot1074
03-24-2012, 01:09:51 PM
If you can you should try and at least gasket port those heads! But like others said there is no acc. holes and if you drill them you run the risk of oil leaking. just make sure to use something on the threads. I used these same heads in my vega. I had to use the short water pump and pulleys. I hated that setup, I keeped thoughing the belt.

hhott71
03-24-2012, 01:17:25 PM
Go to Vortec heads, or find some 041, 186, 492 heads.

hogg
03-24-2012, 01:28:48 PM
I have used an am using the 461 double hump heads , these have been on for 4 years with no trouble, drilled the holes and put in studs with sealer, the place where you drill is very thin and goes into water jacket or the oil, seal good,also pined the rocker studs.

zl1camaro
03-24-2012, 01:53:19 PM
these would be great for a daily driver, and they can be turned into 2.02 heads.. .woo hoo... http://www.jegs.com/p/GM-Performance/GM-Performance-Parts-Cast-Iron-Vortec-SBC-Heads/749896/10002/-1

quick79z
03-24-2012, 03:18:15 PM
882 sucks, unless you absalutly have to run them, dont,

strstk71
03-24-2012, 03:43:06 PM
yep 882 are thin smogger head that are not the best for anything

81phaseII
03-24-2012, 03:53:59 PM
thanks everybody for the imput im goin for the double humps. i got arp rocker studs and a set of z28 springs on the way. should be a killer combo when i get done and yes the 882 heads were all i had after a engine meltdown destroyed my 441 heads as for the brackets my budies own a machine shop. so no problem. thanks for the help guys. :)

hhott71
03-25-2012, 06:30:57 AM
You can still buy the ALT, PS brackets and pulleys from GM and other sources if you go with the short water pump.

Show7d3
03-25-2012, 07:53:29 AM
I have 462 heads (no acc. holes) on my 350 and used this bracket for the alternator. http://www.jegs.com/i/March+Performance/655/20122/10002/-1
It bolts in place using the water pump mounting bolts. Works great! The lower alternator mounting point gets sandwiched between the outer bracket and the March inner one.

Rich Schmidt
03-26-2012, 08:13:55 AM
I drilled my double hump heads on the driver's side for the A/C bracket.I dint bother with the passenger side. I figured out a trick to that years ago. If you dont attach the upper alt bracket to the water neck the belt wont toss. If you think about it,the factory camel hump setup had the alt hung way out far on the driver's side on flimsy brackets and the alt waved back and forth a ton. The trick was that if the alt moved evenly both top and bottom the belt stayed on. If the top of the alt stays put and the bottom swings(as is that case with the stock bracket and no bolt in the head) the belt flys off. I have been using this setup for decades with perfect results. I am going to post a link to how I drilled the holes in the driver's side head for the A/C bracket. It was easy and has caused no issues or leaks so far. Give me a minute to find the tread and cut and paste it into this tread.

Here it is. My tread about drilling the holes.

http://www.nastyz28.com/forum/showthread.php?t=217233

Here are a few pics of the performance work that helps my 408 in a 3500# car run as fast as my friends 200CC dart headed 400 ran in his 2900# car.

Port matched to a stock gasket(not a lot of work). Also a low buck spring kit that consists of Z/28 springs,steel retains and new locks. They also have PC seals.

http://img.photobucket.com/albums/v310/racer7391/fuelie4.jpg

2.02/1.60 valve with back cut and 3 angle valve job(standard performance machine shop stuff). I blended the bowls,flatted out the short turn,and relieved the chamber a bit around the valves,then had the heads milled back to a true 64CCs. The valves are inexpensive Elgin stailess stock replacement pieces.

http://img.photobucket.com/albums/v310/racer7391/fuelie2.jpg

You want to steer clear of a lot of grinding on the exhaust. I went with a bowl blend,and widening of the short turn(the floor just behind the valve). When combined with the 3 angle valve job,this work has been shown to substantiall improve flow with minimal effort.

http://img.photobucket.com/albums/v310/racer7391/fuelie5.jpg

1BAD78
03-26-2012, 10:16:45 AM
Dont expect a huge gain in power. If it were me id sell the double humps to someone restoring an old corvette and buy a set of vortecs. Those will blow those old double humps out of the water. When I went from 882's to DH's I didnt feel a big power increase.

caribbean camaro
03-26-2012, 10:35:41 AM
882 sucks, unless you absalutly have to run them, dont,

Agreed they are basic heads - but it all in the combo - and for a budget motor with a good choice cam for your "OVERALL COMBO" - they give decent returns

and once you break out the nitrous - say 175hp to a 225hp - on a 355ci -they are great :D freshened with new springs - no port work

have a 355ci in the works right now - 214/224 SSI generic cam/ 882's' freshened with new springs - no port work /torker manifold (i know i know - not the best - but the plate bolts right up) / LT1 knock off 11:1 pistons from an old PAW kit and mr. gasket .020 gaskets

expect it to surprise me

77_4speed
03-26-2012, 10:51:42 AM
Dont expect a huge gain in power. If it were me, I'd sell the double humps to someone restoring an old corvette

Yes, that's what I would do too......sell them to someone who's looking for some and then go find something that you really want. I didn't wanna run Vortecs because I didn't wanna go with those center-bolt valve covers, and plus I like my stuff to look pretty stealthy and original.

I got some of these....2.02 camel humps with accessory holes

http://carphotos.cardomain.com/ride_images/1/1841/1861/4600930023_large.jpg

newschool72
03-26-2012, 06:44:09 PM
If I remember right:shy: , the 461s had 170cc intake ports vrs. 165cc on most of the other humpers. A decent set of heads and I dont think they are THAT far behind 041s in flow. i ran those on a 63 Nova with a 337(.060 327) years ago with a 125 shot and it was a strong runner. Way better than 882s but still only around 200 on flow #s.

muscl car
03-26-2012, 07:00:49 PM
i've seen a early model nova with a 327sbc with double humps go deep into the 11's and with a 200 hit get the car into the 9's so those heads still make decent power if you know how to massage them a little

newschool72
03-26-2012, 07:10:06 PM
i've seen a early model nova with a 327sbc with double humps go deep into the 11's and with a 200 hit get the car into the 9's so those heads still make decent power if you know how to massage them a little
Its all in the combo. Right gears and a good tune put a lot of hemis on the trailer back in the day. Good ol L79 Nova proved its not about power, its about power to WEIGHT!!;)

muscl car
03-26-2012, 07:20:21 PM
can't understand why people nowadays are so afraid to massage their own cylinder heads . just a simple pocket port /bowl blend , blend the short turn radius and you've picked up alot more HP .these new cast iron or aluminum cyl heads is alot like fast food as no one wants to do it their selves

newschool72
03-26-2012, 07:31:46 PM
can't understand why people nowadays are so afraid to massage their own cylinder heads . just a simple pocket port /bowl blend , blend the short turn radius and you've picked up alot more HP .these new cast iron or aluminum cyl heads is alot like fast food as no one wants to do it their selves
True that! But, it you buy a set of , say, RHS 220s and 5 angle, gasket match, and flatten the short side. MOOOHHAAAHAAAHAA!!! Then you are pushing 300 on the intake and have a potential monster on your hands!!;)

muscl car
03-26-2012, 07:38:12 PM
back in the late 70's and 80's especially when i was racing at OCIR we didn't have specialty style cyl heads like today we just worked over a set of stock cyl heads and made really good hp out of them

we would use the fabled chevy power catalog which included tech data,specification and special parts and it included evertything you needed to know how to make big hp out of the bbc and sbc back in the day .it even has a section on porting cast iron bow tie cyl heads . i still have this catalog i bought back in the early 80's

newschool72
03-26-2012, 07:56:13 PM
You should reprint and sell it to all these kids that dont know what it means to MAKE horsepower, not buy it.

muscl car
03-26-2012, 08:07:10 PM
that's what get's me people want to buy hp and don't understand the term making hp ,they just want the easy way out

strstk71
03-26-2012, 09:53:05 PM
Well when a new set of new aluminum heads that flow better cost the same as building a set of old iron ones. A 3 angle valve job port and polish bowl blending flow bench are out of the reach of or out of the ability most guys so, you buy them.

Rich Schmidt
03-26-2012, 10:08:15 PM
I only used mine because I wanted an engine that didnt look like much. There is a lot of trickery in it though. Its a 408 with 10.1:1,has as much cam as I could get away with while still having a somewhat stock idle,the camel hump heads have a modest amount of work done to them,the Torker 2 intake is a running joke in the performance world,but if you match it to the heads,blend the plenum,add a small spacer and run a lot of carb it makes great power. I kept the original points distributor with an electonic module in it,added a performance coil with the sticker peeled off. I bought yellow race wires then used carb cleaner to wipe the name off them and a socket style cap because they look outdated. A ot of guys who build sleepers try to paint everything to make it look plain. Thats a bit of a problem. If somebody sees that you have headers and a performance intake,but painted valve covers and no other dress up,it throws up a red flag that you are hiding something. I added cheap low rise chrome valve covers with the pop top T handes,a cheap chrome lid on the stock single horn air cleaner,and a chrome water neck.I can pass my engine off as a warmed over junkyard 307,or a stock 327,but its a money making mo-fo at the money races. BTW,the Torker 2 intake is da bomb for hiding nitrous.

The old camel hump heads are the Rodney Dangerfield of money racing engine parts. They cant get no respect. :)

Thats why you run stock cylinder heads.

Just a worn out old junkyard 307 with some "fuelie" heads. You wanna race? :)

http://img.photobucket.com/albums/v310/racer7391/Car%20pics/enginepic2.jpg

muscl car
03-26-2012, 11:01:55 PM
Well when a new set of new aluminum heads that flow better cost the same as building a set of old iron ones. A 3 angle valve job port and polish bowl blending flow bench are out of the reach of or out of the ability most guys so, you buy them.

just look at it this way it's the same principle like building your car or having someone build it for you and i know that stirs up some heat everytime it's brought up . so cyl head porting/polishing is the same way just like newschool mentioned "make HP" or "build HP"


most of what i explained is relatively easy to do and isn't that difficult and when done you'll definitely notice a difference .takes about about an hour or so per cyl , i learned how to do this back in the 70's and 80's and once you know how to do it takes no time at all .get yourself a junkyard set of cyl heads to practice on and with a good set of cartridge rolls and abrasive bits/cutters and in no time you'll like doing this knowing it's cheap hp

Rich Schmidt
03-27-2012, 07:39:15 AM
Although I have been touting the virtues of porting stock heads,I will also say that I spent a good buck on these stock heads. I spent about $65 on valves,$90 on the spring/retainer kit,then I spent $600 at the machine shop getting it all done with new guides,opening up for larger valves,machined for PC seals,3 angle valve job ect. And that was without hardened seats,so they still technically need leaded gas. Add another $150 or more for hardened seats.

You could reuse all your stock stuff including your valves,just add some fresh springs,and have them rebuilt with a 3 angle job and only the guides that need attention repaired,but you will still spend about $400 on labor and $35 on cheap springs. Its your call.

REARSPROCKET
04-01-2012, 10:25:33 AM
First off referring to OP 461s all the way and twice on Sunday. I have 461X heads that are milled too much (the way I got them) and spent a lot of money on them with new guides, valves, guide plates & studs, port and bowl work and yatta yatta yatta. These heads perform outstanding, but would I do it again? NO, I would go with a new set of Small Port Bowtie Vortecs, they will cost almost as much as what I have in these, but come with a better chamber, ports, and Acc holes. :bowtie:

ThumperZ28
04-01-2012, 01:24:28 PM
i have a 355 with flat top pistons running 882 heads with a lunati 213/219 duration .454/.468 cam edelbrock preformer eps and a 600 cfm edelbrock carb all in a 80 camaro the engine runs strong but i recently aquired a set of 461 double hump heads they have a 3 angle valve job and screw in studs i know the swap will raise compression but is it worth the swap? any info is appreciated and worth the imput. thanks

Like mentioned before ..just gasket port the 461 cylinder heads ...and you should be good to go...
I have a similar combo
355
That same bumpstick
9:5.1 compression
GM aluminum intake manifold. Ported
750 cfm q-jet
but the cylinder heads are the edelbrock e street
64 CC chambers 2.02/1.6 valves


180cc intake/70cc exhaust runners

..it is one torquey SOB, which is perfect for the street

ThumperZ28
04-01-2012, 01:36:52 PM
I don't get why some suggest you buy something else ....they're failing to see that you already have the cylinder heads but just wondering if itll work better than tge current ones you got..instead of telling you ohh get some vortec heads

strstk71
04-01-2012, 03:59:46 PM
I don't get why some suggest you buy something else ....they're failing to see that you already have the cylinder heads but just wondering if itll work better than tge current ones you got..instead of telling you ohh get some vortec heads

I agree the Vortec head is not alot better then the 461`s they are better but not as much as a set of dart sportsmans/SR.Then you have to mill your intake or buy a new one then you need new valve covers. The costs of buying all the needed parts or of machining makes no sence to me for not alot of gains when you could use the 461/62 heads (or buy the sportsmans/SR`s) put that money into other places that could use it.

Ole Blue '74
10-14-2012, 09:19:50 PM
If I remember right:shy: , the 461s had 170cc intake ports vrs. 165cc on most of the other humpers. A decent set of heads and I dont think they are THAT far behind 041s in flow. i ran those on a 63 Nova with a 337(.060 327) years ago with a 125 shot and it was a strong runner. Way better than 882s but still only around 200 on flow #s.


462’s and 291’s had the 171 cc intake ports as well and the 462’s had the raised exhaust ports as well!