89305RS

Ok i know this has probobly been asked 30000 times on here(did a searchbut couldnt find the answer im looking for) BUT would these heads be good for a street motor making a bit over 300 HP with a forged piston on 10:1 compression? Or would it be better to go with a 305 TPI head?BTW this is a .040 over 350 with a 100 shot of spray. I can port and polish myself. I can get them for pretty cheap so any input is welcome.

five7kid

iTrader: (14)

Of course you can get them cheap. Because you should get paid to haul them away.

Porting is pretty much worthless on them.

You might get 300 HP using them with a 100 or 125 shot.

Of course, with "real" heads, you could 300 HP easily w/o the shot.

nsimmons

Bull. I have ported 882s, and yeah I may not be lightning fast, but im fast enough to work my buddies lt1 vette, from a stop, from a roll, and on the freeway. Plus an assortment of local hod rods, a big block el camino, new mustangs. Its plenty fast for a daily driven street car.

If you can get them for 50 or so and they dont need major work, they'll get you to 300hp+

Quality port work is a must, i spent 30 hours going over mine until they were perfect. With the right cam the car pulls very strong from 3500-6000rpm. My major problem is i cant wind the engine out completley because it keeps tossing belts. Mind you Ive triple checked the pulleys and shimmed them, but since I switched to a dayco top cog and its been fine for 500km's. Im switching to a serpentine setup in September.

Of course there are better heads out there, but if your on a tight budget and dont mind some tweaking they'll work. With 100 shot, you'll make 400hp easy.

five7kid

iTrader: (14)

A nice story. But devoid of data.

Being able to spin an engine to 6500 RPMs doesn't mean it's making power. Put the same $'s and effort into a set of 882's and a set of 416's or 081's, and the little ol' 305 heads are going to walk all over the 882's on top of a 350.

If you aren't careful, you're going to get RB started...

430T/A

Bull yourself! 882s are very durable, and plentiful. An 882 works great for it's intended purpose. Which is 4500 and below. too many guys try to spin them up to 5500 or 6500. Well beyond their flow capabilitys. If build your motor around them and select an appropriate cam, intake and carb, very good power numbers can be had. Of course, 882s fall victim to the "bigger is better" philosphy when it comes time to pick cams and that sorta stuff. So the whole motor is out if balance.

That being said, Porting and polishing a set of 882s, well really is worthless. Yes, if you know what you are doing, you can improve the flow characteristics somewhat, but it's not worth the time, or cost. But, there is no real sense of using the squeeze until you get a better set of heads. And yes, I do realize that last sentance contradicts my whole first paragraph. Howabout this, You shouldn't use nitrous until you get a set of heads designed for performance use.

nsimmons

Devoid of data?

"Porting them is wortless"

Define worthless.

"You might get 300 with n20"

Show me a dyno sheet.

"Because you should get paid to haul them away"

Boy thats not opinion, good thing you gave him actual applicable experience. Maybe you have some, but i dont see any in your post.


You are completley correct on more benefits from better heads.

My point is trying to get past the stubborn mentality on this board. If its not the best its not worth the effort. What ever happened to making the most with what you have aka hot rodding? Granted he doesnt have the heads yet, but maybe he doesnt have any and this is the best he can find.

If I had listened to you and others in particular a couple months ago about these heads, the car would still be not running, and i'd have spent 50% more money. The end result is much more than i expected and I am very pleased with it.

I shift an engine when it stops making power, its still pulling strong at 5500, so why should i shift earlier.

Prove im wrong. He wants information. I give him directly applicable, recent results with a comparable build up. You give him opinion formed from who knows where. Drive my car for a week then give him advice.

Let him make up his mind, but give all the facts. If the heads fit his goal, why waste more money.

I thought this board was about sharing information, not impossing opinion.

shaggy56

I dont want to be on anyones side but there are real dyno sheets on these heads and they arent so bad for street.



http://users.erols.com/srweiss/tablehdc.htm

All the flow numbers and dynos were taken from carcraft.

On this page you can see a comparison between the aluminum l98 heads and the 882

http://www.chevyhiperformance.com/te...98/index4.html

89RsPower!

the point hes trying to make is that both 416's and 081's are extremely easy to come by, they're everywhere and they can be had for next to nothing and are a much better starting platform then 882's. Around here sbc heads are $30 a pair at local boneyards, with that in mind it makes more sense to go for the better casting. All three are low budget options its just that the 416's and their centerbolt counterpart the 081's make a whole hell of a lot more sense.

nsimmons

I understand his point, and agree with it, but i am calling BS were i see it. He claimed it might make 300hp with nitrous. That is clearly false as shown by any number of dyno sheets online, easily accessible. Heres 2

http://www.allchevynova.com/nova/dyno.html
http://www.hotrod.com/techarticles/63200/index2.html

Stekman

Why is porting them worthless? 882's durable? If you consider thin castings between the center 2 exhaust ports "durable" then sure. Their thin castings are prone to cracking as is, porting removes even more, making the walls that much more thin. (on the lightweight 882's)

76cc combustion chambers. If you like low compression, then sure. Other than that, domed pistons would be needed to restore any form of compression. That or angle milling.

Yes, stock vs stock, 882's actually do flow pretty well. But the second you pick up a die grinder with any 305 head, 882's become obsolete. With the 305 head you get better flow and better compression all out of a casting that isn't prone to cracking like the 882 smogger crap heads.

They fall in line with the 993's and 624 castings.

I have an 882 head. It works wonders. I had a shop clean it up real nice, I coated it to prevent rust or anything like that. I tied it to a rope and it securily anchors the boat.

Thats my few pennies. Go buy a few tootsie rolls.

89305RS

thanks guys. Cant we all just get along?

nsimmons

we like to argue

five7kid

iTrader: (14)

My, a lot happened while I was gone.

Yes, we do like to argue, don't we?

I was digging up my data. All the "right" things done to 882's (cleaned-up ports {although admittedly not "fully ported" or flow optimized}, cam, intake, headers), 195 RWHP on a 350 (based on converted dragstrip data).

Using the same calculations, my 305 makes 245 RWHP.

Oh, one of those 882's was a replacement for another that had split open on the outside casting line.

Note in the CHP article that there was next to no increase above .400" lift. The dyno article engine made max power at 5000 RPMs. The Nova story was a 406 CID engine that peaked out at 5100 RPMs, and he only claimed 334 HP flywheel (50 more cubes, remember). None of that suggests 6500 RPMs (or the edited 6000 RPMs) is a reasonable expectation.

Perhaps "worthless" was too strong. Make that "not the best use of time/money".

430T/A

You caught me there, the later model 882s that are thin, do indeed crack easy. I stand by my statement, for their intended purpose they work great... Its a good low-end torque head, with limited top-end capabilitys (read: bad)

shaggy56

Well for argument sake post some worked 305 heads. With dyno sheets side by side then you have an argument. We are talking about using cheap heads that perform. So say they all suck but thats not the point of the thread is it?

F-BIRD'88

The 305 head is by far the better starting point.
better casting, center bolt covers, much better chamber and plug position. smaller chamber that you can tweek to any reasonable size to get the cr you want on a 350.


89: If you have the 305TPi heads available to you to port and improve( larger valves etc) you'll end up with a better head all the way around , than a ported 882.

Go with 1.94x 1.60 valves for a 350 buildup.

the center bolt covers are worth the difference just by themselves, (don't leak)

Don't feel you'll be trapped with a 58cc combustion chamber, You can tweek it to pretty well anything you'll need for a street 350 buildup.

Search my posts on porting 305 heads.
I've done up quite a few of the 416 castings and they are a blast. Work very well. 882 heads are a :nono:

rjmcgee

I had a set of 993 heads in my yardsale a few weeks ago for 5$.

Had to haul the damn things back to the storage shed too, should have put free on them.

I went from the 993's to these Pro Action heads and the thing that amazed me was the water temp. Always run about 210 -215 before and now runs 180 -190. I think that they are just very poor castings overall, like there was a restriction in the water passages or something. Start with a better casting and you will be much better off in the long run.