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  #16 (permalink)  
Old 05-27-2012, 02:55 PM
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Quote:
Originally Posted by spinn
Vortecs are very good. Very affordable too.
I second, third and fourth that.
They flat out rock.

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Old 05-27-2012, 03:19 PM
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Using modified double hump heads. They can actually be made to work quite well if you know how to do them.



331 CI, pump-friendly 9.5:1 CR
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Holley 600 dp, choke horn milled and blended, Primary - 69, Secondary 74, Squirters - 21
1/2" Aluminum open spacer port matched to manifold, exterior polished
Edelbrock Performer RPM, port matched, exterior polished with all extraneous castings and lettering removed
Homemade lifter valley splash shield to keep hot oil off manifold bottom
Camel hump 1.94/1.50 heads hogged out to 2.02/1.60, pocket ported, port matched, pump-friendly hardened seats, 3-angle valve job
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Millerspeed 1-1/2 Gilmer under drive belt drive system (added after dyno run and found by Car Craft to add 10 hp @ 5,500 RPM)
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Old 05-27-2012, 06:17 PM
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I'm using the 462 double humps. They are not the 2.02, however, and they are about 62-63cc. I am also using flat tops, and my cr is estimated around 10:1.

Most noticable, I have seen a drastic change in throttle response, just a snappy motor. I did not port and polish however, in that I feel these heads are worth more original, meaning I do plan to use aluminum heads in the future. In the end, the biggest perk for using these double humps has been saying that my engine has the "double hump, or camelback" head. I spent $250 on them---complete and ready to go from an old drag racer on craigslist. I put new springs on them, that's it. Also I am using a lunati cam 1500-5500 rpm range.
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Old 05-30-2012, 02:55 PM
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New Heads

I would save my money and buy the Dart heads. With the aluminum heads you can get away with more compression. Upgrade the camshaft, 4:11 or 4:56 gears, 3500 stall, and a Holley 750. Possible to get into the 12's with these upgrades and a whole lot more fun to drive.
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  #20 (permalink)  
Old 05-30-2012, 03:42 PM
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the old double humps make great heads for 350hp, a valve job and some port clean up is about all they need...

They make lousy heads for anything approaching 400hp as they are way too small.
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Old 05-30-2012, 03:47 PM
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Again, totally erroneous statement.
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  #22 (permalink)  
Old 05-31-2012, 02:32 AM
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Quote:
Originally Posted by F-BIRD'88
The carb is way too small. Get a 750. Get a 10" 3500+stall. you want 4.10-4.30 or 4.56 gears in that car.


Some of the 76cc heads really suck (882, 624 etc) and should be avoided at all cost
SOme are better and have good potential with porting.
487X 441(X) 920

Old 462's 041's 186 etc can work well with porting etc but most are used up or cracked.
Usually cheaper to just go to a aftermarket head and port that if you want.

Vortecs rock. expect 60-80hp more a ton more torque and up to 1 full sec ET reduction over what you got now.

I don't bother looking for old fuelie heads any more. There is way too much good affordable new stuff to work with, now .
( Brodix IK200, Dart platinum Pro1 200cc and up)
Jegs has some cool 195cc aluminum heads they sell under there house brand name. I believe they are a Profiler "USA" casting.
The price is definatly right.

What is the car's MPH from your Drag time slips?
This tells you how much Horsepower you are making.
The time slips tell you a lot.

The 670cfm carb is way to small if you every want o go fast, new heads or

not.

If you are a low buck cheap *** do it your self er like me
I have had very good results with fully home pored 1.94x 1.60" valve #4416 305HO heads.
Not bad for the money invested but you must do the porting yourself and watch the budget.
easy High compression, good flow once ported.
12sec et's are easy with these heads once worked.
Keep it under $500 or go aftermarket.

If that interests you search my old posts. If not , cool....
882 heads isn't that bad. i did a et of 13.525 last weekend wit standard front suspension in a 72 nova 3600lbs 60ft time 1.83 now i got 90/10 shocks and a race on Saturday. i think i will get down to the 12s with the 882
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  #23 (permalink)  
Old 05-31-2012, 01:16 PM
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Quote:
Originally Posted by Scandinavian
882 heads isn't that bad. i did a et of 13.525 last weekend wit standard front suspension in a 72 nova 3600lbs 60ft time 1.83 now i got 90/10 shocks and a race on Saturday. i think i will get down to the 12s with the 882
What was your MPH ? this tells you how much HP you made.

13.5 etc is pretty tame. These heads are not worth reworking or spending money on.
You are just diggin your self a pit of disappointment.
You could pretty much slap on any other SBC chevy head and pick up a ton of performance over even worked 882's

There is a good on line article comparing worked 882's to a out of the box Dart
Iron Eagle 180cc head. (these are just entry level heads a small set up froma S/R head) I'm not even that crazy about the Dart 180's but its a good test comapro.
Really shows how lame the 882 heads really are.

Including dyno tests and flow bench comparo.

64 more peak horsepower

40 ft/lbs torque more at peak

more power at all rpm test point

much more rpm.

Like night and day.

A more advanced head will show even more power gain over 882's.

The 882's had a good bit of work done to them too.
They still sucked.

www.maxchevy.com

I did a straight up swap from 882's to vortecs on a 350SBC
gained 80HP a ton of torque and 1 full sec faster ET

I also tested my ported 305 heads on this same motor and car.
Big big gains in power over 882's very near the same gain as the vortecs.

easy 12's

The 882's are lame compared to everything else you can use.

90/10 shocks:

You are throwing good money to bad.

Change the cylinder heads.

I run stock shocks and factory sway bar etc and can yank the front wheels on launch.

Last edited by F-BIRD'88; 05-31-2012 at 01:29 PM.
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Old 05-31-2012, 01:47 PM
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I agree with AP72 about 350 ish HP capability on camel humps with good prep. Go to a circle track forum where guys have been running them for decades. Then you'll get the straight scoop. Also, talk to the guys at the drag strip you've been going to. Make sure you get a good set if you go that route. I'd have a machinest look them over first. Try to find a guy in his 50s who's rebuilt a couple of hundred.

The bump in compression will get you more than 5% because 8.6 to one isn't really optimum for a magnum 280. I'd guess more like 25ish with the bump, and power will go straight up with the power band.

If you can effectively pocket port a pair of camel humps you'll get the rest of the horsepower you need to get into the 13.3 range-according to all the calcualtors I ran-but who knows about those numbers? If you screw them up, your car will run slower than it does now.

The statement about no accessory holes is right on, and screwing around with new brackets is a pain.

My two cents. Most power with minimum hassle-Vortecs or other aftermarket. You'll get your extra compression and flow. Easier to get the accesories bolted back on. I think the newer Vortecs have holes for old style intake manifolds and valve covers. Can anyone confirm this?

Camel humps are not the dogs all the younger kids say. Friends and I been running them since the 70s and still like them on my 327. We have a little experience with newer engines too.

Here's Lon and Rods current fun machine.

http://www.millerdesignmfg.com/
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  #25 (permalink)  
Old 05-31-2012, 05:02 PM
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Quote:
Originally Posted by F-BIRD'88
What was your MPH ? this tells you how much HP you made.

13.5 etc is pretty tame. These heads are not worth reworking or spending money on.
You are just diggin your self a pit of disappointment.
You could pretty much slap on any other SBC chevy head and pick up a ton of performance over even worked 882's

There is a good on line article comparing worked 882's to a out of the box Dart
Iron Eagle 180cc head. (these are just entry level heads a small set up froma S/R head) I'm not even that crazy about the Dart 180's but its a good test comapro.
Really shows how lame the 882 heads really are.

Including dyno tests and flow bench comparo.

64 more peak horsepower

40 ft/lbs torque more at peak

more power at all rpm test point

much more rpm.

Like night and day.

A more advanced head will show even more power gain over 882's.

The 882's had a good bit of work done to them too.
They still sucked.

www.maxchevy.com

I did a straight up swap from 882's to vortecs on a 350SBC
gained 80HP a ton of torque and 1 full sec faster ET

I also tested my ported 305 heads on this same motor and car.
Big big gains in power over 882's very near the same gain as the vortecs.

easy 12's

The 882's are lame compared to everything else you can use.

90/10 shocks:

You are throwing good money to bad.

Change the cylinder heads.

I run stock shocks and factory sway bar etc and can yank the front wheels on launch.
The guy's in Finland. Not like he can go down to the local pick-a-part and get a set of L31's.

Drag shocks can help- sometimes a lot. "Yanking" wheels is cool and all- but is not the fast way down a drag strip.
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  #26 (permalink)  
Old 05-31-2012, 07:46 PM
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Vortecs are solid street pieces. Gains for even the mildest small block build.

Magnum cams are proven grinds. Summit has some nice budget street strip aluminum heads that are dynomite. Guy down the way has a set on his Nova and they work well on his 383. If you have a 280 magnum cam keep that compression up and save for good heads.

When I did my 305 , it was a fresh engine, and didn't want an unknown variable. The vortec heads and GM V6 beehive springs were under $200 for the pair. How can you beat that. I could have purchased the entire clean vortec 350 for about $450. I chose to wait for a clean 400sbc to go in my truck. Still waiting.
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  #27 (permalink)  
Old 06-02-2012, 01:31 PM
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Quote:
Originally Posted by F-BIRD'88
What was your MPH ? this tells you how much HP you made.

13.5 etc is pretty tame. These heads are not worth reworking or spending money on.
You are just diggin your self a pit of disappointment.
You could pretty much slap on any other SBC chevy head and pick up a ton of performance over even worked 882's

There is a good on line article comparing worked 882's to a out of the box Dart
Iron Eagle 180cc head. (these are just entry level heads a small set up froma S/R head) I'm not even that crazy about the Dart 180's but its a good test comapro.
Really shows how lame the 882 heads really are.


Mph 100-100.5 converter 18-20%


Including dyno tests and flow bench comparo.

64 more peak horsepower

40 ft/lbs torque more at peak

more power at all rpm test point

much more rpm.

Like night and day.

A more advanced head will show even more power gain over 882's.

The 882's had a good bit of work done to them too.
They still sucked.

www.maxchevy.com

I did a straight up swap from 882's to vortecs on a 350SBC
gained 80HP a ton of torque and 1 full sec faster ET

I also tested my ported 305 heads on this same motor and car.
Big big gains in power over 882's very near the same gain as the vortecs.

easy 12's

The 882's are lame compared to everything else you can use.

90/10 shocks:

You are throwing good money to bad.

Change the cylinder heads.

I run stock shocks and factory sway bar etc and can yank the front wheels on launch.
okey they are worthless. If i buy New heads ill go fore afr heads.

Last edited by Scandinavian; 06-02-2012 at 01:42 PM.
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  #28 (permalink)  
Old 08-10-2012, 06:38 PM
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Quote:
Originally Posted by Scandinavian View Post
okey they are worthless. If i buy New heads ill go fore afr heads.
I wouldn't say worthless.They will support more HP that has been stated here. But it is hard to beat some of the performance heads available now. Look at some of the Super stock guys running those heads and they flat out haul. The downfall is they have a ton of money in them.
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