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Old 09-29-2004, 08:02 PM   #1 (permalink)
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Heads and Carb on 383?

I am finishing a 383 build from my old 350. I am at a point I need to get some heads. I have been looking at some Dart Iron Eagle. It will be a DD so nothing too radical, but some good heads for whenever I need to turn it loose. So maybe 72cc with 180cc Runners? These seem to be good heads, what do you think? Also I am planning on using the Edlebrock Performer EPS intake with their 600cfm carb (1405). Will that be big enough? It will be in an '85 3/4 ton. Thanks, Alex
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Old 09-29-2004, 09:06 PM   #2 (permalink)
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I would be looking at a 750 Quadrajet carb and a Performer intake. If you have a big cam you will want to step up to a Performer RPM Air Gap. If you don't mind a bit less mileage you can pick up a bit of throttle response with a 750 Holley double pumper or a similar BG carb.

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Old 09-29-2004, 11:34 PM   #3 (permalink)
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Head selection and carb size really depends on a the cam and valve train.Is it a big cam with high rpm potential?Or small daily driver type grind?Big cams with high rpm ranges need big ports on the heads and big carbs to support them.I have been looking at the dart iron eagle heads for the 327 in my 55 pu havent seen any thing bad written about those heads probably a good choice,call the mfg and ask what they recommend.
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Old 09-29-2004, 11:40 PM   #4 (permalink)
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I just went thru this with my 3/4. I am using ported GM heads, 9.6:1, RV ground cam (1500-4000 power band, don't have the specs handy). I was going to go 750 and was talked out of it by several people as it was overkill. A 650 is good to 425HP. I ended up with a holley 600, similiar to that 1405.

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Old 09-30-2004, 12:06 AM   #5 (permalink)
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Square bore Edlebrock carbs aren't exactly the best carb off road! You need to research some more!
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Old 09-30-2004, 02:38 AM   #6 (permalink)
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...yep if you need the carb to work off-road in steep or off camber terrain stay with the Quadrajet. The Edelbrock Quadrajets are very nice also and can be had in 800 and 850? CFM versions also.

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Old 09-30-2004, 07:04 AM   #7 (permalink)
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It all depends on what you are doing with it... I personally have a set of 882s with big exh valves (1.6) with a little porting and polishing and a holley 750 vac secondary with a proform main body.... this is on my mudbog truck so fuel mileage and efficiency arent what I am concerned with..... A bud of mine has a 383 with dart IE 215s that made over 500 hp its running a holley 750 double pumper so obviously its not fuel efficient Give us more info on the cam, use, and build of the truck... higher stall converter? gears?

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Old 09-30-2004, 07:52 AM   #8 (permalink)
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I've heard good things about the GM performance parts Vortec heads.

Apparently they flow better than the old "camels" and relativly cheap.
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Old 09-30-2004, 10:17 AM   #9 (permalink)
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Flow will probly be your biggest advantage on the 383. I would find a really nice flow numbered head that didnt take any porting, shop around edelbrock-trick flow-air flow research and a couple others make heads for that block. If your crawling you may wany a simple rv cam or stage 2 cam.
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Old 09-30-2004, 10:49 AM   #10 (permalink)
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Quote:
Originally Posted by thomjpster
I've heard good things about the GM performance parts Vortec heads.

Apparently they flow better than the old "camels" and relativly cheap.
Yea they're great for factory heads but they still come up short for a hi-po 383..

(EDIT: as far as many aftermarket heads potential)
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Old 09-30-2004, 12:29 PM   #11 (permalink)
 
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Yea they're great for factory heads but they still come up short for a hi-po 383..

(EDIT: as far as many aftermarket heads potential)
They are great heads for a DD. Hard to beat for 500.00 for a pair complete. Just make sure you get the matching intake for them, as they have 8 manifold bolts instead of 12.
Plenty good for 400hp easy on a 383.
And get a quadrajet. Any other carb is a downgrade.
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Old 09-30-2004, 05:38 PM   #12 (permalink)
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It will be mostly a DD. If it is off road it will be mud or some trails. They arent' too steep so of camber isn't really an issue. I was just wondering if the 600 was big enough. It will be a mild hydralic cam for tourque, Low RPM Hp range. I am gonna have a 700R4 with 4:11 gears.

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Old 09-30-2004, 08:20 PM   #13 (permalink)
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I was looking through my comp cams book tonight and here are the cam numbers,
Hydralic Flat Tappet
Duration @ .050" Lift w/ 1.5" rocker
IN. 218 IN. .462
EX. 226 EX. .480
The powerband is 1,300-5,600 rpm.
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Old 09-30-2004, 08:42 PM   #14 (permalink)
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Originally Posted by 77'/85'scottspecial
I was looking through my comp cams book tonight and here are the cam numbers,
Hydralic Flat Tappet
Duration @ .050" Lift w/ 1.5" rocker
IN. 218 IN. .462
EX. 226 EX. .480
The powerband is 1,300-5,600 rpm.
Keep in mind that comp cams rpm range shown is for a 350. Yours will probably be about 200 rpm less. There's alot of heads out there, but if you can afford them. I'd buy the fastburn GM heads for this combination and run a 3310 780 Holley Vacuum secondary, or the new Q-Jet. A 600 CFM may work only if you use an open plenum straight runner intake like a Victor JR. Sounds though like the way your building this you should use a timed runner intake such as Edelbrock Performer air gap.
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Old 09-30-2004, 09:06 PM   #15 (permalink)
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I would definitely consider ONLY a Q-jet, if you consider a carb at all.
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Old 10-01-2004, 10:02 PM   #16 (permalink)
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Why only a Q-jet? A 780?, That big? Fuel milage is a consideration also. Thanks guys
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Old 10-01-2004, 11:41 PM   #17 (permalink)
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Quadrajet is a vacumm air valve style carb--with proper tuning you will get excellent mileage approaching that of an EFI rig.

Jason
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Old 10-02-2004, 12:42 AM   #18 (permalink)
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I would finish that motor off with vortec heads, performer (not performer RPM) vortec intake, and a Q-jet carb. What cc's are the pistons you got? Vortec's are 64cc and if you have flat top pistons it will have too much compression.

Q-jets are spread bore carbs. They have small primary butterflys that will get you good mileage. They also have huge secondarys with a vacuum air door that will make as much power on the top as you need. Like everyone else said any other carb will be a downgrade. Check out the price of the new ones that Edelbrock makes...there is a reason it is their most expensive carb.
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Old 10-02-2004, 06:23 AM   #19 (permalink)
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The Q-Jet is a centerfloat Carb. It has less chance of flooding on an incline. They are finicky though and require jetting and metering rod changes to achieve best results for an individual application. Also, the stock vortec heads comment is if you want OK power. You will maximize the motors capabilitys with a larger intake runner volume. Your cam and cubes want more than 170cc intake volume. I'm 43 and would go with the smaller heads, but you have to figure out what your planning to use the rig for?
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Old 10-02-2004, 08:24 AM   #20 (permalink)
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I would finish that motor off with vortec heads, performer (not performer RPM) vortec intake, and a Q-jet carb. What cc's are the pistons you got? Vortec's are 64cc and if you have flat top pistons it will have too much compression.

Q-jets are spread bore carbs. They have small primary butterflys that will get you good mileage. They also have huge secondarys with a vacuum air door that will make as much power on the top as you need. Like everyone else said any other carb will be a downgrade. Check out the price of the new ones that Edelbrock makes...there is a reason it is their most expensive carb.
Why specifically NOT an RPM intake? It's been proven in the past that you don't generally lose anything with an RPM, only gain at all RPMs.. (i think HotRod or CarCraft did it, but I'm having a hell of a time digging it back up..)
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Old 10-02-2004, 08:47 AM   #21 (permalink)
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The pistons will make 9.4:1 compression with 64cc heads. So something like this or the 750cfm would be Ideal? Thanks
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Old 10-02-2004, 09:51 AM   #22 (permalink)
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The pistons will make 9.4:1 compression with 64cc heads. So something like this or the 750cfm would be Ideal? Thanks
Hey:
They've got a performance version with a reworked idle circuit for longer duration cams. I'd make sure and get this one with [email protected] on the intake. Otherwise, it probably won't idle right. You're only going to have about 16hg vacuum at ldle and they drill it out specifically for this.
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Old 10-02-2004, 03:23 PM   #23 (permalink)
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Why specifically NOT an RPM intake? It's been proven in the past that you don't generally lose anything with an RPM, only gain at all RPMs.. (i think HotRod or CarCraft did it, but I'm having a hell of a time digging it back up..)
You can't bolt a Q-jet to a performer RPM intake

That way when he puts on a rebadged carter AFB (aka edelbrock) he won't have to buy a new intake when he swaps it out for a Q-jet
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Old 10-02-2004, 03:56 PM   #24 (permalink)
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You can't bolt a Q-jet to a performer RPM intake

That way when he puts on a rebadged carter AFB (aka edelbrock) he won't have to buy a new intake when he swaps it out for a Q-jet
Before I went to injection I was running a Performer RPM with a Q-Jet. Do they not make it anymore? they old AFB is only good cuz it's almost idiot proof.
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Old 10-02-2004, 06:17 PM   #25 (permalink)
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The Edelbrock Q-jet and performer will bolt together won't it? Any part numbers on that performance carb for low vaccum?
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