cam and intake selection

[71chally416]

Thunder Series AVS Carburetor 800 CFM Manual Choke 
Item# 350-1812  $396.99 (Fuel fitting included)
 
Holley 65-4780 800 CFM Manual choke 
Item# 510-65-4780  $424.99 
Chrome Dual Feed Fuel Line 
Item# 510-34-150  $31.99 (Cheapest duel feed fuel line at Jeg's) 

1) $60 Cheaper (Jeg's prices)

2) Easier secondary opening adjustment with no additional parts needed

3) Easier metering adjustment with rod changes in a few minutes and jet changes without pouring gas all over the Intake manifold

4) Inpunity to engine backfires and no power valves to blow or select

5) The ability to use one or dual fuel inlets, or a single inlet on either side of the carb

6) Better mileage

7) 12 month complete satisfaction Warrantee from Edelbrock.

 

[NoMope Greg]

Thunder Series AVS Carburetor 800 CFM Manual Choke 
Item# 350-1812  $396.99 (Fuel fitting included)
 
Holley 65-4780 800 CFM Manual choke 
Item# 510-65-4780  $424.99 
Chrome Dual Feed Fuel Line 
Item# 510-34-150  $31.99 (Cheapest duel feed fuel line at Jeg's) 

1) $60 Cheaper (Jeg's prices)

2) Easier secondary opening adjustment with no additional parts needed

3) Easier metering adjustment with rod changes in a few minutes and jet changes without pouring gas all over the Intake manifold

4) Inpunity to engine backfires and no power valves to blow or select

5) The ability to use one or dual fuel inlets, or a single inlet on either side of the carb

6) Better mileage

7) 12 month complete satisfaction Warrantee from Edelbrock.

 

I'm sold.    Now to put together the rest of my shopping list.

[Chryco Psycho]

3 accelerator pump adjustments VS 14 with Holley type , 3 squirter sizes vs 11 with Holley type , 5 power valve /spring selections vs 8 with Holley type , no external float adjustment where Holley Type are , jetting changes require a $40 + kit of rods & jets which is more difficult to navigate to adjust while Holley is a simple pair of $6 jets to move up or down , Eddy carbs are not available as a double pump & I have yet toisee a well tuned Holley not be capable of making equal or better milage , Holley type also offer adjustable air bleed tuning for both idle & jet circuits on some models , this is not tunable on any Eddy carb that I know of

[71chally416]

I've never had a new Ed carb that didn't bolt on and run fine.

[Chryco Psycho]

I have , most are jetted way too lean & generally have the float levels set too low causing a stumble off idle

[71chally416]

Avoid the fuel economy versions of the ED carbs. They are calibrated  for completely stock motors. The EPS800 and Thunder 800 AVS are the only two I would consider using on a 440.

Another anvantage I forgot about is the Jet position in the carbs. It's impossible for the jets in the ED carbs to get uncovered with fuel like in the Holleys because they're screwed into the bottom on the casting, not horizontally into the metering block. Some use special notched floats and extention tubes to move the jets into the fuel bowl because the fuel can slosh to the back on acceleration and uncover the secondary jets, and to the front on the primaries uncovering those. That's another $50 for 2 special floats and jet extentions to cure a problem the ED carb is immune to.

And it never hurts to pull the top off and check the float level before installing a new ED carb on a motor. You'll be checking that with any Holley type carb anyway after it's running. That's always fun time as the gas sprays out from under the adjustment nuts in every direction. 

[black71]

hmmmmm hehe that was really fun readin you two go back and forth!   so not sayin  that i am but if i was leanin towards a holley carb, would it be beneficial to be lookin at a proform carb to start with or just an 850 and later upgrade with proform parts?

[black71]

....and a holley street dom is a good intake right? gettin ready to 

[MEK-Dangerfield]

hmmmmm hehe that was really fun readin you two go back and forth!   so not sayin  that i am but if i was leanin towards a holley carb, would it be beneficial to be lookin at a proform carb to start with or just an 850 and later upgrade with proform parts?

If you are looking at an 850, then go with Proform. Buying a Holley and updating/upgrading with Proform parts would cost waaaay too much in the end. Yes, the Hollet Street Dominator is a good intake.   


  Mike

[71chally416]

The Holley Intake is fine. I've been searching for some articles on the new Thunder 800 AVS but it's such a new design their really isn't much out there yet. I know my own experience with the similar EPS800, but I'm sure the AVS is better. I did stumble on this one. It was an A-B comparison with the OEM AVS carb and the Thunder carb was 35hp better just bolting it on which would seem to verify my contention that the new stuff is miles ahead of the old stuff. Just having to tweak the metering rods after cam/header/intake changes also confirms it's jetting is in the ballpark for a modified engine and not lean. That takes about 3 minutes to do if you have a little manual dexterity. And you are nowhere near the fuel like you are with a Holley that you have to remove the fuel line, bowls and metering blocks to change jets in. For what it's worth. 
http://www.compcams.com/Community/Articles/Details.asp?ID=-738676943

[black71]

thanks guys i sure do appreciate all your input!..looks like i'm gonna be biddin on that intake! MEK thanks for the direction with proform and 71chally thanks for your swaying argument for the edelbrock...hehe i do belive Vic Edelbrock Jr sure could use your help in advertising!....do i want mechanical or vacuum secondaries?

[71chally416]

I've spent a good deal of my life making love to Holley carbs. They can be some great fuel metering devices if they're really setup right, but that's beyond the scope of most people. Some like the experts at Pro Systems have the equipment necessary to take one to another level and atomize the fuel the proper way but not everyone wants to spring for one of their custom wet-flowed carbs. You can actually look inside while the motor runs and see how superior the atomization is on their carbs to other carbs.

I'm figuring you just wanna bolt something on that works and you'll have other things to worry about besides air bleeds and pump cams and squirters and jets and 4 corner idle adjustments and float settings, but the carb is totally your choice dude. If you want mechanical secondaries, like a double pumper Holley just realise it's gonna be a gas suckin fool. It'll dump gas from two pumps whenever you jump on it, and that covers up a whole lotta carb metering ills. Jam the throttle bores open and dump a bunch of fuel (often poorly atomized) in from the two squirters until it can draw fuel from the boosters and it'll go without stumbling for sure. You'll pass anything on the road but a gas station with one of those. IMO a vac secondary carb that transitions well between low/high speed circuits is a better fuel metering device and it will always get superior mileage than one with dual accelerator pumps. That's a no brainer. The Demon carb I have now is a hell of a lot nicer than any Holley I've owned. Has the quick change secondary spring, 4 corner idle and a nice thick baseplate that looks impossible to break (another problem with the generic Holley design is it's weak baseplate ears) It even has site glasses on the fuel bowls, and it looks terrific. They are generally cheaper than the equivalent Holley, so that's another option. It's up to you. Any of them will do the job. Just get one around 800/850cfm and don't buy somebody elses problems with a used one that's been abused or altered.

[Chryco Psycho]

If you are looking at an 850, then go with Proform. Buying a Holley and updating/upgrading with Proform parts would cost waaaay too much in the end. Yes, the Hollet Street Dominator is a good intake.   


  Mike

 you can get a new SD for $240 or less , Proform should be $600 

[71chally416]

$600??  If you're gonna consider spending that much for a carb you might wanna look one of these over. Check out their winners list.
http://www.prosys12.macwebsitebuilder.com/proseries4150.html

[Chryco Psycho]

http://cgi.ebay.com/ebaymotors/PROFORM-Race-Series-Carburetor-850-CFM-Drag-Racing_W0QQitemZ370018603937QQcmdZViewItem
so what is the advantage of the Pro sreies
 bottom line is both types of carbs have some advantages , I just prefer the Holley style for tunability  & I won`t use a demon