AVS 2 800 401 FE Build

[390rpm]

We grabbed an Edelbrock AVS 2 800 carburetor while at Summit Racing earlier. My dad wasn't too thrilled with the idea (he's worried it'll look too Mopar for him), but I reasoned that it probably has plenty of flow, has front annular boosters which may help low rpm performance without sacrificing too much top end, and it was only $379.00. I could be totally wrong, but I figure 800 cfm is still too much for a 400 inch FE with a sub 240 @ 0.050" duration single pattern cam. I doubt it'll flow those numbers with the two annular boosters and the air valve secondary, so maybe it won't be too over carbed with a tune up kit. My brother really likes these carburetors, so I guess we'll try one out. We can always just get another Holley if it isn't all that great. What do you guys think of them?

[chilly460]

Really depends how good the heads/intake are, even a sub 240* 390 could make ~500hp if it has a really good topend, which could use all the flow that carb would give. 

Any decent 390 seems to be able to use a 750cfm Holley just fine, doubt that 800 Edelbrock is too big.  I run a plain old 4779 750dp in my Merc, it runs fine on top of my 390 with a 224* cam, and handles lugging 1800rpm in Overdrive just fine.  The Edelbrocks have great throttle response from what I've seen, had a few of them on mild combos over the years. 

[My427stang]

A customer came in with a 800 Thunder series AVS, Edelbrock heads/RPM intake, and the small Thumpr cam.  It was in a truck 390 with no compression and they couldn't get it running well.

It wasn't the carbs fault, multiple sloppy work issues, and the shp had charged him dearly.  Although the cam and compression made it very soft on the bottom, the 800 ran nicely.  I am a Holley guy typically, but he had it and it worked nicely.

[blykins]

I think most guys under-carb engines.  A 780-800 cfm carburetor is, IMO, the perfect size for a lot of FE's, even 400 inch ones.

With that being said, I'm not really an Edelbrock guy, I'm a Holley/Quick Fuel guy, but I don't see any issue with putting that carb on that engine. 

I had a 390 come in last year with a Slayer 600 on it.  I would never run a 600 on a 390, or a 289 for that matter.  It left here with a much bigger carb.

[GerryP]

Unlike the AFB, the AVS has a fully adjustable secondary and they are very easy to tune to a particular engine.  The annular boosters are a big help in getting fuel flowing and make them very easy to use on the street even in large sizes.

[390rpm]

Really depends how good the heads/intake are, even a sub 240* 390 could make ~500hp if it has a really good topend, which could use all the flow that carb would give. 

Any decent 390 seems to be able to use a 750cfm Holley just fine, doubt that 800 Edelbrock is too big.  I run a plain old 4779 750dp in my Merc, it runs fine on top of my 390 with a 224* cam, and handles lugging 1800rpm in Overdrive just fine.  The Edelbrocks have great throttle response from what I've seen, had a few of them on mild combos over the years.

It has ported CJ heads and will run an RPM intake with the RPM cam (236/236 @ 0.050 on a 108) HS 1.76 roller rockers. I'm hoping for around 400 fwhp.

[390rpm]

I'm usually in the Holley camp. The Edelbrocks always looked like they would flow as well as a brick, but I am often wrong. Haha, I feel like I can justify an impulse buy if I say it was to check my biases.

[RustyCrankshaft]

Really depends how good the heads/intake are, even a sub 240* 390 could make ~500hp if it has a really good topend, which could use all the flow that carb would give. 

Any decent 390 seems to be able to use a 750cfm Holley just fine, doubt that 800 Edelbrock is too big.  I run a plain old 4779 750dp in my Merc, it runs fine on top of my 390 with a 224* cam, and handles lugging 1800rpm in Overdrive just fine.  The Edelbrocks have great throttle response from what I've seen, had a few of them on mild combos over the years.

It has ported CJ heads and will run an RPM intake with the RPM cam (236/236 @ 0.050 on a 108) HS 1.76 roller rockers. I'm hoping for around 400 fwhp.

What kind of transaxle are you running to survive a 400 fwhp FE?

Edelbrocks are not the greatest as a performance carb, but I think they work fine on street stuff, trucks, etc. They solidly hold a tuneup and are somewhat insensitive to changes (which is why they aren't good race carbs but work well on a street car when it's 2*F and snowing or 110*F with the AC on).

Besides, they seem to just grow in the shadowy corners of the shop and multiply. I've NEVER bought a Edelbrock/AFB but have a bunch of them LoL

[GerryP]

Flywheel Horsepower -FWHP.  It would be WHP if it was wheel horsepower.  I suppose some make a distinction on what wheels are turning, but it's not necessary.

And a THM425 used in the Toronado and Eldorado would hold that horsepressure.  It did in Tommy Ivo's 4WD dragster.

[390rpm]

Yeah, I meant flywheel horsepower. I like to gauge things by flywheel measurements when I'm just referring to an engine alone. Huge difference in fwhp and rwhp. At least it is with the LT1/LS1 stuff I'm used to fooling with. A 400 gross fwhp LS1 is just a stock engine with headers. With manifolds, they make around 280ish rwhp auto and 300ish with the T56, and run in the high 12 to mid 13 second range at 104-107 mph (in a corvette or F-body), but a 400 rwhp car is capable of high 11's at around 116 mph.  I have a ton of 650 Edelbrock carburetors too. Haha, I can only remember where a couple of them came from. I figure this combo will probably be close to 300 at the tires, fingers crossed. It should pull pretty well.

[wayne]

Edelbrock is a good street also a performance carb used on 413-426-max wedge - hemi- 440 mopar-409-chevy- 421 super duty 401 buick they could have had holley i have holley also but think edelbrock gets a bad rap

[cammerfe]

In regard to transaxles, the Ricardo in the M2K car seems to hold up under the 2500-or-so flywheel horsepower it takes for them to go from zero to 300.4 MPH in one mile. There's also a 900 series Porsche that is running consistently in the eights at about 3500 pounds. That transaxle is the dual clutch unit that seems to be doing well in a number of applications.

They are around, although a bit pricey.

KS

[RustyCrankshaft]

Flywheel Horsepower -FWHP.  It would be WHP if it was wheel horsepower.  I suppose some make a distinction on what wheels are turning, but it's not necessary.

And a THM425 used in the Toronado and Eldorado would hold that horsepressure.  It did in Tommy Ivo's 4WD dragster.

First, it was supposed to be a joke.

2nd, I still have a stack of buildable cores here if you need one! Just pulled another on out of a 72 Eldo. Yes it was red. Yes, I put a set of long horns on the hood to drive it back to the shop to rips it's heart out. But a GM transaxle and 500 caddy will get me thrown off here so I ALLEGEDLY have that stuff! They have issues at higher HP on a street car, but they do work well for what they are.

[RustyCrankshaft]

In regard to transaxles, the Ricardo in the M2K car seems to hold up under the 2500-or-so flywheel horsepower it takes for them to go from zero to 300.4 MPH in one mile. There's also a 900 series Porsche that is running consistently in the eights at about 3500 pounds. That transaxle is the dual clutch unit that seems to be doing well in a number of applications.

They are around, although a bit pricey.

KS

Pricey and most of those don't make a ton of power at the typical FE RPM's.

Not in the same class, but I've broken a few Mendeola's with V8's. Might try an Albins ST6 or something next time. Albins has a few models that seem to be popular in V8 cars in Oz.