Mikado463

Thinking about replacing my '4160' non-choke (don't ask me why the previous owner took it off) with a new ele. choke model. I'm leaning towards a Holley Ultra Street Avenger (billet base plate and metering blocks) but discussion this morning @ 'cars and coffee' has me wondering about the Quick Fuel alternative - 'SS'

The other concern is the fact that I do not know the internals of my '427' (a look inside my oil fill hole does reveal roller rockers FWIW) I'm wondering what cfm ........670-750 ??

Thoughts ..........

warrenmj

I switched over to a Quickfuel a couple years ago and my '66 L79 has run great ever since. You can find numerous web sites to calculate the CFM needed for your engine. Here is one - http://documents.holley.com/techlibr...carburetor.pdf

Mikado463

Warren, which model Quick Fuel did you get ?

warrenmj

QF model BD-1957 - Black Diamond 600 CFM. My engine is a stock L79 327/350 HP

Pop Chevy

Never needed a choke, just gave it a couple pumps always fires right up. I do like the Quickfuel carbs . Fellow down the road had one on his Late Model and I helped him tune it. Big block would need a 750 at least, depending on the mods.

Mossy66

I believe the carb on the '66 L72 was 780 cfm. If you take your 427 up to the L72's 6500RPM redline often, or have a better breathing intake or exhaust, you should probably have a carb that flows at least that or more.


Gerry

Canuck62

I also have the Quick Fuel ,,, Slayer Series 600 CFM
They are very easy to fine tune,,, especially for me using the step by step instruction on their website

https://www.quickfueltechnology.com/...rb-tuning-tips

Frankie the Fink

The problems with the formula is that you have to know the VE of your engine (Volumetric Efficiency) and that can be a very squishy number and it sounds like you have a 'built' motor. My SWAG would be a 750cfm. I ran a Quick Fuel on '67 Chevelle 396 and they are very nice carbs. If you call them and talk to "Scooter" he will tell you what you need. Your big decision will prob on vacuum or mechanical secondaries...

DansYellow66

FWIW to anyone I do like a working choke and fast idle on my cars. My 66 BB is very much a non-stock motor with 12:1 pistons - but open chamber L88 heads, L88 milled plenum divided intake, 256/266/.600 cam and a Holley-restored 3247 (with choke).

I took it out yesterday in low 40 degree weather. Filled the front fuel bowl through the vent until fuel barely dripped out into the primaries. Pumped the throttle once, hit the key, fired immediately and set into a somewhat lumpy - but steady idle of about 1300 rpm and that was that. I got out and let it idle for about 5 minutes before taking off (it still doesn't like to go until some heat gets built into the aluminum intake).

To me that's pretty impressive. Back in the day it was pretty hard to get the average, barely in tune 396/325 to start up on a cold morning and run without dying once or twice.

I think one of the nice things about the Quick Fuel carbs is that I understand they have replaceable air bleeds and it's fairly easy to fine tune the transition circuit which is usually sort of a compromise in most off-the-shelf Holleys and takes a lot more effort to modify.

Frankie the Fink

That is true and a phone call and a description of an individual application will generally result in a suggestion as to which air bleeds to try out. That's what happened on my Chevelle. Its a two minute job to swap them out...

MarkC

Holley has bought Quickfuel and all the QF employees are gone. I spent 3 hours on hold waiting for service on the Holley line that is now on the QF website. I even called Summitt and their tech couldn't get a body on the phone.

I highly recommend an AED carb. They are in Richmond , VA. They build their carbs using Holley unmachined parts and they will set them up for your engine. Check out the website or call them. They are very helpful and nice to deal with.

MarkC

Here is a picture of my new 650 with no choke. The carb was perfect right out of the box. The throttle response is much better than the old 3367. The rubber gas line has now been replaced. I have done about 6 cold starts with this carb. It starts after one pump and after 20-30 seconds it is fine. This is in a heated garage.

Frankie the Fink

Didn't know that, "Circle of Life" I guess. QF was supposedly started by a bunch of ex-Holley employees and I guess they cashed in and sold the biz back to the "mother" company.

Too bad the service turned to crap now....

MarkC

I tried to buy a QF but the service at Holley is terrible. I found out about AED through the C3 forum. I drove up to Richmond and bought the carb after a saw it run on one of their test engines.

Mikado463

Thanks for the info Gents, Mark I've sent you a PM


Dave

warrenmj

I hadn't heard that. Too bad as QF had great customer service.

Mikado463

Thanks to the nice chat I had with 'MarkC' last weekend I contacted the folks @ AED. Good folks to discuss all thing carburetors .............good chance I'll be buying one of their 750's this winter.

ILBMF

I recently bought a Quickfuel 780 for the '66. I bought it from a place in the mid west where they customize it for your application free of charge. The guy needed to know which heads, intake, cam, compression ratio, transmission, etc. The carb came with a build sheet and job number and it runs flawlessly. PM me if you want the phone number.