Holley 1850 replacement carb

impstocker · 02-13-2016, 06:35 PM

Putting together my 396/325 BBC for my 1965 Impala. I want to run the Holley carb which came on the 1965-66 396/325 (also with Quadrajet.)

Wouldn't I be able to use aoff the shelf Holley 1850 600 CFM carb? Same Throttle bore diameters and Venturi size as a original Holley.

Would I need to ask NHRA if they would add it as a replacement carb? Has anybody ever tried this?

FireSale · 02-13-2016, 08:42 PM

That's a trick question. There isn't a listed replacement on the NHRA site for that carb. The Holley part number for the one you want to use is 0-1850 and the first paragraph of the replacement carb section of the Accepted Products document reads in part "Holley dash numbers are accepted unless otherwise noted".

Talk to Quick Fuel. They have a long list of carbs that NHRA has approved as replacements and never added to their documents.

There's no listed replacement for the Holley listed on my SBF, but QF has the SSR 585 listed on their documents as an approved replacement. More cash, which I'm out of, but nice carb.

Dale

danoone · 02-14-2016, 06:57 AM

I have a 66 396 Q jet core

Adger Smith · 02-14-2016, 04:13 PM

Tried to send you a private message. Says your full. Clear it and I will send you some info. Or e-mail me...I can't get the format to post here.

stocker396 · 02-14-2016, 05:02 PM

I personally took and 1850 side by side with a 3140 (the #'s correct for my 66 396) to Pomona last year and Bruce B said No Problem its OK!. You can PM me for details on this app. I already have Dyno'd this carb on a 396/325 back to back with a 3140. Also talk to Scooter Vester at Quick Fuel. He has a approved carb as well.

Dave Gantz · 02-15-2016, 08:05 AM

Quote:

Originally Posted by impstocker

I want to run the Holley carb which came on the 1965-66 396/325 (also with Quadrajet.)

I'm not familiar with this at all. Could you tell me; isn't the Quadrajet bigger?

Jason · 02-15-2016, 10:13 AM

Quote:

Originally Posted by stocker396

I personally took and 1850 side by side with a 3140 (the #'s correct for my 66 396) to Pomona last year and Bruce B said No Problem its OK!. You can PM me for details on this app. I already have Dyno'd this carb on a 396/325 back to back with a 3140. Also talk to Scooter Vester at Quick Fuel. He has a approved carb as well.

Since when does a center pivot dual line Holley get to replace a square bowl single line Holley? Your photo is questionable if that is the 1850 replacement.

stocker396 · 02-16-2016, 12:56 PM

Yes the Quadrajet is Bigger BUT it has its issues.Bigger does not always mean better. Holley is easier to tune.
As for the Holley, We have run it in several versions. Changing the bowls and metering plates is legal as far as I have been informed. The unit on the engine was the one looked at by tech.We ran in 5 carbs that day on the dyno. If for some reason someone wants to protest it changing it only takes minutes. It is just easier to tune this way. I have multiple carbs in different configurations- Centerhung dual block,Center hung 1 block 1 jet plate, Side hung transfer with jet plate. The thing was to get a tuneable secondary and adjustable floats. After all is said and done it is still 1562 x 1562 /1250 x 1313 and says either 3140 or 1850 the rest just bolts up no different than jetting, the main body is untouched and still legal. I have seen ALOT worse go through tech. Besides the Quick Fuel is legal too, Have you seen that?! It looks 10x better than the swapmeet/ebay stuff we are playing with.

Dave Gantz · 02-16-2016, 02:30 PM

Quote:

Originally Posted by stocker396

Yes the Quadrajet is Bigger BUT it has its issues.Bigger does not always mean better. Holley is easier to tune.

I understand the easier to tune aspect, but isn't the Q-jet 750 cfm? Seems like a lot to give up. Maybe I'm thinking of a Thermoquad...

5389stk · 02-16-2016, 02:35 PM

dyno tested holley intake 6948, vs 3948 q-jet intake same 750 holley carb on both intakes . 6948 holley intake down 20 horsepower on 425 horse 454, steve

02-13-2016, 06:35 PM	#1
impstocker Member Join Date: Dec 2008 Location: Wingdale, NY Posts: 302 Likes: 27 Liked 53 Times in 16 Posts	Holley 1850 replacement carb Putting together my 396/325 BBC for my 1965 Impala. I want to run the Holley carb which came on the 1965-66 396/325 (also with Quadrajet.) Wouldn't I be able to use aoff the shelf Holley 1850 600 CFM carb? Same Throttle bore diameters and Venturi size as a original Holley. Would I need to ask NHRA if they would add it as a replacement carb? Has anybody ever tried this?

02-13-2016, 08:42 PM	#2
FireSale VIP Member Join Date: Feb 2014 Location: Lakewood Washington Posts: 1,407 Likes: 29 Liked 237 Times in 126 Posts	Re: Holley 1850 replacement carb That's a trick question. There isn't a listed replacement on the NHRA site for that carb. The Holley part number for the one you want to use is 0-1850 and the first paragraph of the replacement carb section of the Accepted Products document reads in part "Holley dash numbers are accepted unless otherwise noted". Talk to Quick Fuel. They have a long list of carbs that NHRA has approved as replacements and never added to their documents. There's no listed replacement for the Holley listed on my SBF, but QF has the SSR 585 listed on their documents as an approved replacement. More cash, which I'm out of, but nice carb. Dale __________________ Dale Shearon 68 Mustang 6394

02-14-2016, 06:57 AM	#3
danoone Junior Member Join Date: Oct 2015 Posts: 66 Likes: 0 Liked 0 Times in 0 Posts	Re: Holley 1850 replacement carb I have a 66 396 Q jet core

02-14-2016, 04:13 PM	#4
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Holley 1850 replacement carb Tried to send you a private message. Says your full. Clear it and I will send you some info. Or e-mail me...I can't get the format to post here. __________________ Adger Smith (Former SS)

02-14-2016, 05:02 PM	#5
stocker396 Member Join Date: Dec 2013 Location: Santa Fe TEXAS Posts: 109 Likes: 2 Liked 58 Times in 16 Posts	Re: Holley 1850 replacement carb I personally took and 1850 side by side with a 3140 (the #'s correct for my 66 396) to Pomona last year and Bruce B said No Problem its OK!. You can PM me for details on this app. I already have Dyno'd this carb on a 396/325 back to back with a 3140. Also talk to Scooter Vester at Quick Fuel. He has a approved carb as well. Attached Thumbnails __________________ Overkill is Under-rated

02-16-2016, 12:56 PM	#8
stocker396 Member Join Date: Dec 2013 Location: Santa Fe TEXAS Posts: 109 Likes: 2 Liked 58 Times in 16 Posts	Re: Holley 1850 replacement carb Yes the Quadrajet is Bigger BUT it has its issues.Bigger does not always mean better. Holley is easier to tune. As for the Holley, We have run it in several versions. Changing the bowls and metering plates is legal as far as I have been informed. The unit on the engine was the one looked at by tech.We ran in 5 carbs that day on the dyno. If for some reason someone wants to protest it changing it only takes minutes. It is just easier to tune this way. I have multiple carbs in different configurations- Centerhung dual block,Center hung 1 block 1 jet plate, Side hung transfer with jet plate. The thing was to get a tuneable secondary and adjustable floats. After all is said and done it is still 1562 x 1562 /1250 x 1313 and says either 3140 or 1850 the rest just bolts up no different than jetting, the main body is untouched and still legal. I have seen ALOT worse go through tech. Besides the Quick Fuel is legal too, Have you seen that?! It looks 10x better than the swapmeet/ebay stuff we are playing with. __________________ Overkill is Under-rated Last edited by stocker396; 02-16-2016 at 01:02 PM.

02-16-2016, 02:35 PM	#10
5389stk Junior Member Join Date: Aug 2013 Posts: 29 Likes: 0 Liked 72 Times in 6 Posts	Re: Holley 1850 replacement carb dyno tested holley intake 6948, vs 3948 q-jet intake same 750 holley carb on both intakes . 6948 holley intake down 20 horsepower on 425 horse 454, steve