Quick Fuel Carb

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   I am thinking of dumping my Holley 670 SA and going to a Quick Fuel HR-680-VS. I found a good deal on one.
Anyone have any experience with these carbs? They have decent reviews on Summit.

https://www.summitracing.com/parts/qft-hr-680-vs/reviews

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
72FordGTS Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group GTS.org Admin Joined: 06-September-2005 Location: Ontario, Canada Status: Offline Points: 6780	Post Options Post Reply Quote 72FordGTS Report Post Thanks(0) Quote Reply Topic: Quick Fuel Carb Posted: 14-March-2024 at 8:51AM
	I am thinking of dumping my Holley 670 SA and going to a Quick Fuel HR-680-VS. I found a good deal on one. Anyone have any experience with these carbs? They have decent reviews on Summit. https://www.summitracing.com/parts/qft-hr-680-vs/reviews
	Vince 1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin

aquartlow Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19-December-2011 Location: Summerfield, Fl Status: Offline Points: 2341	Post Options Post Reply Quote aquartlow Report Post Thanks(0) Quote Reply Posted: 14-March-2024 at 12:22PM
	Hey Vince, I haven't tried a Quick Fuel carb yet, supposed to be an upgrade over a Holley, but who knows. I do know the Holley Sa's are usually too lean just off idle-the idle feed restrictor in the primary metering block usually needs upsized about .001-.003" another issue is the vacuum tube needs to be installed in the primaries for correct activation of the vacuum secondaries. Here's a pic of said tube: Sometimes Holley omitted these for some unknown reason, leaving only a hole in the venturi wall, without the tube the secondaries will not fully open or sometimes not open at all. Easy to fix but requires apiece of 1/8" brass tube and an appropriate drill bit. Hope this helps. sorry for the large image.
	www.supermotors.net/22468 Yeah, It's a Hybrid...It burns gas and tires. No matter how good she looks, somebody, somewhere, is tired of her sh*t. Beauty is skin deep, ugliness goes clear to the bone.

72FordGTS Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group GTS.org Admin Joined: 06-September-2005 Location: Ontario, Canada Status: Offline Points: 6780	Post Options Post Reply Quote 72FordGTS Report Post Thanks(0) Quote Reply Posted: 15-March-2024 at 12:28AM
	Thanks Todd. I only run a 670SA (I think you have the bigger 770 based on a 750 carb?) which has the main body and metering blocks from the classic 600. I have the carb tuned well with an AFR, but it just never seemed as crisp and responsive as I wanted. I found the a local vendor selling the QF for a great deal, so I figured maybe I should give it a shot and I can sell my SA and get most of my money back. It apparently has better metering blocks, downleg boosters, replaceable airbleeds, and I think might be a better match for my engine. I may give it shot and try it out, just wanted to see if anyone else has run one here.
	Vince 1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin