quady's are too unreliable on most cars they run good for a bit then ***K up, where as a holley never seems to give much trouble, holley's are easy to tune and keep tuned, id have a holley over a dirty old quady any day... for a 253 a 465 four barrel would be perfect, or a 350 holley if ya had a two barrel mainfold... people think quady's are the go but they forget the cfm difference when they compare them to a holley.... most quady's are about 780 cfm and alot of people compare them too a 600 holey which is different cfm... but at the end of the day its what you feel is better, everyone has their own opinions on both...

Quote: Originally Posted by currptvn quady's are too unreliable on most cars they run good for a bit then ***K up, where as a holley never seems to give much trouble, holley's are easy to tune and keep tuned, id have a holley over a dirty old quady any day... for a 253 a 465 four barrel would be perfect, or a 350 holley if ya had a two barrel mainfold... people think quady's are the go but they forget the cfm difference when they compare them to a holley.... most quady's are about 780 cfm and alot of people compare them too a 600 holey which is different cfm... but at the end of the day its what you feel is better, everyone has their own opinions on both... Quaddies are only unreliable if you dont do maintenance on them. See people get this perception that becasue they came out stock that they are rubbish or hard to maintain because every second car has had one on it for 15years and had absolutely no maintenance what so ever. No it all depends on weather your going a double pumper or vac secondary. Its all an if and buts equation, single plain or dual plain manifold a double pumper maybe a better choice on a larger CI single plane or tunnel ram motor but a quaddie set up right will give a better mixture and is more efficient for what its doing on a every day street car.

agreed everyday street car quady may be the **** but not if u want a street strip car, double pumper all the they on a street stripper, i have had a couple of good quady's that only had a slight flat spot of the line, i found die grinding the bowl out and cutting the float in half, to hold more fuel the best way to get them going on a very healthy 308 or 355. But still dont like the way there set up with the big guts full of air they give ur motor when the secondary's kick in then the top butterfly's have to open then you get ur fuel major flat spot. In other words on a dyno you may get more power out of them than a holley but that power dont meen **** when u line up beside a car that doesn't have a flat spot. It can cost u time at the strip.

ok, i've built the motor, its a 253 (smaller but it revs harder!!) fair bit of port work now, edlebrock torker singleplain manifold, #2 crowcam for mid power, all new bearings,rings(basic freshin up), i run a #2 shift kit in my tri with a huge sprag bearing fitted and a borgwarner 3.45 lsd out of a vl. i ran it in with the quady for about 1200ks, i've now got the 600 holley on it to try, its a vac secondrys type, so far i've always had a flat spot off idle when i punch it at the lights with the quad, (and sometimes stall the c*#t) but this 600 halls a$$ off the mark, i've lost abit of rev at about 4500 to 5000 but the feel from idle to 4500 is so crisp and revy, very sharp and its still usein about the same amount of fuel, the verdict... i think it'll stay on for a while!