Carter Thermoquads ~ 'More General Information'
you can tell what Carter did here...the Qjet was the cutting edge of OEM carb technology around 1965. Carter copied, improved it for racing 1969 with the early CS carbs, and changed it to air metered like a Holley. Richer metering for competition, racing. By 1972 the musclecar scene was winding down quickly, so they backpedal the design to what the Qjet was to begin with, and sell it to the OEM's for the next 15+ years. that's where the real money and sales volume was. But this is why most TQ and Qjet carbs can be had under $100 on Ebay all day long- while a real McCoy early CS or 71 340 carb is $500 and up, and the strip kit alone is $475-$500. the air metered carb is the better performer at the track. not to say you can't modify the 72-up carbs to match them- basically what's has to be done with later carbs, is add fuel, take away emulsion/air bleed. richen it up. solid fuel metered is really an emissions designed carb. so were all the Qjets. here's 750 vs. 800cfm Qjet booster, angled upward nozzle, air bleed cluster. there's 6 air bleeds in that cluster, 3 per side. it's a '69 428 Pontiac lid, on a '70 Buick 800cfm center I used, raced since 1985, on 6 different engines. the Qjet did 750/800cfm, Carter took it to 800/850/1000cfm with improved design, added dual feed/floats
you can tell what Carter did here...the Qjet was the cutting edge of OEM carb technology around 1965. Carter copied, improved it for racing 1969 with the early CS carbs, and changed it to air metered like a Holley. Richer metering for competition, racing. By 1972 the musclecar scene was winding down quickly, so they backpedal the design to what the Qjet was to begin with, and sell it to the OEM's for the next 15+ years. that's where the real money and sales volume was. But this is why most TQ and Qjet carbs can be had under $100 on Ebay all day long- while a real McCoy early CS or 71 340 carb is $500 and up, and the strip kit alone is $475-$500. the air metered carb is the better performer at the track. not to say you can't modify the 72-up carbs to match them- basically what's has to be done with later carbs, is add fuel, take away emulsion/air bleed. richen it up. solid fuel metered is really an emissions designed carb. so were all the Qjets. here's 750 vs. 800cfm Qjet booster, angled upward nozzle, air bleed cluster. there's 6 air bleeds in that cluster, 3 per side. it's a '69 428 Pontiac lid, on a '70 Buick 800cfm center I used, raced since 1985, on 6 different engines. the Qjet did 750/800cfm, Carter took it to 800/850/1000cfm with improved design, added dual feed/floats