Carter Thermoquads ~ 'More General Information'

interesting shootout results last year,
from the Don Terrill forum message board

Thermoquad vs. Qjet vs. Holley on a 482cid big block Buick:

Dyno test results - Holley vs Thermoquad vs Quadrajet - Don Terrill’s Speed-Talk

Dyno test results - Holley vs Thermoquad vs Quadrajet
Post by 70GS455 » Thu Feb 04, 2021 12:18 pm

So i got some semi final dyno results from my 482 BBB. Its semi final because we didnt finish, a mechanical failure prevented me from testing one last carb. But will finish in the coming spring. To recap and clarify, used a 950 Holley Ultra HP 0-80805, an Everyday Performance prepped Stage 2 800 cfm Qjet and a "950" Thermoquad, modified by Steve Stills and final tuned by me. The Tquad is called "950" (by me) for lack of any better label. It started out life as an OEM 6322 production 850 with 1.5" pri butterflies, but the primaries were modified by removing the stock 1.186" bowl venturis, opening them up to almost 1.4" and removing one booster ring (the idea is to get close to a 1000 CS Tquad using the more available fuel-metered cores)

All 3 were without any air cleaner base or air turbine, choke flap hardware was removed.
This was with a dual plane manifold. I am definitely intake challenged as manifold vacuum was over 2" with both spreadbores.

Holley 595 hp, 622 ft lb
Tquad 590 hp, 608 ft lb
Qjet 586 hp, 609 ft lb