The preferred carburetor of classiczcars and S30's all over the world!

Ive run used SU's and ZTherapy SU's but they have never come close to the level of performance that my car was on when it had the 4bbl on it (when I first got the car). Ive got a close ratio 5sp, cam, clifford header, and a Crane XR700 ignition so it was pretty fast with the SU's but the 390cfm takes it to another level. Lightning fast startups with the electric choke is the cherry on top since this is a NE car and my daily driver(and only car!). I have the cartech adapter bolted onto the SU manifold but I have a BSR manifold on the way which should be a more permanent setup.

Definitely not the fastest it couldve been since Im new to Holleys and my tune is nowhere near perfect, the tires were spinning through ~30mph and I shifted late but it does show the Holley is certainly no slouch! 0-60 was in ~6.4 seconds and I plan on being well into the 5's once my manifold arrives and I take another video(hopefully!)

No actual dyno, All my results have been from my butt dyno. BSR works and works alright but the opening on the sides is probably around the same size as one of the 4bbl butterflies. An SU butterfly dwarfs it and one of those openings is feeding 3 cylinders. The AZC has wider openings and it is very apparent. The taller divider makes way more low down torque and I believe the wider openings are to blame for it pulling harder than the BSR from any spot (same carb setup). 
 

My Rankings:

1. Azc manifold

2. Adapter with divider
3. Tie: Cartech adapter

4. Bsr manifold

 

EDIT: Currently running a set of Roundtops with SM needles and the all around performance is VERY close. Fuel economy acceleration seem about the same as the AZC manifold but again thats just a butt dyno and no concrete evidence. ITBs in the spring hopefully!

Edited January 25, 201510 yr by porkbun