Holley 4BBl Performance

[PERPETUALROAD]

Was there a dyno compare between BSR vs AZC manifold? I have a BSR and am curious is all. I will be following you and or this thread.

perpetualroad.com

[porkbun]

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, 2015 by porkbun