Thread: 50.8mm runners Too big??? Results on last page...

I am planing making a custom IM and I will use 50.8mm id runners and velocity stacks and Q45 tb do you guys think it's too much I will be testing it on a stock VE with N1 cams and tri-y header I already have a baseline Dyno of the car with stock IM
Edit The runners are 2.0in so they are actually 50.8mm

Tried to click on to read graph enlarged, no go. What was baseline whp & torque?

looks like 155 HP and 144 TQ, but I just used right click, view image, hold CTRL while scrolling the mouse wheel up, and it'll zoom in the pic. That blurs the pic a bit tho. The HP wasn't too clear. May be 165?

195.99whp & 144wtq

Sorry for the graph I don't have a good camera just cellphone

I think / know 52mm will work very well. There is a graph floating around somewhere of it vs a stock manifold ...

I'm building a 55mm tapered runner for my big motor.

Good that's what I wanted to hear I already have the materials to build it so there its no come back I know it probably will help at the top end maybe after 7,000rpms but I will be installing the 4.78 fd once I get it so that will help staying on the powerband it already have a nice one..

Id just make a little cut on the exit where it meets the flange to taper it down a bit. 52 even crushed down is a little bigger then the flange.

Where did you get your stacks?

(Volviste es tuyo o Lo setiaste) nice numbers

I am planing to use oem flange to cut it before the injectors to use factory fuel rail..
I got ross machinery 2.25 tube and stacks to match the tube wich is 52 mm ID