kornerz

iTrader: (5)

i went to the swapmeet this morning and got my self a weiand intake manifold. One small issue with it, the throttle body flange was cut off and it had a small s tube tack welded to it. It looks like they did it for clearance. So i cut the tacks and pulled the s tube off. Now i have the manifold and flange. My question, would i gain any low end tq if i would add a 2" tube in between the throttle flange and manifold? if its a waste of time ill just get it welded back to the original spot. Any input would be great.

garygnu

weld the stock flange back on,a smaller tube would restrict air flow killing power.

Pocket

iTrader: (22)

Think he means a 2" length of tubing, not diameter

You wont notice any different by adding a little tube. 25.1ci of plenum volume is minor. Throttle body spacers dont work for port injected manifolds like they did for TBI/carb apps. It would however be a great place to install nitrous bars and related

LS1-450

iTrader: (33)

Agreed, weld it back on, no tube extension. If you want to improve its' performance open it up to a larger intake diameter. I think I remember that mine was able to be opened up to as much as 88mm. It was a few years ago, but, think that's correct. It will reduce the pressure drop into the plenum @ high RPM WOT. This will improve peak HP & under curve HP & TQ. I realize that the question was related specifically to torque & the torque idea wasn't gonna work out. So, thought an increased HP mod may be helpful. I have measured the gains in airflow & manifold pressure before & after the increase in inlet size. It is a worthy mod.

Irish350

iTrader: (14)

word, i think itd be good opening out the tb, and if you have some $ have it ported (but garage-port-jobs arent worth it)