87droptop

Currently have a 87 that i am restoring. I have a E303 cam, longtube header, Sr cold air intake, GT 40 heads and i plan going to a trick flow manifold and a Bama chip... Should i go with a 70 mm throttle body or 75mm??

StalkerGT

I have the trick flow street burner intake and I'm using a bbk 70mm. It does have a 75mm opening. Really no need to go bigger than 70 with your setup

primetime5.0

Bigger is better.

AMWill

A 70mm throttle body will be perfect for this setup. It's even enough to support a decent amount of forced induction down the road if you so choose. I think you'll be very happy with this application on your GT!

Make sure your base timing is set to 10* when installing the Bama chip. I've seen a lot of customers who've upped the base timing before the Mustang was tuned because it ran better, but than used the Bama chip and experienced idling issues. This is because the Bama Team adjust their tune from the base timing of 10*, so it needs to start at that point.

Shane

reldla1996

If this is a 302/306, with those modifications, 70mm is plenty big enough.