Throttle body

[Bandit43]

I have a 2001 Mustang GT convertible 4.6 2V with a stock 70 mm throttle body. I use a digital caliper when I am working on engines. From block deck height, valves, intake or exhaust runners, I measure everything. I have heard many say they have a 65mm. I would check it before I ordered another. Just saying. I hope that this helps someone

 

[Neuron]

You must have a non stock one, below is generally accepted as correct(even according to Ford Promo at the time and numerous Mustang Books.

Stock Mustang Throttle Body Sizes

Year Throttle Body Sizes

From Pages 75 to 76 of the January 2003 issue of MM&FF, here are the TB sizes for the 2V GT:

1996: 65 mm
1997: 65 mm
1998: 65 mm
1999: 66.8 mm
2000: 65 mm
2001: 65 mm
Using a caliper, I measured my 99 GT factory TB bore size to be 68.5 mm. Maybe my measurement was off, but maybe not. The bore might have a taper, and it depends where you measure it. It may actually be 66.8 mm at the butterfly valve. Along similar lines, I measured the bore of my 70mm Accufab TB to be 73 mm.

The '02-'04:65 mm

 

[Bandit43]

Had mine since August 2001. Has not been altered,came with 70mm. Me and my son are rebuilding the engine and he was wanting to put a 70 on it, so we took the caliper and I told him he does not want the same as we have. We are doing some upgrades to the engine from top to bottom. Sorry but that is what mine came with. Don’t know why. It also came with a different exhaust system than a regular GT. Didn’t order it just came like that, maybe some kind of package on it. My intake runners are not the same as a regular PI head. Cams were degrees also. Did it have the 1.7-1.4 valves either. Had to be a different package than what a regular GT Convertible came with. Still trying to figure out why myself.