How can you tell the difference between a 84 mm and 74 mm throttle body part number? I typed the a113 number in on eBay and hardly any of the throttle bodies say they are a 74 mm.

 

Simple, they have different part numbers.

 

According to eBay they are the same that's why I ask

 

According to eBay they are the same
that's why I ask

The part # I put in was a1131410125

 

That is the 74mm TB.
They have different part numbers the other part is 112 141 01 25 and that is the part that came on the NA Crossfire from the factory.

 

I'm looking for aftermarket parts to put on my xfire. I have 74 mm already, but what about this!!!!

BBK Performance 1784 Performance Throttle Body Camaro Corvette SSR Trailblazer | eBay

 

Very confusing eBay.
They show a throttle body that could never work, list Crossfire as compatible, but in the text portion all they talk about is a MAF sensor.
That throttle body is a cable operated one, not a drive-by-wire as we have.

 

Not to mention.. I'm guessing that is a larger bore.. now check the bore on the intake manifold ... get the picture?

 

I was looking for the knowledge to share. It's so much easier when you guys do the thinking for us.

 

LOL.. we're at the end of the rope at 74mm unless you want to get into some serious machining work..