20v throttle differences

[Anthony13]

Hey all I have a 16v bigport 4age and I'll eventually be putting cams and ITBs on it I've already got a set of silver top ITBs and an emanage for it and I no I need an adaptor bracket for them to fit my 16v but I was wondering what are the differences between the black top and silver top ITBs because I've read that they are slightly different in some way?

[Jimmee1990]

Silvertop throttles are a bit smaller diameter than blacktop.

[Anthony13]

Oh cool thanks

[s13 james]

i think,silver top are 42 mm and blacktop are 45 mm

[Sam-Q]

James is right, the blacktop throttles also have a kidney shape out the back of them. You would likely loose power fitting them instead of the silver to your engine.