spdygon

iTrader: (1)

if our stock Tb are 75mm , what would be the size after porting them ?
and can a BBK 80MM be ported, what size will end up as?

PowerShift408

iTrader: (44)

Stock is 78mm. When ported, the inlet size is not increased. If you feel in your throttle body, you will feel a distinct ridge. Removing that is the focal point of porting the throttle body.

spdygon

iTrader: (1)

my bad 78 it is.
i had some one tell me that porting the stock Tb would be better then a 80mm or 85mm BBK.

PowerShift408

iTrader: (44)

You'll get all the performance for a fraction of the cost. The stock intake inlet is 78 mm, so having a throttle body bigger than that will not do you any good.

02_Z28_G

iTrader: (5)

so by porting a throttle body your basically creating a smoother airflow correct?

PowerShift408

iTrader: (44)

Yes sir.

orangeapeel

iTrader: (18)

Moving to external.

Bo White

iTrader: (59)

Stock TB is 75mm but porting them makes it a true 75mm. Stock has a ridge infront of the blade that hinders flow.

MonmouthCtyLS7

iTrader: (6)

Inlet size is still bigger from the aftermarket TB hence more air flow. Not a huge differance but still more. Porting the stocker is definately cheaper. Ive had both but also swapped a intake so i couldnt tell u the differance if any.