BBB Sizing.

[intimdatr]

What size are the stock butterfly's, and what is the size that SHOsource bores them out to when they are making a set of BBB's? I was under the impression they are 30 something mm stock and SHOsource bumps them up 40 something mm? Does any have exact numbers on their sizes. Thanks for any info.

Thanks,
David.

 

[yamahaSHO]

38mm and 40mm repectively, IIRC.

 

[SHOstopper1992]

OEM- 38mm
Big Bore Butterflys-40mm
Huge Bore Butterflys- 45mm, all aluminum.

 

[yamahaSHO]

Stock is all aluminum as well.

 

[intimdatr]

Awesome! thanks a bunch for the info guys. :thankyou:

 

[mcrowe3797]

OEM- 38mm
Big Bore Butterflys-40mm
Huge Bore Butterflys- 45mm, all aluminum.

Where do you get the Huge Bore Butterflys- 45mm, all aluminum.

 

[yamahaSHO]

Custom machined and not cost effective.

 

[SHOstopper1992]

Where do you get the Huge Bore Butterflys- 45mm, all aluminum.

Not worth the money, unless its a track car or forced induction.

 

[intimdatr]

Where do you get the Huge Bore Butterflys- 45mm, all aluminum.

At that point its just going to be cheaper and more effective to delete the butterfly's.

 

[yamahaSHO]

Not worth the money, unless its a track car or forced induction.

It'd be more beneficial to put that money towards a custom intake manifold.

At that point its just going to be cheaper and more effective to delete the butterfly's.

That would depend on what you want out of the car as you would lose a good bit of power below 4k RPM.