I've seen a few posts on the subject of changing or porting the 78mm J tube to allow a 90mm throttle body. I'd prefere to buy a J tube replacement but the maguson rep claimed they don't make one for my 112. Could he be wrong or are they only availlable for the larger blowers. thanks. Dan

 

You had to go back a few years to find the DIY threads.

https://www.performancetrucks.net/fo...ght=BigBlackAv

https://www.performancetrucks.net/fo...d.php?t=358691

https://www.performancetrucks.net/fo...d.php?t=391054

I know Magnuson made them for a while, not sure if they still do.

 

Thanks for the info. I've seen these guys posts. I was hoping to here a little something about a 90mm "J" pipe compatible with a 112 mag. Dan

 

West Coast Cylinder heads used to make them also, they are a sponsor on the right. You may be able to call them and see if they still do.

 

West Coast Cylinder Heads (see sponsor list) also used to convert the J-tubes to a 90mm flange.

 

LOL. We must have posted exactly the same time. No wonder the site seemed to hang so long when it was posting.

 

I bought my 90 mm j-tube from west coast as well.

 

they make a j tube for the 112 i just so happen to need a j tube period anyone got one for the 5.3 silvy

 

Some people may still have their original 78mm j-tubes lying around if they purchased the 90mm replacement from Magnuson(when they were making them). I have occasionally seen them for sale in the classified section. You could try placing a WTB ad there.

I think the WCCH 90mm conversion required your 78mm as a core.

 

Last I talked to Richard(6ish months ago) he isnt making them anymore.