63mm TB

[Aurora40]

Man, did he have to shave two of the bolt heads down a lot? That's some serious bores on that thing!

[Zr1 Destroyer]

Originally Posted by Aurora40

Man, did he have to shave two of the bolt heads down a lot? That's some serious bores on that thing!

A little bit, but it took about three minutes with an air cutter! You should here it fire up....it sounds like it's gonna suck the shirt right off yer chest.

[XfireZ51]

Originally Posted by LGAFF

I just checked my car, it has the 415DRM package....


TB measures to 63mm

Intake opening 60mmm???????????????????????


Good catch Dominic! I assumed they would have opened it up since the intake was extrude honed, etc. I'll put that on the list.

LGAFF
92 ZR1
#234

Well make that 2 more holes to port.

[LGAFF]

Chip Foose can restore a car in a week, it takes me 6 months to port
an intake.

16 plenum runners
16 IH runners
8 head ports
2 TB ports

Thats and easy 50 hours of work.

LGAFF
92 ZR1
#234

[bradslt5]

yeah but foose has alot of helpers and free parts too. but he does do a nice job. wonder what he would do with a zr1 ????????????????????????

[LGAFF]

Opened up the left side to 63MM: Big difference, however the are obstructions behind the TB openings.

http://i134.photobucket.com/albums/q...f/DSC02410.jpg

LGAFF
92 ZR1
#234

[Locobob]

Originally Posted by LGAFF

Opened up the left side to 63MM: Big difference, however the are obstructions behind the TB openings.

http://i134.photobucket.com/albums/q...f/DSC02410.jpg

LGAFF
92 ZR1
#234

You can grind a good bit of material off the obstructions - be careful with the coolant passeges though.

[XfireZ51]

LB,

Got any pics of the port job you did on the tb openings?

[lbszr]

Originally Posted by XfireZ51

LB,

Got any pics of the port job you did on the tb openings?

I bought the TB already ported.
This is the ported air horn on a stock TB to show the difference, it's actually almost 1/8 inch that needs to be ported to match, the plenum port looks the same as stock, just bigger.

This just made me realize I have a problem though with the air horn accuired from the site, cause it has no vaccum port in the bottom for the small vaccum line. Any idea's on that?

[Aurora40]

Originally Posted by lbszr

This just made me realize I have a problem though with the air horn accuired from the site, cause it has no vaccum port in the bottom for the small vaccum line. Any idea's on that?

I think only the 1990's had that. I'm pretty sure for '91 the vacuum stuff moved around a bit.