🔧 Technical 4th gen F-body drag wheel fitment

[IZZy]

I know the subject has been beaten to death and I did a bunch of research on this on LS1tech but still couldn’t find a definitive answer, I saw Pro Stock John posts on there a lot, hoping he can help here too.

My specific question is about billet specialties 15” front fitment with LT1 brakes.

There is a couple of options for size and backspacing:

15x3.5 with 1.75 backspacing
15x4 with 1.625 or 2.25 backspacing

Most of what I found is about LS1 brakes and how some people needed a spacer and no grinding, some needed both.

anybody know which of these options works better?

Izzy

Click to read more...

 

[Pro Stock John]

So the car has 1993-1997 4th gen LT1 brakes? I can ask someone I know.

 

[Mook]

daturbosix, this seemsole something you might know? Maybe?

 

[IZZy]

So the car has 1993-1997 4th gen LT1 brakes? I can ask someone I know.

It’s my 95 Z28 that I’m trying to put these on, thanks!

 

[daturbosix]

daturbosix, this seemsole something you might know? Maybe?

We always ran 1.75 bs on a 3.5 front.

I have a picture of my formula somewhere.. I'll find it in the morning

Oh, and it took me two days to grind the fuck out of my calipers

 

[IZZy]

We always ran 1.75 bs on a 3.5 front.

I have a picture of my formula somewhere.. I'll find it in the morning

Oh, and it took me two days to grind the fuck out of my calipers

See that’s what I don’t want to do lol

 

[daturbosix]

See that’s what I don’t want to do lol

It ain't that bad. I'd do it again.
Plus mine was an 01.. bigger brakes I think. So yours has less grinding needed.

 

[Pro Stock John]

I asked my contact, she's checking.

 

[IZZy]

I asked my contact, she's checking.

Thank you!

 

[daturbosix]

 

[daturbosix]

but i liked this look better.

 

[IZZy]

This is what I’m thinking

 

[Lead Pipe]

Buy 17" fronts /thread

 

[IZZy]

Buy 17" fronts /thread

I hate how 17”s look in a drag wheel, just personal preference.

 

[daturbosix]

I hate how 17”s look in a drag wheel, just personal preference.

samesies

 

[Lead Pipe]

We’ll agree to disagree.

 

[IZZy]

Eewww yes agree to disagree lol

 

[Bob Kazamakis]

The LT1 cars only have 11” rotors and single piston front calipers. I doubt any grinding has to happen. LS1 cars are dual piston 12”.

looks like you need a 5/16” spacer to clear spokes but no other issues.

Wheel & Tire FAQ - Drag Wheels - CamaroZ28.Com Message Board

Wheels and Tires - Wheel & Tire FAQ - Drag Wheels - In order to make the FAQ topics easier to find, I've pulled out the drag wheel posts, into their own thread. So far we have info on: -Weld Pro-Star (DragLites are similar) -Bogart -Weld Aluma-Star 2.0 If you have specific info on size, offset...

www.camaroz28.com

 

[Pro Stock John]

I have not heard back from her yet.

For Welds we used to run a spacer yes.

I'm thinking you don't need them for Billet Specialties, but I never ran those on any of my cars.

 

[Aron]

Billet Speciaties are made specific for 4th Gen F cars and shouldn't require any spacers with stock brakes. No need to grind the rear calipers either.

 

[Aron]

Store

www.billetspecialties.com

 

[IZZy]

The LT1 cars only have 11” rotors and single piston front calipers. I doubt any grinding has to happen. LS1 cars are dual piston 12”.

looks like you need a 5/16” spacer to clear spokes but no other issues.

Wheel & Tire FAQ - Drag Wheels - CamaroZ28.Com Message Board

Wheels and Tires - Wheel & Tire FAQ - Drag Wheels - In order to make the FAQ topics easier to find, I've pulled out the drag wheel posts, into their own thread. So far we have info on: -Weld Pro-Star (DragLites are similar) -Bogart -Weld Aluma-Star 2.0 If you have specific info on size, offset...

www.camaroz28.com

The reason I’m trying to find out if grinding or a spacer is needed is because I really don’t want to do either, if I indeed need a spacer I’ll just buy the more expensive Weld RTS wheels that are guaranteed to fit as is.

Thank you for the link but there is nothing specific about billet specialties.

I have not heard back from her yet.

For Welds we used to run a spacer yes.

I'm thinking you don't need them for Billet Specialties, but I never ran those on any of my cars.

Thanks for checking

Billet Speciaties are made specific for 4th Gen F cars and shouldn't require any spacers with stock brakes. No need to grind the rear calipers either.

The rears are F body specific and guaranteed to fit, the fronts are not.

 

[Aron]

The reason I’m trying to find out if grinding or a spacer is needed is because I really don’t want to do either, if I indeed need a spacer I’ll just buy the more expensive Weld RTS wheels that are guaranteed to fit as is.

Thank you for the link but there is nothing specific about billet specialties.


Thanks for checking

The rears are F body specific and guaranteed to fit, the fronts are not.

Hmmm...they used to have fronts as well.