Front disc's

[Andy4639]

Who has the Boss 338's and slotted drilled rotors installed? I bought a set a while back but the hub was way to big for the wheels. I sent them back because they guaranteed them to fit with no mods.
Does anybody have them and if so who did you get them from? If I have to I'll turn them down I guess.

[mgchevyparts]

Are you saying you returned the wheels or the rotors? The rotors have nothing to do with the Boss' not fitting, the Boss' were not made for these trucks but I understand that the newer ones will now fit, someone else can verify this.

[mgchevyparts]

Get the Ridlers, fit like a glove

[Andy4639]

I want the rotors. The wheels are fine they work great. The hub of the aftermarket rotor was twice the thickness of the stock rotor. I want a set of drilled and slotted rotors for it.

[mgchevyparts]

Originally Posted by Andy4639

I want the rotors. The wheels are fine they work great. The hub of the aftermarket rotor was twice the thickness of the stock rotor. I want a set of drilled and slotted rotors for it.

What disc brake kit do you have? All the normal sized disc brake kits I know off use the OEM 1971 and up rotor.

[Andy4639]

Mine is all factory 71. All I did was paint the calipers red but they are 72 caliper's.

[mgchevyparts]

I don't think there is an aftermarket rotor that is different. They have a 3.06" snout and it was common knowledge that the Boss did not fit without removing the wheels cap. But I think they changed the wheel to fit now. My picture above is my 75 but that's the exact same rotor as your 71.

[Andy4639]

The ones I bought didn't even make to the cap. They hit the opening about 1/2 way in.
Where did you get yours I may try another set. I will even take and have them shaved if I have to. I have a good friend with a brake machine he should be able to shave it off for me.

[mgchevyparts]

OEM replacement rotors that I have cross drilled for my kits.
The Boss' fit your rotors now, right? A cross drilled rotor is exactly what you have now just cross drilled, no reason for it not to fit if the ones you have now fit.

[markiemark]

maybe the wheels were just boxed wrong and shipped out to you. Might sound like a stretch but that's the way I'm hearing it... Just a thought...

[mgchevyparts]

There's a super long thread on this site about Boss' not fitting (they hit the rotor snout) but were supposed to be changed to fit.

[Andy4639]

Guy's I know all about the Boss thread. I posted in it several times. I also know there are 2 sizes of rotors also in that thread. I also know that the aftermarket rotors I bought looked huge, I talked to the sales rep for over a hour telling him what wheels I had and all the info I could give him. The rotors were way to big hub wise when I got them.

My rotors & wheels
The wheels would fit but you couldn't install the cap thats it. With the rotors I ordered they wouldn't even fit the opening of the wheels. I thought the same thing when I sent them back that they some how placed the wrong ones in the box but after calling and talking to them they were the correct rotor they said per their markings.

I just want to know if some one has the Boss wheels with a slotted and drilled rotor with a name are part number I can try. That's all.

[tony58]

Slotted and drilled rotors will be the same as you have now just slotted and drilled. If someone sold you rotors with a larger hub then they sold you the wrong rotors.

[lolife99]

Originally Posted by tony58

Slotted and drilled rotors will be the same as you have now just slotted and drilled. If someone sold you rotors with a larger hub then they sold you the wrong rotors.

I don't think this is correct.
I have seen several rotors that were different sizes right at the end of the rotor hub.
I think it has to do with the differences in spec of overseas manufacturing.
(low priced chinese junk)
I guess they think it doesn't matter how much meat they put into the rotor hub,... but it does with these specific wheels.
I usually try to buy the higher end rotors. (American made if possible)
OEM GM rotors seem to be the best, but they are long gone.

No matter which rotor you buy,... there will be grinding involved on the rotor hub to fit the Boss 338 wheels,... unless you have the light duty 81-87 rotors, spindles and calipers on your truck.

[lolife99]

I would contact these guys.
http://brakeperformance.com/brake-ro...s.php?did=4138
I now prefer dimpled rotors instead of the drilled rotors.
(less likely to crack, supposedly)
Plus I also prefer a coated rotor.
Zinc or otherwise.

[Andy4639]

Originally Posted by lolife99

I would contact these guys.
http://brakeperformance.com/brake-ro...s.php?did=4138
I now prefer dimpled rotors instead of the drilled rotors.
(less likely to crack, supposedly)
Plus I also prefer a coated rotor.
Zinc or otherwise.

Thank you sir. That's all I wanted was some one to recommend a company. Have you ordered from them before?

Yes I realize I will have to mill are grind the rotor down to make it fit.
Just didn't feel like doing it after the guy insisted there's would fit.

[tony58]

Originally Posted by lolife99

I don't think this is correct.
I have seen several rotors that were different sizes right at the end of the rotor hub.
I think it has to do with the differences in spec of overseas manufacturing.
(low priced chinese junk)
I guess they think it doesn't matter how much meat they put into the rotor hub,... but it does with these specific wheels.
I usually try to buy the higher end rotors. (American made if possible)
OEM GM rotors seem to be the best, but they are long gone.

No matter which rotor you buy,... there will be grinding involved on the rotor hub to fit the Boss 338 wheels,... unless you have the light duty 81-87 rotors, spindles and calipers on your truck.

False. Rotors are built to a OEM specification. The hub diameter or register as it's called is precise in that the wheel registers on it. If the hub was larger then it was either the wrong rotor or it was grossly made incorrectly, which is possible I suppose. The 1.25" thick rotor has a register that is 3.06", it can be smaller at the top(tapers) but the area that the wheel meets must be 3.06" diameter, height has to be the same as the bearing spacing is also a critical dimension as most other dimensions are. Where do you find USA made rotors? Even the ones that come on new cars/trucks are not made in USA

[Andy4639]

thanks guy's for the input!

Well we will see how they fit. I ordered these just now.I take pictures when they arrive and show how they do.

[lolife99]

Originally Posted by tony58

False. Rotors are built to a OEM specification. The hub diameter or register as it's called is precise in that the wheel registers on it. If the hub was larger then it was either the wrong rotor or it was grossly made incorrectly, which is possible I suppose. The 1.25" thick rotor has a register that is 3.06", it can be smaller at the top(tapers) but the area that the wheel meets must be 3.06" diameter, height has to be the same as the bearing spacing is also a critical dimension as most other dimensions are. Where do you find USA made rotors? Even the ones that come on new cars/trucks are not made in USA

The area where the "wheel meets the rotor" is not the area in question.
It's the nose of the rotor,... that will not fit inside the Boss 338 wheel without a small amount of grinding.
The cheapest rotors available have a large square edge here compared to the slight taper of the better quality rotors.

And you are correct about the rotors.
AC/Delco rotors (I use to buy),... are only "machined" in the USA.
Castings are outsourced from other countries.
SO sad,...

[mgchevyparts]

Originally Posted by Andy4639

thanks guy's for the input!

Well we will see how they fit. I ordered these just now.I take pictures when they arrive and show how they do.

Those are Centric rotors, $80 each at Rockauto.com. I buy most of my rotors from Centric but I take them to a CNC cross driller. I've never seen this rotor that wasn't tapered in the snout but they still will hit those Boss wheels from what I've heard. Turn them down on a lathe for clearance if necessary

[Andy4639]

That is my plan. I will get them turned down to fit.

Question:

I have a friend who has is own brake machine to turn rotors, could I use it to turn the rotor hub also. He want charge me anything for my time to stand there. He can set it up and I will watch it.

[magwakeenercew2jh]

Originally Posted by Andy4639

[B][COLOR="Red"]That is my plan. I will get them turned down to fit.

ECE supplied the rotors.
Bosch supplied the grinder.
I supplied the 5 mins per side.

[Andy4639]

Originally Posted by magwakeenercew2jh

ECE supplied the rotors.
Bosch supplied the grinder.
I supplied the 5 mins per side.

I traded the guy at the wheel store for the simulators to grind them the first time. I later grinded them again after I lost 2 caps. Then I found out my caliper was sticking and get really hot and melting the o ring and that's why they kept flying off.

If it just needs the grinding I can handle that but I'm thinking they will need more than just the ends done.