Brake Rotor

[bcstingray]

I'm in the process of changing the front brake caliper, hoses, rotors and pads on my 73. When I took the rotors off I found that it had the 1.25 inch rotors. The rotors I bought (before I took them off) were the 1 inch.

Does it matter if I use the 1"rotors?

[bd]

1" and 1.25" rotors are not interchangeable.

Brake Tech, what do all the numbers mean...

[bcstingray]

Thanks. The rotors I took off have a groove on both sides of the rotor. I've never seen this before. The grooves are in the same spot on each rotor.

[80Chevy4x4]

If the grooves are identical in both rotors and they are almost in the middle of the pad surface on the rotor GM has put a single groove in rotors in the past.

[bcstingray]

Like these?

[bd]

Those grooves are machined by the manufacturer.