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I have a 67 2dr with the factory 4 piston caliper disc brakes. My rally rims don't clear so I have some crappy universal spacers on there for now. I can't find any specifically for an impala so I ordered some for a camaro the same year that have their own studs. Is this a bad idea? What do you guys recommend I do?because I want to keep the rally's on it because I like the look.
 

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Are your Rally wheels 14'' ? 15" rallys should bolt right on.
 

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The factory used a 15 inch rally wheel with the four piston Girling brake calipers used on the Corvette and the Impala. Are you trying to use a 15" rim designed for drum brakes? I ask because if you had a 15 inch rally for disc brakes they would bolt up without a spacer.

There are 15" x 6"; 15" x 7"; and 15" x 8" rally wheels used on the C-2 and C-3 Corvettes that had the same brakes you have. Wider Corvette wheels have strange back spacings and are larger than 15 inch to clear larger disc rotors using BemBo and CPR brakes.

Big Dave
 

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14" wheels from the 70s/80s RWD mid size GM cars should work. Might be worth grabbing one from the junkyard to test fit.
 

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There are no 14 inch wheels that will fit over the four piston Corvette brakes.

1965 was the first year for the Girling style four piston fixed bridge vented rotor 11 inch disc diameter with 461 square inches of swept area (compared to the 1964 drum system with only 328 square inches of brake area). Because the caliper was so large the brakes required 15 inch wheels (which where only six inches wide in 1965-'66 jumping to 15 x7 inch in 1967 before climbing to 15 x8 inch dimensions for the heavier more muscular Mako Shark show car inspired 1968 model year).

Mid 70 to 80's mid size cars where equipped with the single piston full floating GM disc brake that was not offered on a the full size Chevy until 1971.

Big Dave
 

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I have a 67 2dr with the factory 4 piston caliper disc brakes. My rally rims don't clear so I have some crappy universal spacers on there for now. I can't find any specifically for an impala so I ordered some for a camaro the same year that have their own studs. Is this a bad idea? What do you guys recommend I do?because I want to keep the rally's on it because I like the look.
I tried the same thing years ago. 4 piston brakes from a 68 Impala on my 66. I could not find a single 14" wheel of any brand or style that cleared those calipers. I am convinced there was never a 14" wheel made that will work.
 

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I have some 14 inch rallys and they wont work with the bigger Impala brakes.
 

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They used the Corvette Girling style brakes on the full body and the Camaro, as well as the Chevelle for the two years 1967 - '68 when the single piston caliper was introduced on the smaller cars in 1969. Because Chevy engineers were concerned about the weight of the B-body cars overwhelming the single piston calipers ability to clamp the pad to the rotor; they kept the the Corvette brakes on the full size B-body cars up until 1970 (which didn't get the single piston caliper until 1971). The Corvette kept the four piston brakes made by Delco-Remy up until 1982.

Girling style brakes were chosen because they were what stopped all of the RAF's WWII bombers and fighter planes that all weighed in at over five tons and landed at over hundred miles an hour. If they could handle that kind of a heat load Chevy engineers knew it could stop a 435 horsepower 427 powered Corvette from 160 mph which was the anticipated top speed the car could obtain with factory gearing.

In 1983 Chevy switched over to PBR brakes on the Corvette and LT-1 optioned Camaro's because they were cheaper to buy than the they could make and support their own Delco-Remy brand parts that would seize up if you drove the car through standing water.

SSBC (aka Stainless Steel Brake Company) got it's start in Clearwater, Florida by sleeving the stock cast iron calipers with stainless steel sleeves to prevent the aluminum pistons from seizing to the calipers when Corvette owners drove through flooded streets in the summer time. They still do a booming trade upgrading Corvette brakes so that they work when they get wet.

Big Dave
 

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I'm not sure about the US Dave but in Canada we had a single piston caliper on our B body (same chassis as an Impala) sooner than 1971 as shown by the page I scanned from the Canadian b body parts catalouge.

I've never seen or heard of a 69 or newer Canadian B body (or any other GM body excluding Corvette which I have no knowledge of) with a factory 4 piston caliper.
 

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Discussion Starter #12
thank you guys

first off... i appreciate your responses.
yes they are the big brakes (girling as you called them) 4 piston. my rallys are 15x8 (i believe) i called classic industries and asked if they had an offset rally that would clear and i got this part #DK15x8a what do you think? also in san jose there is a place called daves rallys and he said bring it by and if he doesnt have one that fits he will grind down the calipers so i can use the ones i have...:cool:
 
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