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Our 70 has 255-60 15 all the way around on 15x8 Corvette Ralleys. No rubbing.
Wheel Tire Vehicle Car Sky
 
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1970 El Camino SS396, VortecPro 467, ATI TH400, Moser 12 bolt /TruTrac 3:42, Hedman headers
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I have BFG 235/70R-15’s all the way around on a 70 El Camino (15x7”wheels) with no issues, but it’s a later body style, I ran G70 x14’s on my 67SS back in the day on factory (15x6”) disc brake wheels, seems like there might be a fitment problem with 15x8 Corvette rally’s on the front at full lock. Might have been a backset issue.
 

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I have BFG 235/70R-15’s all the way around on a 70 El Camino (15x7”wheels) with no issues, but it’s a later body style, I ran G70 x14’s on my 67SS back in the day on factory (15x6”) disc brake wheels, seems like there might be a fitment problem with 15x8 Corvette rally’s on the front at full lock. Might have been a backset issue.
Have 255/70 on my 70 elky with no issues
 

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1970 El Camino SS396, VortecPro 467, ATI TH400, Moser 12 bolt /TruTrac 3:42, Hedman headers
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I believe the 66-67 Chevelles have less room in the wheelhouse area than our 68-72 Chevelles. But it seems the 66-67’s have more room in the engine compartment.
 

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I had 225-70 -15 on front of my 66 and they where fine never tried a 235 so can't say for sure, did not see a need for a bigger tire.
 

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for the front of 67 chevelle will they fit good no rubbing or scrapping fenders? the same for the rear size.
I'm not meaning to criticize you nor those who have chimed in to be of help. But there's lots of details/variables that aren't being mentioned which I believe can effect the outcome. Yes some guys fit similar sized front tires on their Chevelles without issues, but AFAIK, ride height can change resulting outcome, as could wheel back spacing differences, and even steering linkage parts and steering boxes if they aren't factory stock pieces or at least direct factory replacement parts.

And I'm guessing that it might also be possible that some aftermarket front control arms can dictate the maximum front tire size that can be used since some control arms are designed to change the caster angle. And like it's already been mentioned, 70-72 Chevelles have more room in the wheel wells than the 66-67 Chevelles do. So I think the question you've posed might be a tough one to really obtain definitive answers for, even though it's a great question.
 

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I have BFG 235/70R-15’s all the way around on a 70 El Camino (15x7”wheels) with no issues, but it’s a later body style, I ran G70 x14’s on my 67SS back in the day on factory (15x6”) disc brake wheels, seems like there might be a fitment problem with 15x8 Corvette rally’s on the front at full lock. Might have been a backset issue.
I'm just trying to figure out how you ran G70x14s on factory (15x6”) disc brake wheels... Maybe a tire stretcher? ;)
 

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I can almost assuredly say the 235/70 will rub on the back portion of the front wheel well going into a dip in the road.
 
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"
FYI: Actual diameter difference between 235/70/15 & 255/60/15 is about 3/4 of an inch.
Actually a full inch. 28" vs 27" according to a tire size calculator. Also if I look at Tire Rack and put both sizes in they range from .9" to 1". If you mix and match you could get as much as 1.1" Cooper Cobra 27" vs 27.9", BFG TA 27.1" vs 28", and Hankook Kinergy 26.9" vs 27.9".

 

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Actually a full inch. 28" vs 27" according to a tire size calculator. Also if I look at Tire Rack and put both sizes in they range from .9" to 1". If you mix and match you could get as much as 1.1" Cooper Cobra 27" vs 27.9", BFG TA 27.1" vs 28", and Hankook Kinergy 26.9" vs 27.9".

Yes, it varies depending on the manufacturer. Just wanted OP to know that the difference is not anywhere near 3" as previously stated.
 

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1970 El Camino SS396, VortecPro 467, ATI TH400, Moser 12 bolt /TruTrac 3:42, Hedman headers
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Correction...1967 Chevelle disc brake wheels were 14x6” not 15”. 1967 Corvettes were 15x6”.
 

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My stock height 66 with stock manual steering and drum brakes will not accept 235/70-15 on 15x7 wheels on the FRONT without rubbing the inner fender during turns. I have 225/70-15 now and they do not rub.

235/70-15 on the REAR do not rub.
 

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My stock height 66 with stock manual steering and drum brakes will not accept 235/70-15 on 15x7 wheels on the FRONT without rubbing the inner fender during turns. I have 225/70-15 now and they do not rub.

235/70-15 on the REAR do not rub.
As Billy said in his # 10 Post it depends on the Ride Height in the Front & Rear
plus the Back Space of the Wheel

I run COOPER Star Fire P205/70R15 Tires = Tread Width 5.59” /Side Walls Width 8"/ Dia 26.28"
on a JEGs Sport Star # 555-66062 15x7 Wheel with a BS 4”
and the FrontEnd is lowered ALMOST/about 2" from Stock Ride Height
Ground to Under Chrome Fender Lip = 25 3/8"
Tire Wheel Vehicle Car Plant


STOCK HEIGHT
Wheel Tire Car Vehicle Sky
 
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