68 l78 - Team Camaro Tech
Wheels & Tires What fits what?

 
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post #1 of 15 (permalink) Old Mar 19th, 17, 04:31 PM Thread Starter
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68 l78

Hi All

I am trying to find out what are the correct wheels for my car

I understand that an L78 came with front (only) disc brakes

I also understand from CRG that unlike 67, where disc brakes would obligate rallye wheels, that was not the case in 68:

"For 1967, rally wheels were required when disc brakes were ordered. This restriction was removed in 1968 (despite some 1968 dealer literature that indicates that disc brakes were required with rally wheels). Which means that in 1968-69, disc brake cars came with plain steel wheels, unless the ZJ7 rally wheel option was added (except for Z28 which included rally wheels)." Camaro Chassis - Suspension, Axle, Brakes, & Wheels

so, according to the chart on the same page, my wheels would be XF:

Year Type Brakes Code Size Application
---- ----- ------ ---- ---- -----------
1968 Steel Disc XF 14x6 Base, SS

do you agree?

if the disc brakes are only on the front, does that mean that just the fronts would be XF and the rears would be FC?

Lastly, if my car was a June 68 build, what would be the correct date range for wheels that would have come with my car?


Thanks!
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post #2 of 15 (permalink) Old Mar 19th, 17, 08:27 PM
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Re: 68 l78

Power brakes (not disc) were required on big block cars starting in April 68. See foot note #8...

CRG Visual ID 1968 Model HyperTable

So your car being a June build, definitely had power brakes. Is there any other evidence suggesting disc or drum brakes ? Do you have the booster and any chance it's original ?

  • '68 RS, AA, 749, L30, M(uncie)20 (originally a 3spd), 15yr backburner resto........
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post #3 of 15 (permalink) Old Mar 19th, 17, 10:06 PM
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Re: 68 l78

OK, I seen your car in the "Welcome Wagon" forum, nice find ! ...and welcome back !

So it most likely had PDB originally. You can investigate that further if you wish, to confirm. You could check the code on the booster to start with. The master cylinder is an aftermarket replacement, I believe, but that can be expected.

You're correct, original wheels would've been XF coded if they were standard wheels or XG coded if optional rally wheels were ordered. All 5 (including the spare) would be the same.

I'm not sure on acceptable dates. 3wks -3months prior to the car build date is my best guess ?

  • '68 RS, AA, 749, L30, M(uncie)20 (originally a 3spd), 15yr backburner resto........
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post #4 of 15 (permalink) Old Mar 20th, 17, 10:14 AM Thread Starter
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Re: 68 l78

Thanks Garth

on the booster, what am i looking for and where is it located?

yes, the MB cylinder is after market

thanks for your assistance!

anyone else have a thought on an acceptable date range?

thanks
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post #5 of 15 (permalink) Old Mar 20th, 17, 02:14 PM Thread Starter
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Re: 68 l78

PS: to be clear, a 14" x 6" wheel (i.e., the XF) will fit over the 4 piston caliper of the front brakes? (and yes, I have power brakes and disc brakes in the front; drums in the rear)

thanks,
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post #6 of 15 (permalink) Old Mar 20th, 17, 02:18 PM
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Re: 68 l78

Yep, you're welcome.

The booster code is on the tab at the top. 9079 is drum, 9078 is disc. There's a date code on the back as well.

Camaro Chassis - Suspension, Axle, Brakes, & Wheels

  • '68 RS, AA, 749, L30, M(uncie)20 (originally a 3spd), 15yr backburner resto........
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post #7 of 15 (permalink) Old Mar 20th, 17, 02:23 PM Thread Starter
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Re: 68 l78

Thanks Garth

I'll check (for some reason, from memory, i want to say it is 441...but that doesn't match up with what you wrote...we'll see)
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post #8 of 15 (permalink) Old Mar 20th, 17, 02:28 PM Thread Starter
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Re: 68 l78

have checked - it is "144" - aftermarket?
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post #9 of 15 (permalink) Old Mar 20th, 17, 02:35 PM Thread Starter
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Re: 68 l78

the break pedal is stamped "disc brake"...which is consistent with a 68:

CRG: "1968 - Manual drum brakes on all four wheels remained standard for all models except Z28 and mid-year SS396. RPO J50 power assist remained a separate option for drum brakes, but RPO J52 front disc brakes now included RPO J50, and thus all 1968 disc brakes were also power disc brakes. This was the last year for the 4-piston disc brake calipers. The disc brake emblem appeared on the brake pedal of disc brake equipped cars in the January / February 68 timeframe."
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post #10 of 15 (permalink) Old Mar 20th, 17, 02:39 PM
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Re: 68 l78

I think 144 might be the Julian date. That's on the rear side ? Check the other side of the tab for the 907X code.

Camaro VIN, Cowl Tag, and other Numbers Decoding

  • '68 RS, AA, 749, L30, M(uncie)20 (originally a 3spd), 15yr backburner resto........
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post #11 of 15 (permalink) Old Mar 20th, 17, 04:05 PM Thread Starter
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Re: 68 l78

That was on the front

Will have to look at back tomorrow

Thanks

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post #12 of 15 (permalink) Old Mar 20th, 17, 04:42 PM Thread Starter
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Re: 68 l78

By the way, 144 if it stands for the 144th day of 1968 would fit nicely for a June build.....
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post #13 of 15 (permalink) Old Mar 20th, 17, 07:59 PM
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Re: 68 l78

Yep, it was a Thursday, May 23, 1968.

  • '68 RS, AA, 749, L30, M(uncie)20 (originally a 3spd), 15yr backburner resto........
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post #14 of 15 (permalink) Old Mar 23rd, 17, 01:34 AM
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Re: 68 l78

Quote:
Originally Posted by Stephen View Post
Thanks Garth

...anyone else have a thought on an acceptable date range?

thanks
Maybe try the Restoration or Tag Team forums for wheel dates. Some of the guys "in the know" may not take time to check wheels and tires.

Any luck on the booster code ?

  • '68 RS, AA, 749, L30, M(uncie)20 (originally a 3spd), 15yr backburner resto........
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post #15 of 15 (permalink) Old Mar 23rd, 17, 04:48 AM Thread Starter
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Re: 68 l78

Garth thanks for the follow up and the suggestion

I have not had a chance to get to the car to look for the code but I plan to

Will come back then

Thanks

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