Z51 Handling Package
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Tire size is not meaningless. He has replacement tires on his car. A buyer of tires could very well have bought wider tires for the wider wheels. I would have. The wider rear wheels were put on the Z51 to carry wider tires!
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Originally Posted by CFI-EFI
It would also indicate, with a fair degree of confidence that
he does NOT have a have a C4. Despite plans to the contrary, and
publications that relied on those plans, all the 1984s had 8.5" X 16"
(standard) or 8.5 and 9.5" X 16" (Z51) aluminum wheels.
he does NOT have a have a C4. Despite plans to the contrary, and
publications that relied on those plans, all the 1984s had 8.5" X 16"
(standard) or 8.5 and 9.5" X 16" (Z51) aluminum wheels.
Thanks for the correction, CFI-EFI and my apologies to the OP.
.
Last edited by Slalom4me; Jul 2, 2006 at 11:46 PM.
Team Owner
Joined: Jul 2002
Posts: 22,267
Likes: 15
From: The light that never warms.
St. Jude Donor '12
Originally Posted by BADDUCK
Tire size is not meaningless. He has replacement tires on his car. A buyer of tires could very well have bought wider tires for the wider wheels. I would have. The wider rear wheels were put on the Z51 to carry wider tires!
The wheel size is important, if original. There is very little chance the tires are original.
Racer
Joined: Jan 2006
Posts: 287
Likes: 0
From: Forest Hill Maryland
Originally Posted by lite blue
The depth of the inner dish on 8.5 and 9.5 wheels are noticably different. If they are original, you will either have 8.5 all around (non Z51) or 8.5 front and 9.5 rear(Z51). Tire size is meaningless. Original is 255/50R16, regardless of Z51 or not.
They do have the dimensions stamped on the inside of the wheel, if you want to be sure.
They do have the dimensions stamped on the inside of the wheel, if you want to be sure.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Wider wheels were put on Z51 to mount wider tires. The standard tire width for a 9.5" rim is 275. I know I run them. I realize it is not PROOF but it is certainly not meaningless.
Last edited by BADDUCK; Jul 3, 2006 at 08:19 AM.
Thread Starter
Racer
Joined: May 2006
Posts: 351
Likes: 0
From: Bay Area CA
Update 4th of July! 
1) 360 degree X'2 steering lock to lock
2) wheels are 8.5" front 9.5" rear
3) no oil cooler - that I can find
4) no aux radiator fan
I am really confused -
Hoppe you all had a good 4th
1) 360 degree X'2 steering lock to lock
2) wheels are 8.5" front 9.5" rear
3) no oil cooler - that I can find
4) no aux radiator fan
I am really confused -
Hoppe you all had a good 4th
Racer
Joined: Jun 2006
Posts: 461
Likes: 0
From: ilion ny
i did see somewheres on the internet (i have an 84 but not z-51) that all 84s came with the 16 inch wheels mine has after market 16x9.5 on front and back but i believe the originals were 16x8.5 front and 16x9.5 rear. does anyone know if all the parts are interchangeable between a z-51 and a non z-51 car (i assume they all are) if not that would be the best place to check i would assume alot of non-z-51 cars might have had upgrades done by their owners as theyve either wanted the better equipment or maybe had it done as stuff wore out
Racer
Joined: Jun 2006
Posts: 461
Likes: 0
From: ilion ny
it also stated the z-51 and non z-51 came as the same widths there was a reason stated they did this but i forgot what it is at the moment if it was me looking id go with the diameter in the swaybars less likely to have been changed out and be more of an accurate tell also unless the owner of the car is the original owner and knows the wheels are original i wouldnt count on it anyone can tell ya that line weather its true or not is weather someone wants to believe it and from a 20+ yyear old car its anyones guess
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Racer
Joined: Jun 2006
Posts: 461
Likes: 0
From: ilion ny
the engine oil cooler isnt a sighn of a z-51 in an 84 25,9995 z-51 and only4295 cars with oil cooler also if u check this site all corvettes of 1984 came with the same wheels they all have the same rpo code if the z-51 car had diff rims this wouldnt be the case you can also see the oil cooler #s and the Z-51 #s they dont match.
http://www.corvetteactioncenter.com/...84/84prod.html
http://www.corvetteactioncenter.com/...84/84prod.html
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Originally Posted by PourJim
3) no oil cooler - that I can find
exchanger. It consists of a block (the exchanger)
that mounts between the oil filter and filter pad.
There are hoses that circulate coolant to/from the
cooler block.
If the '84's use the same cooler, then there will be
a metal tube (3/4" dia?) passing under the oil pan
between the sump and the crossmember. You
might be able to see the area while the car is on
the ground by reaching underneath with a mechanic's
extension mirror and a flashlight.
.
Racer
Joined: Aug 2005
Posts: 336
Likes: 3
From: State of Confusion
Originally Posted by BADDUCK
Wider wheels were put on Z51 to mount wider tires. The standard tire width for a 9.5" rim is 275. I know I run them. I realize it is not PROOF but it is certainly not meaningless.
Le Mans Master
Joined: May 2006
Posts: 8,824
Likes: 3
From: The left Coast
St. Jude Donor '08
I don't think one could assume a 22 year old car would have stock wheels and tires. It might but you know what they say about the word assume. The best bet is to order a build sheet from NCM.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
That's true if he can't find the codes. I asked him about shocks and front stabilizer diameter but no luck! None of the stuff we have talked about is proof, but added together it will make a strong argument one way or the other. Some people get hung up and make "absolute assertions."
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by BADDUCK
Some people get hung up and make "absolute assertions."
Originally Posted by BADDUCK
If your rear tire size is wider ie 275 then you probably have a Z51, if they are the same front and rear ie 245 you probably don't.
Originally Posted by BADDUCK
Tire size is not meaningless. He has replacement tires on his car. A buyer of tires could very well have bought wider tires for the wider wheels. I would have. The wider rear wheels were put on the Z51 to carry wider tires!
Originally Posted by BADDUCK
Wider wheels were put on Z51 to mount wider tires. The standard tire width for a 9.5" rim is 275. I know I run them. I realize it is not PROOF but it is certainly not meaningless.
Don't you just hate it when "Some people get hung up and make "absolute assertions."", like "If your rear tire size is wider ie 275 then you probably have a Z51" or "if they are the same front and rear ie 245 you probably don't.", when they ALL had 255 tires? Or when someone who doesn't know what he is talking about says, something like, "The wider rear wheels were put on the Z51 to carry wider tires!" when in fact... they weren't? Or when some genius says something like, "Wider wheels were put on Z51 to mount wider tires. The standard tire width for a 9.5" rim is 275." when they didn't even MAKE a 275/50/16 in 1984? I'm not sure if they do now. The 275 tires being referenced are 17", which didn't come on C4s before 1988.
Don't you just hate it when "Some people get hung up and make "absolute assertions."" especially when they don't know what they are talking about?
RACE ON!!!
Instructor
Joined: Sep 2005
Posts: 184
Likes: 0
I just went in my safe & got my build sheet, maronie label (window sticker) & owners manual. The Z51 option was a big whopping 51.00. You can order the above for "84 thru present for $30 from BG museum. Just send proof of ownership & vin.My vette was a late built 6-14-84-day shift $26920.00 On a Z51 front wheels were 16-8.5 rear 16-9.5 I have most of my original equip in storeage including CFI engine on a stand. I would encorage anyone to take a tour of plant & museum It's something you will never forget. along with Summit store & Don Garletts museum
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by scooter18155
the engine oil cooler isnt a sighn of a z-51 in an 84 25,9995 z-51 and only4295 cars with oil cooler also if u check this site all corvettes of 1984 came with the same wheels they all have the same rpo code if the z-51 car had diff rims this wouldnt be the case you can also see the oil cooler #s and the Z-51 #s they dont match.
http://www.corvetteactioncenter.com/...84/84prod.html
http://www.corvetteactioncenter.com/...84/84prod.html
The 1984 was spec'd for 7" X 15" front wheels and with 7.5" X 15" rear wheels as standard, with P215/65R-15 Eagle GT blackwall tires, all the way (how can they do that?) around. The RPO# QZD was 16" wheels with P255/50/16 Eagle blackwall tires. Of the 51,547 1984 Corvettes built, 51,547 had the RPO# QZD.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by BADDUCK
O. K. Kiss my ***, hows that for an assertion!
RACE ON!!!
