Mini Tubs on a 65 Fastback? - Vintage Mustang Forums

Reply
 
Thread Tools
post #1 of 34 (permalink) Old 10-21-2007, 03:46 PM Thread Starter
Member
 
Join Date: Sep 2003
Location: San Francisco
Posts: 73
I've got a 65 fastback that currently has 245/40/17's on the rear. Nowhere near enough meat for 652bhp/620tq-6000rmp. I would love to get 295 - 315's to fit. I'm thinking the only shot is with mini tubs and completely rolled lip. I definitely don't want to flare it but may land up doing a subtle custom 1" flare if needed.

The car has the Griggs Racing GR350 suspension so there's no leafsprings. The GR350 suspension does use the rear of the frame rails so they can't be moved. If I move the inner wheelhouses to the frame rail, I only gain about 1 - 1 1/2".

Couple of questions:

1. Anyone know if I can fit a 295+ without flaring?
2. Will the interior side panels need to be altered (I have a Shelby GT350 seat delete)

Thanks-
Craig Backer

1965 Mustang Fastback
Griggs Racing GR-350 Suspension
Dart Block 302 - stroked and bored to 348
Novi 2000 w/ 9.5#
652bhp/620 tq-6000rmp
T56 Six Speed (Cobra version)
9" w/ 3.70:1
fastbacker is offline  
Sponsored Links
Advertisement
 
post #2 of 34 (permalink) Old 10-21-2007, 04:43 PM
Senior Member
 
Join Date: Jun 2001
Location: North Carolina
Posts: 4,971
Quote:
Will the interior side panels need to be altered (I have a Shelby GT350 seat delete)
Yes, and it won't be pretty.

Dave



"The danger of communication is the illusion that it has occured"
DaveSanborn is offline  
post #3 of 34 (permalink) Old 10-21-2007, 05:50 PM
Senior Member
 
Join Date: May 2005
Location: USA
Posts: 713
You may as well just take off the rear quarter panel and add a Watt's link.


1966 red fastback.
Gingerstang is offline  
post #4 of 34 (permalink) Old 10-21-2007, 09:36 PM
Senior Member
 
DrStang's Avatar
 
Join Date: Apr 2001
Location: Palm Springs, California
Posts: 2,284
I have the same problem with my setup at 616hp. I was also interested in this tubbing thread to see if I could get a wider tire in there. I run 255's right now.

"A good friend will help you move. A great friend will help you move a dead body"

1965 A-Code Fastback
Built, September 14, 1964 (San Jose)
Viper red, White/red interior
TCP R&P, G Bar rear 4 link/w shockwaves
Global West Upper/Lower/Strut Rods
Ride-Tech Air ride
4 wheel Cobra disc brakes/Hydroboost
363 Stroker/Paxton Supercharger
Mass-Flo EFI
Owned since 1983
DrStang is offline  
post #5 of 34 (permalink) Old 10-22-2007, 12:04 AM
Member
 
Join Date: Dec 2006
Posts: 39
What rim size and backspacing are you running to fit 255s on the rear?
jestang is offline  
post #6 of 34 (permalink) Old 10-22-2007, 12:13 AM
Senior Member
 
DrStang's Avatar
 
Join Date: Apr 2001
Location: Palm Springs, California
Posts: 2,284
Quote:
Originally Posted by jestang
What rim size and backspacing are you running to fit 255s on the rear?
I'm running a 17x8 inch Ford Bullit rim with 5.72"BS and a 0.5" spacer

"A good friend will help you move. A great friend will help you move a dead body"

1965 A-Code Fastback
Built, September 14, 1964 (San Jose)
Viper red, White/red interior
TCP R&P, G Bar rear 4 link/w shockwaves
Global West Upper/Lower/Strut Rods
Ride-Tech Air ride
4 wheel Cobra disc brakes/Hydroboost
363 Stroker/Paxton Supercharger
Mass-Flo EFI
Owned since 1983
DrStang is offline  
post #7 of 34 (permalink) Old 10-22-2007, 01:03 AM Thread Starter
Member
 
Join Date: Sep 2003
Location: San Francisco
Posts: 73
Quote:
Originally Posted by jestang
What rim size and backspacing are you running to fit 255s on the rear?
My AR Torque Thrust II (17X8) running 245/40/17's use 4 3/4" backspacing. The fender lips are slightly rolled. There is about 3/4" clearance on the inside front wheelhouse.

1965 Mustang Fastback
Griggs Racing GR-350 Suspension
Dart Block 302 - stroked and bored to 348
Novi 2000 w/ 9.5#
652bhp/620 tq-6000rmp
T56 Six Speed (Cobra version)
9" w/ 3.70:1
fastbacker is offline  
post #8 of 34 (permalink) Old 10-22-2007, 12:14 PM Thread Starter
Member
 
Join Date: Sep 2003
Location: San Francisco
Posts: 73
Quote:
Originally Posted by DaveSanborn
Quote:
Will the interior side panels need to be altered (I have a Shelby GT350 seat delete)
Yes, and it won't be pretty.

Dave
I'm wondering if a talented interior guy could modify the existing interior panels by extending them in to sort of look stock.

Does anyone know how much the side panels would have to be moved in towards the center of the car?

Thanks-
Craig Backer

1965 Mustang Fastback
Griggs Racing GR-350 Suspension
Dart Block 302 - stroked and bored to 348
Novi 2000 w/ 9.5#
652bhp/620 tq-6000rmp
T56 Six Speed (Cobra version)
9" w/ 3.70:1
fastbacker is offline  
post #9 of 34 (permalink) Old 10-22-2007, 04:21 PM
Senior Member
 
Join Date: Jun 2001
Location: North Carolina
Posts: 4,971
Quote:
Does anyone know how much the side panels would have to be moved in towards the center of the car?
That's directly related to how much you want to move the inner wheelwells inboard. The interior side panels butt up against the inside edge of the inner wheelwell at the bottom of the panel... sans approx. .5 -.75".

You're presently running a rear seat delete. If you move the inner wheelwells in more than the aforementioned .5 -.75", you'll never be able to re-install the original back seat without also narrowing the seat... and this is a royal PITA.

A couple weeks ago, I mocked up a set of 275/45/17's on the rear of the '66 FB I'm working on. The wheel was a 17x9.5 w/5.5"BS. To get them to fit, I'll need more BS. I had at least an inch of clearance between the outside of the tire and the inside of the fender lip, so I'm guessing (at this point) that a 6" BS would fit the 275's perfectly.

My wheelwells have been slightly enlarged, the rear-end has been narrowed and uni-body structural pieces have been replaced in favor of a full frame chassis, so don't compare mine as if it were stock.

Your dilemma is one that most novices overlook...

... the "overbuilt" engine is worthless in a car that can't transfer that power to the ground. You obviously took the time and spent the money to build the
Quote:
652bhp/620tq-6000rmp
engine. Now you'll have to spend a lot more to make that power useful.

I assume that you've tried all of the easier (cheaper) fixes? Traction devices, tire style, etc.?? When you have to stuff 315's, you'll need flares AND widened inner wheelwells.

Dave



"The danger of communication is the illusion that it has occured"
DaveSanborn is offline  
post #10 of 34 (permalink) Old 10-22-2007, 04:37 PM
Myopic
 
dodgestang's Avatar
 
Join Date: Aug 2002
Location: Omnipresent
Posts: 16,939
Stock distance from frame rail to sheet metal is 11 inch +/- small variance for cars.

Here is a 275 on an 8 inch rim on a 65:

less than 1/4 to the frame rail and hard contact on the inner wheel well, a mini tub would remove the contact with the wheel well but would not move the frame rail.





Nick
1965 Fastback 410c AOD - DT
1967 Fastback 347 T5- Cruiser
1968 Fastback 408w T5 - Brute
1991 GT Hatch - Fauxbra
1996 Dodge Viper GTS

https://www.youtube.com/watch?v=0LUK2D0GjdY
dodgestang is online now  
post #11 of 34 (permalink) Old 10-22-2007, 09:29 PM Thread Starter
Member
 
Join Date: Sep 2003
Location: San Francisco
Posts: 73
Quote:
Originally Posted by DaveSanborn
Quote:
Does anyone know how much the side panels would have to be moved in towards the center of the car?

stock.

Your dilemma is one that most novices overlook...

... the "overbuilt" engine is worthless in a car that can't transfer that power to the ground. You obviously took the time and spent the money to build the
Quote:
652bhp/620tq-6000rmp
engine. Now you'll have to spend a lot more to make that power useful.


Dave
I didn't overlook the need for tire with this kind of hp. I just figured I'd have fun and spin the tires for awhile until it was time for bodywork. It's now time for bodywork.

The wheelhouse mods will be a drop in the bucket compared to cost of the build of the rest of the car.

-Craig Backer

1965 Mustang Fastback
Griggs Racing GR-350 Suspension
Dart Block 302 - stroked and bored to 348
Novi 2000 w/ 9.5#
652bhp/620 tq-6000rmp
T56 Six Speed (Cobra version)
9" w/ 3.70:1
fastbacker is offline  
post #12 of 34 (permalink) Old 10-22-2007, 09:42 PM
Senior Member
 
DrStang's Avatar
 
Join Date: Apr 2001
Location: Palm Springs, California
Posts: 2,284
Can't wait to see the finished product. I'll be watchin'

"A good friend will help you move. A great friend will help you move a dead body"

1965 A-Code Fastback
Built, September 14, 1964 (San Jose)
Viper red, White/red interior
TCP R&P, G Bar rear 4 link/w shockwaves
Global West Upper/Lower/Strut Rods
Ride-Tech Air ride
4 wheel Cobra disc brakes/Hydroboost
363 Stroker/Paxton Supercharger
Mass-Flo EFI
Owned since 1983
DrStang is offline  
post #13 of 34 (permalink) Old 10-22-2007, 09:58 PM Thread Starter
Member
 
Join Date: Sep 2003
Location: San Francisco
Posts: 73
The way I'm seeing things, I can get 6.5" of backspacing with a 1/2"- 3/4" of clearance by moving the inner wheelhouse in close to the frame rail. With a flat rolled lip, I'm guessing I can fit a 10" wide wheel.

Now I'm wondering about pushing the quarter out without flaring it to get another inch. Has anyone done this via moving the outer wheelhouse out to slightly bulge the quarter?

Thanks-
Craig Backer


1965 Mustang Fastback
Griggs Racing GR-350 Suspension
Dart Block 302 - stroked and bored to 348
Novi 2000 w/ 9.5#
652bhp/620 tq-6000rmp
T56 Six Speed (Cobra version)
9" w/ 3.70:1
fastbacker is offline  
post #14 of 34 (permalink) Old 10-22-2007, 09:59 PM Thread Starter
Member
 
Join Date: Sep 2003
Location: San Francisco
Posts: 73
Quote:
Originally Posted by DrStang
Can't wait to see the finished product. I'll be watchin'
How do I post pics in a post?

-
CB

1965 Mustang Fastback
Griggs Racing GR-350 Suspension
Dart Block 302 - stroked and bored to 348
Novi 2000 w/ 9.5#
652bhp/620 tq-6000rmp
T56 Six Speed (Cobra version)
9" w/ 3.70:1
fastbacker is offline  
post #15 of 34 (permalink) Old 10-22-2007, 11:20 PM
Senior Member
 
Fast68back's Avatar
 
Join Date: Jan 2004
Location: my own little world
Posts: 4,892
There is a '65 FB that was in the Dec '04 Mustang &Fords magazine that was minitubbed and running 335's on 18X11's. The article says that shop that did the work was Hotwheels Custom autobody in Mount Vernon Washington...Hope that helps.





-Rick
IF YOU DON'T STAND BEHIND OUR TROOPS,
PLEASE, FEEL FREE TO STAND IN FRONT OF THEM
Fast68back is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Vintage Mustang Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome