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Old 10-21-2007, 04:46 PM   #1 (permalink)
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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
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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
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Old 10-21-2007, 05:43 PM   #2 (permalink)
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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
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Old 10-21-2007, 06:50 PM   #3 (permalink)
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You may as well just take off the rear quarter panel and add a Watt's link.
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Old 10-21-2007, 10:36 PM   #4 (permalink)
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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.
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1965 A-Code Fastback
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TCP R&P, G Bar rear 4 link/w shockwaves
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Old 10-22-2007, 01:04 AM   #5 (permalink)
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What rim size and backspacing are you running to fit 255s on the rear?
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Old 10-22-2007, 01:13 AM   #6 (permalink)
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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
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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
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Old 10-22-2007, 02:03 AM   #7 (permalink)
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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.
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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
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Old 10-22-2007, 01:14 PM   #8 (permalink)
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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
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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
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Old 10-22-2007, 05:21 PM   #9 (permalink)
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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
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Old 10-22-2007, 05:37 PM   #10 (permalink)
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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.




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Old 10-22-2007, 10:29 PM   #11 (permalink)
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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
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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
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Old 10-22-2007, 10:42 PM   #12 (permalink)
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Can't wait to see the finished product. I'll be watchin'
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"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
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Old 10-22-2007, 10:58 PM   #13 (permalink)
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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

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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
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Old 10-22-2007, 10:59 PM   #14 (permalink)
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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
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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
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Old 10-23-2007, 12:20 AM   #15 (permalink)
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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.



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