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#2399209 - 11/06/17 03:48 AM Please help with selecting most effective tire size.
Adam71Charger Offline
pro stock

Registered: 06/01/13
Posts: 1521
Loc: Tacoma, Washington USA
Hello again, I've been posting my combo a lot lately because of various questions, sorry for being redundant and please bear with me.

71 charger, 4000lbs with me. I have 15x10 rear wheels, 15x8 fronts. I'll be putting radials up front and getting a pair of radials for back for street driving here in the rainy season

I will also be buying a pair of drag radials for the track (No slicks, I have to drive to track by myself and I will also use the drag radials full time come summer).

My question is, for street driving, what size front radials and what size rear radials would work best with my combo? What size rear drag radials would work best at track? What type of rear shocks do you recommend? Thanx!

Here's my full combo

1973 RB 446, stock solid crank .010 grind, 440 source forged steel rods, L2355F flat top six pack pistons. Balanced cometic head gaskets .039 I believe

Bowl blended port matched aluminum sidewinder heads, milled to 80cc. Valve job 3 angle. 10.5:1 static compression, 8.01:1 dynamic.

PRW #3244012 1.6 ratio roller rockers solid Racer Brown 3 bolt st21 cam duration @50 254in 254ex lift .554in .554ex centerline 104in 108ex, 106 lobe seperation, advanced 3 degrees. Cam degreed in, rollmaster timing set, powerbond PB1112SS balancer

Holley SD intake port matched, bigs stage 7 950hp mechanical secondaries with 78 primes 85 seconds, 4.5 prime power valve, no secondary PV, .033 prime & secondary shooter, .036 idle feeds, .070 idle bleed & .033 main bleed.

Hemi pan, windage tray, 1/2 pick-up melling standard volume pump with lighter spring, jegs valve covers 2 breathers.

1 7/8" tti headers, 3" exhaust, haven't picked mufflers yet but will be high flow

4200 PTC 9.5 converter, solid B&M flex plate 727 rmvb rebuilt with a tranzact kit good to 650hp low band apply and bolt-in sprag

Mini tub, shortened Dana 60, 4.10:1, w/clutch pack not cone, welded on 8 3/4 ends, 31 spline doc diff axles, green bearings

Later A Body front disks, 11x3 rear drums (or 11x2.5 can't remember). Mopar xhd springs with extra pass leaf (already sagging, will prob switch to espo), heavy duty fabricated front spring mounts which also box the frame where we cut and welded them in.

Beefy 2x3 frame connectors that go through floor. Fully rebuilt front suspension with boxes lca's, 1.06 firm feel torsion bars, reinforced k frame with skid plate, strut mount reinforcements, steering box mount reinforcement.

Rebuilt power steering by steer n gear, manual brakes.

#2399333 - 11/06/17 10:50 AM Re: Please help with selecting most effective tire size. [Re: Adam71Charger]
DaytonaTurbo Offline

Registered: 02/26/03
Posts: 21036
Loc: Manitoba, Canada
I would do 235/60R15 up front and 325/50R15 out back. That will give you a bit of rake and the 325's fill up the wheel wells nicely on these 71+ b-bodies. If you've done a mini tub they will fit, however I would expect custom backspacing rims to be needed. The 325/50/15's are a 28" diameter tire. Nitto and BFG have drag radials in this size. For more of a street tire, Mickey Thompson makes their sportsman s/r in 28x12.00-15 which is a little narrower and in terms of construction I think they are a street radial not a drag radial.

#2401749 - 11/11/17 12:14 AM Re: Please help with selecting most effective tire size. [Re: Adam71Charger]
Adam71Charger Offline
pro stock

Registered: 06/01/13
Posts: 1521
Loc: Tacoma, Washington USA
1st we did mini tub, then bought the 15x10 cop wheels from summit. We shortened the dana so the wheels were centered in the tub. So no custom backspacing needed

#2401755 - 11/11/17 12:35 AM Re: Please help with selecting most effective tire size. [Re: Adam71Charger]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 31712
Loc: Bend,OR USA
I ran the 315x60x15 M/T ET Street Radials on my old Duster on both 10 and 12 inch rims, it went 10.00 E.T. at 134.+ MPH a bunch of times on those tires at Woodburn cork up with the full exhaust system and air cleaner on boogie Those tires worked real well at the track up
Not so good on the streets though workThe same size bias ply M/T E.T. Streets worked better on the street and on bad tracks up
On your deal the radials would probably work great during the summer when it quits raining twocents

Edited by Cab_Burge (11/11/17 12:37 AM)
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)


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