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#1784232 - 06/06/09 08:39 PM Re: usual mods for box CV? [Re: TheBlunderbuss]
88grandmarq Offline

4R70W rebuilder

Registered: 07/10/02
Posts: 6846
Loc: Indiana
I would agree... gears and dual exhaust are the best money spent.
Even E7 head by themselves are an improvement.

my 88 MGM in stock trim ran a best of 17.7 in the 1/4 mile
with E7 heads, Dual exhaust and a 3.27 gear it dropped to 16.9.
2011 P7B - retired Jay county Indiana Sheriffs car
2003 Lincoln Town Car Signature - 3.27 RAR, dual exhaust and J-mod - SOLD 09/2011
89 Crown Victoria LX- HPP Box - SOLD 09/2010
88 Grand Marquis LS - The original - Totaled 5/2006

I rebuild AODE/4R70W/4R75E Transmissions, check out my Facebook page for my latest project;

#1793395 - 06/18/09 09:19 AM Re: usual mods for box CV? [Re: 88grandmarq]
AOD Offline

Grand Poobah

Registered: 12/06/00
Posts: 11509
Loc: Asheville, North Carolina
Most boxes I see on the road have the original springs and shocks, so they sag in the rear and wallow all over the road.

Late-model Crown Victoria Police shocks fit the box body cars (up to 2002) - so I reccomend them. Stiffer Moog springs can be used to help the sag issue.

I vote for dual exhaust as the next best bang for your buck.


'85 2-Door Crown Victoria - Faster than the Sig Police!
302 HO, -0.022" E7 Heads, Weiand Intake, Edelbrock 1406 Carb, Mechanical Fuel Pump, HEI Distributor, 180* T-stat, Shift Kit, HO Governor, Lokar Cables, B&M Torq Master Converter, FRPP Trans Cooler, Mustang Headers, 2.25" Dual Exhaust, Flowtech H-pipe, Hooker AeroChamber Mufflers, 2.5" Side-Exit Exhaust, Police Shocks, Cut PI Front Springs in the Rear, PI Rear Sway Bar, 17" Sport Wheels, 245/50/Z17 Tires, 4.10 Rear End Gears, Trac Lok Diff
'15 Ford Taurus SHO '02 Jeep Liberty '95 Mazda Miata MX-5 '82 Honda MB5 Motorcycle

#4117022 - 08/02/21 10:11 AM Re: usual mods for box CV? [Re: 1990LTD]
papaumau45 Offline

Registered: 07/30/21
Posts: 1
Loc: Massachusetts
Thanks for info. I have 89 CV lo po base engine.
mods so far:
cold air intake
45k volt coil
E3 plugs
Walker dual exhaust 2 inch
performance mufflers/ Thrush
addco 1 inch rear bar
3.55 gears
cop shocks

Shift kit

I have collected:
E7TE heads
HO upper and lower intake with egr and 63mm throttle body
mustang headers
235/60/15 tires and mags
Hydrogen fusion reactor
Blessed by the POPE
HO cam
Besides better jokes; what else is needed?
1989 CVLX 37K new
Sweet car to drive... papaumau45

Thinking of Uprgade to mustang governor...WHICH?

Edited by papaumau45 (08/02/21 10:14 AM)

#4117140 - 08/03/21 09:35 PM Re: usual mods for box CV? [Re: 1990LTD]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 2557
Loc: Cleveland, OH
Sounds like you're on the right track for a full HO upgrade, which will help more with your 3.55 gears. The lopo works best below 2500 RPM, which is gonna be a good trick with 3.55s. Going to the HO setup will match the revs with the powerband a lot better. And yeah, you want a Mustang governor.

I think you need a HO ECU, but I'll let the guys who have actually done the HO swap chime in on that.

1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 56K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.

#4117142 - 08/03/21 09:39 PM Re: usual mods for box CV? [Re: 1990LTD]
Bellwestern80 Offline

CVN Discord: Edsel
Over the Hill

Registered: 07/01/11
Posts: 4064
Loc: Evans, Georgia
HO ECU required for HO swap.

My Cars:
-1964 Mercury Comet 202 (116K Miles | 170 I6) - Restoration Project
-1986 Dodge D-150 Royale SE (112K Miles | 360 V8) - Waiting on a TorqueFlite
-1987 Mercury Colony Park LS (330K Miles | H.O. 302) - March 2017, November 2019, & September 2021 POTM Winner
-1997 Mercury Grand Marquis LS (230K Miles | nPI 4.6) - The Daily Workhorse & April 2013 POTM Winner

#4117198 - 08/04/21 04:22 PM Re: usual mods for box CV? [Re: 1990LTD]
Packman Offline

Registered: 01/17/07
Posts: 850
Loc: Joisey
I replaced the lower intake gasket with a built 5.8L on my '86 CV; if that's considered a mod facepalm
Bop Your head and stomp your feet!
Droppin' it nicely, droppin' it neat!

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