[quote='05TJLWBRUBY]
JayDub said:
rubitx said:
Why not look at a stroker motor? Some additional upper end never hurts the dd but more torque on the low end for play. It's what I would do if mine failed.
I looked long and hard at strokers. I chose not to go with a stroker because a stroker gives a ton of top end at the cost of low end torque (where I use power the most). Ended up with some custom porting, etc for torque, but avoided stroking due to $ cost and torque cost.
Jaydub-
Do you remember the specs on the porting and whatever else you had done? How is it performing for you with some miles on it now and do you notice much of a difference with the mods done, how is it holding up?
I head down to the dealer in the morning after grave shift to pull the CPS/OPDG assembly and replace in their lot to have them re-sync once done. Expecting the worst as this is the SECOND time I've had this done now. The first was brand new off the lot with less than 1000 miles on it. That repair ended up as a total rebuild with new cam, crank, rods, lifters, etc., etc. Expecting the worst, I'm really hoping it doesn't come to that for the second time but if it does, thinking maybe I'd have some head work done, look at other cams and see what kind of "mild" changes can be made while it's apart. Just curious what you've done overall, specs, and how it's performing compared to the factory 4.0. Thanks for the info.
Best of Luck,
Mike[/quote]
Here is the thread:
viewtopic.php?f=23&t=67860&hilit=install+4.0
Here is the spec on my build:
Parts list (format to be quantity / part number & description)
1/H825CP .030 Pistons
1/E234K .030 Moly Rings
1/GC609P .010 Rod Bearings
1/MS1947P .010 Main bearings
1/N7 Cam Bearings
1/3161 Timing Set
1/M81A Oil Pump
1/MPE256BR Brass Soft Plugs
1/MC1377 Cam
12/HA2011 Lifters
1/HS26211 Gaskets
1/CS8169-4 Gaskets
1/ES71102 head bolts
12/Brass Valve Guides
12/VS1456 springs
6/break-in oil (SAE 30 Valvoline Non-Detergent) Part number VV265
1/#159 Oil Additive (Comp Cams Engine Break In Oil Additive) Good for CAM BAD for Catalytic converters.
Labor list:
Bore 6 Cyl
R&R 6 Connecting Rods
Valve Job 6 Cyl
Install Guides 6 Cyl
Crankshaft Grind
Install Cam Bearing
Re-size big end of Rods
Surfave 6 Cyl Head
Degrease Block only (he actually did extra cleaning and de-greasing for me)
Disassemble
Assemble 6 Cyl Long Block
R&R Rod Bolts
Install Soft Plugs
Computer Balance
Port work head and intake (this was a mild port match for the Borla headers I bought) Intention on the porting was to maximize torque.
Port information:
25" Water
3.975 Adapter
Format to be Lift/Stock Intake/Ported Intake/Stock Exhaust/Ported Exhaust
200/86/94/69/76
300/110.5/118/84/97
400/142/159/96/119
500/159/170.5/121/134
550/168/179.5/124/146
Average 76% gain. Port guy said 28 HP gain with 34 Ft.Lbs of Torque. Any more aggressive proting or polishing would have added high RPM horsepower at the cost of Low RPM torque so he stopped.
Porting was done via a local shop who does custom work based on each specific motor on the table.