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LH Performance Modification Discussions
 #369660  by Trevorusn
 October 2nd, 2017, 8:42 pm
Awesome thread, would love some 0-60 times if no dyno. Sounds quite promising.
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 #369663  by remi
 October 3rd, 2017, 3:41 am
Old thread but still interesting, I'd love to get some numbers too! Would it worth it, that's the question ^^
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 #369773  by TrueBlue
 October 10th, 2017, 3:19 pm
Sadly he sold the car, I used to occasionally see the car around town but not recently.
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 #369860  by remi
 October 16th, 2017, 12:52 pm
And nobody else has ever done this mod?
I'm seriously considering doing a 4.0L stroker in 2018 and considering the money involved I'd like to know the gains ;)

Sent from my ASUS_Z012DA using Tapatalk
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 #369920  by carlrs
 October 20th, 2017, 6:37 am
I'd also love to do a 4.0 build one of these years, but I guess just 4.0 cams would be more feasible for now. No idea how much it would cost, though. I assume that for cams, a good set of used ones from a crashed Nitro or Pacifica would do?
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 #369929  by FIREM
 October 20th, 2017, 11:55 am
While there may be some gains, I'm guessing it may not be much. Anything that helps and is reasonable, such as spacers and throttle bodies, did catch on and many followed. Cam swap is a BIG job if you are considering it. Cost of new part$ probably crazy money. Used parts are just that used and you must get the cams and matching rockers. Mixing roller rockers on used cams will usually wipe out the cam in short order. Cams come out the rear of the heads, so the heads have to be removed from the engine for this mod. A rather involved job. Personally I would rather pull the engine and do the swap on an engine stand, rather then bending over the fenders to pull heads.
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 #369948  by remi
 October 21st, 2017, 7:14 am
Bob, you're right it's a hell of a job.
Cams run around $300 on RockAuto, band new Mopar ones. Crankshaft doesn't cost much more than that, tho some major work must be done to fit a 4.0 crank in a 3.5 block, labour won't be cheap for this!
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 #369952  by FIREM
 October 21st, 2017, 10:43 am
Thread is discussion of 4.0 cams in a 3.5. Building a 4.0 Stroker is way way more involved and co$t lot$
http://300mclub.org/forums/viewtopic.ph ... oker+build
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 #369968  by remi
 October 22nd, 2017, 9:25 am
Yes that's a lot of work... I've read the entire thread on DI.net also, there're a lot of information. As I might come to Carlisle this year, I might bring some parts back in France in my backpack ;)
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 #370046  by TrueBlue
 October 26th, 2017, 10:45 am
I have my dead 3.5 on a stand, maybe I should yank the heads, hot tank 'em, grab some 4.0 cams and sell them as an assembly. (or even put them on my Special, someday...)
Hell, maybe I could put Matt (thread starter) out of his 300Mretirement, lol. He still lives local to me and is a Mopar master tech now.
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 #371435  by Mopar1
 January 13th, 2018, 9:20 pm
I drove Matt's car when it was for sale, I doubt it had anything over a stock 3.5 and maybe less, in fact as those cams where made with a different tune, Intake, fuel amount and purpose in mind...just a thought...
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 #371444  by remi
 January 14th, 2018, 12:54 pm
That's frustrating but expected I guess...
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 #371493  by TrueBlue
 January 16th, 2018, 10:42 am
Mopar1 wrote: January 13th, 2018, 9:20 pm I drove Matt's car when it was for sale
Are you local to NY? I'm assuming so?
I'd love to see this:
03 Special 29K Black Crystal Pearl on Black - 99% Perfect Car - Garage Queen - Always stored in climate controlled environment - Original down to the tires.
02 Special 103K Safire Blue on Black
02 Special 80K Black on Tan.
02 Special 140K Black on Black - New 60K Engine (Previous owner thru rod bearing)
02 Special 77K Black on Black - Parts car all intact.
Anyway - I can't vouch for any gains / butt dyno, never drove it.
It would be beneficial to see the cam specs for both engines, but the tuning would play a role in getting the max outta the investment.
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 #371495  by remi
 January 16th, 2018, 1:15 pm
TrueBlue wrote: January 16th, 2018, 10:42 am It would be beneficial to see the cam specs for both engines, but the tuning would play a role in getting the max outta the investment.

Quoted from Matthew's original post, slightly modified for more readability ;)
mlasms08 wrote: February 27th, 2013, 9:50 pm 4593616aa,4593618aa are cams, 4792580ac,4792025ab are sprockets. Less than 250 retail for all. 1 3.5 cam retails for 300

4.0L
CAMSHAFT
DESCRIPTION SPECIFICATIONS
Bore Diameter 43.038-43.059 mm 1.6944-1.6953 in.
Diametrical Clearance 0.078-0.12 mm 0.003-0.0047 in.
Diametrical Clearance (MAX) 0.15 mm 0.0059 in.
Bearing Journal Diameter 42.939-42.960 mm 1.6905-1.6913 in.
End Play 0.05-0.51 mm 0.002-0.020 in.


VALVE TIMING-INTAKE VALVE
DESCRIPTION SPECIFICATIONS (CRANKSHAFT DEGREES)
Opens 4° BTDC (A) - 1° ATDC (B)
Closes (ABDC) 60° (A) - 65° (B)
Duration 244°
Centerline 118° (A) - 123° (B)

VALVE TIMING-EXHAUST VALVE
DESCRIPTION SPECIFICATIONS (CRANKSHAFT DEGREES)
Opens (BBDC) 61°
Closes (ATDC) 21°
Duration 262°
Centerline 110°


3.5L
CAMSHAFT
DESCRIPTION SPECIFICATIONS
Bore Diameter 43.038-43.059 mm (1.6944-1.6952 in.)
Bearing Journal Diameter 42.939-42.960 mm (1.6905-1.6913 in.)
Diametrical Clearance 0.078-0.12 mm (0.003-0.0047 in.) - (Max.) 0.15 mm (0.0059 in.)
End Play 0.11-0.35 mm (0.004-0.014 in.)

VALVE TIMING-INTAKE VALVE
DESCRIPTION SPECIFICATIONS (CRANKSHAFT DEGREES)
Opens (ATDC) 3°
Closes (ABDC) 61°
Duration 238°
Centerline 122°

VALVE TIMING-EXHAUST VALVE
DESCRIPTION SPECIFICATIONS (CRANKSHAFT DEGREES)
Opens (BBDC) 56°
Closes (ATDC) 16°
Duration 252°
Centerline 112°
Valve Overlap 13°
 #371535  by snstr_auto
 January 18th, 2018, 12:14 pm
I will have to look at the 4L specs vs the specs for the 'Stage 2' SRT4 cams that I was going to get from a set of spare 3.5 cams. Downside, while I will be able to 'tune' for the cams, there will be definite other factors to consider if I do them.