i am looking to do a stroker build and i need to acquire a crankshaft from a 4.2l, its the 3.895" stroke crankshaft. i cant find anywhere online to order one, does anybody have any ideas?

 

you order a stock crank for a 4.2... autozone or wherever...

 

If you cant find one at your local autozone, try Scat crankshafts, they just started making them new, do to high demand for jeep strokers, dont forget you will need the rods from a 4.2 also. I was going to go this route also but decided to do a turbo set-up instead.

 

http://lmgtfy.com/?q=amc+4.2+crankshaft

 

junkyard

Year.........Casting No......Description
1971.........3199738.........For Borg Warner automatic
1972-80...3214723.........12 counterweights, 66lb, 64mm nose
1981-86...3235477.........4 counterweights, 46lb, 64mm nose
1987-90...3727...............4 counterweights, 46lb, 54mm nose

 

ive never looked into doing a stroker myself because ive read of them not being as reliable and most people wishing they hadnt wasted the money but i didnt know there were different versions of the cranks? is there one thats considered to be better? just for my knowledge?

 

Having wasted countless hours and thousands of dollars on my stroker I feel exceptionaly qualified to to confirm what you've heard. Reliability is sorely lacking.

To answer your question, the 12 cw is the best choice for a crawler. The added weight comes in handy for low speed crawling and works exceptionaly well ahead of a manual tranny.

If being built for higher reving applications, stick with the 4cw crank.

 

ah... thanks... was just wondering... it would be nice to have if it held up... 350's are a better choice then any in my opinion... cheaper too...

 

350? not really.
This one is...
<----<<<<

 

^^^ to much money... lol... it would be nice yes... ive got the 5.3 in my 2010 silverado and i likes it...

 

I paid $850 for the complete engine, tranny, complete vehicle harness, PCM and all of the assorted modules. Drives like a dream.

 

what the freak... you got a buddy somewhere... maybe i should give my buddy at LKQ a call? lol

 

So if a stroker is not the greatest way to go what about de- stroking? Know that if you take a 327 sbc block and put a 283 crank into it you create the GM 302 sbc that was in the late 60's Camaro's. Has anyone looked into doing this?

 

Can you please explain the lack of reliability?

I don't think that'd be a good choice.

What crank would you use?

 

is the 54 or 64 mm nose better or does it not matter. I just so happen to have a spare 82 4.2 motor kicking it at my homestead. Figgured if/when my 4.0 ever needs a rebuilding i wouldn't mind stroking it then, Just don't really want to go out of my way to do it.