who makes a 4.125" Crank?
TECH Fanatic
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From: Elmhurst, IL (Chicago Suburb)
I would avoid a 4.125 crank like the plague in a 6 litrer ironblock as i speak from personal experience when i tell you not to exceed a 4.00 stroke on the LQ4 as the geometry of the motor will be WAY off, and will cause problems with oil consumption, with your reluctor wheel and with scuffed pistons. Also, avoid a CALLIES crank like the plague as my reluctor wheel on a 4.125 crank on brand new one broke and caused my motor to stall out in high rpms just like pro street john's reluctor wheel problem. ALso, from what have seen and heard, callies obvioulsy does not have the ls1 motor perfected yet and they need to stick with JOHN FORCE"S MOTOR!
Stay with a lunati 4.00 crank on iron motor and use lunati. Also, if going to 4.060 make SURE you sonic test block as many come up to thin on clyinder wall.
BEST OF LUCK!
Stay with a lunati 4.00 crank on iron motor and use lunati. Also, if going to 4.060 make SURE you sonic test block as many come up to thin on clyinder wall.
BEST OF LUCK!
TECH Fanatic
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From: Elmhurst, IL (Chicago Suburb)
Originally Posted by T/A Medic
Thanks man... looks like it will have to be a 4.0 with 4.030 pistons so i dont have to sonic test ****
Also, with the .030 overbore you will have extra thickness should you ever need to rebuild the motor, etc. 
What difference does it make if you use a 4.125 crank in an iron block or an aluminum block. The geometry isn't gonna change between the two. There will be just as much stress on everything in the iron block with a 4.125 crank as there would be with an aluminum block with a 4.125 crank.
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That's what i thought also but was told differently by my engine builder. He said there was a difference with my 4.060 overbore on my LQ4 block vs a resleeved aluminum one. What that difference is i have no clue as i am not a mechanic!
