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Old Jan 30, 2007 | 12:37 PM
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Default Stroker kit

I have 6.125 Rods and -9cc Mahle Pistons.. Im 99% sure I have a spun bearing.. If I decide to go back with a 4.00 inch crank can I use what I have already?

Will it change the compression?

If so what all do I need to change.

If not I will need:

Crank
New Rod and Crank bearings
New Rings?

Anything else?
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Old Jan 30, 2007 | 12:40 PM
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Pistons are specific to stroke and rod length.
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Old Jan 30, 2007 | 12:40 PM
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Ok well I see I will need new -30cc pistions to keep my 9.5 compresson
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Old Jan 30, 2007 | 02:42 PM
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or get bigger cc heads...
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Old Jan 30, 2007 | 02:52 PM
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I would probably lose more money on swapping the heads. There cnc ported and hand ported by Bo for FI.. I would probably lose 2-3 hundred on them..

The Pistons have 1500 miles on them.. I assume I would lose about 100 or so on them..

Hmm wait.. If I didnt change pistons that would save machine show money also.. Ill have to figure out which is cheaper..
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Old Jan 30, 2007 | 05:16 PM
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you will be able to reuse your rods but if you don't have a 4" stroke crank to begin with your pistons will be way out of the deck.you still running the stock 3.622" stroke crank ?
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Old Jan 30, 2007 | 06:02 PM
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Yeah I have the 3.633" right now.. I want to go to the 4" crank.. Cant you change the wrist pin place? Either way it would change my compression which is bad.
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Old Jan 30, 2007 | 07:33 PM
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That must have cost a fortune to get a custom 3.633 crank!!! (Stock is 3.622).

No, you can't change the wrist pin location on the piston. Are you effin serious? If you get a bigger stroke crank, you need new pistons.

You can change your compression with the piston dish and with head cc's.
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Old Jan 30, 2007 | 08:03 PM
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Nah.. Had a friend do it pretty cheap. Most people say the small change isnt worth it but hey every little bit helps huh. lol

I didnt know anything about changing pin location either but a sponcer on here told me thats all I needed to do.
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