Some built questions rb25det

Discuss the RB20, RB25 and RB26 series engines.
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al_v
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Please, can you tell me if this pistons are stock bore or over bored , I´m not sure about that 05????



And what is the tq specs for the arp head studs???????


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Coolwhip
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they're factory pistons.

The extra number is to tell you the various size pistons from factory to compensate the piston to wall clearance between cylinders.

ARP head stud tq specs:

70ft/lbs for ARP Moly Assembly, and 85ft/lbs for use with 30wt motor oil.


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al_v
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Coolwhip wrote:they're factory pistons.

The extra number is to tell you the various size pistons from factory to compensate the piston to wall clearance between cylinders.
I know that , but my question is , are this pistons standard bore or over bored ???
Coolwhip wrote:
ARP head stud tq specs:

70ft/lbs for ARP Moly Assembly, and 85ft/lbs for use with 30wt motor oil.
Thanks for that info.

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Coolwhip
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A list of everything printed on the piston will help.

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al_v
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This are my numbers :




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Coolwhip
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Sorry didn't post the chart, all which is found in the FSM.

Factory piston; Stock Bore


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