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Old 12-07-2011, 01:20 AM   #1 (permalink)
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Cleveland TRW 2408 Piston Forging

Does anyone know if the TRW 2408 and TRW 2348 share the same forging? I know from previous experience that TRW used the same forging for the 2379 flat top and the discontinued dish top, so I thought they may have used the same logic with the 2 lumpy top cleveland pistons. The reason I ask is that I picked up a NOS set of TRW 2408 and want to use them in a 4V closed chamber application.

The underside of both pistons look the same. The dome opposite the spark plug on the 2408 can be ground off as the underside has miles of meat in it. That just leaves the bevelling of the edge around the spark plug dome to make it the same as a 2348. I'm less sure about this area as the underside of the crown is ressessed in this area.

Does anyone have any ideas?
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Old 12-07-2011, 05:14 AM   #2 (permalink)
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Re: Cleveland TRW 2408 Piston Forging

Quote:
Originally Posted by xafalcon View Post
Does anyone know if the TRW 2408 and TRW 2348 share the same forging? I know from previous experience that TRW used the same forging for the 2379 flat top and the discontinued dish top, so I thought they may have used the same logic with the 2 lumpy top cleveland pistons. The reason I ask is that I picked up a NOS set of TRW 2408 and want to use them in a 4V closed chamber application.

The underside of both pistons look the same. The dome opposite the spark plug on the 2408 can be ground off as the underside has miles of meat in it. That just leaves the bevelling of the edge around the spark plug dome to make it the same as a 2348. I'm less sure about this area as the underside of the crown is ressessed in this area.

Does anyone have any ideas?
not the same forging .
you have them in hand . means you know what can and can't be done to fit
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Old 12-07-2011, 11:09 PM   #3 (permalink)
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Re: Cleveland TRW 2408 Piston Forging

Having them both in front of me doesn't give me enough confidence to go ahead and cut up a good set of pistons - that's why I asked the question. I have no idea how much meat will remain in the dome by the spark plug once I bevel the edge to match the closed chamber dome piston.

They do look the same underneath, but if they aren't the same forging then I best leave them alone.
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Old 12-08-2011, 01:53 AM   #4 (permalink)
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Re: Cleveland TRW 2408 Piston Forging

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Originally Posted by xafalcon View Post
Having them both in front of me doesn't give me enough confidence to go ahead and cut up a good set of pistons - that's why I asked the question. I have no idea how much meat will remain in the dome by the spark plug once I bevel the edge to match the closed chamber dome piston.

They do look the same underneath, but if they aren't the same forging then I best leave them alone.
They are not the same forging
the flat top and dish pistons you know about , they also are not the same forging ,
TRW/SpeedPro doesnt machine the piston deck for type

Last edited by DanH; 12-08-2011 at 01:59 AM.
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