3.4 to 3.6 using 997 3.8 99mm pistons

[BoxsterSteve]

There's also another measurement, although I forget the proper medical term... It's the measurement of wristpin centre relative to the piston top.
In some stroker motor situations, stock pistons can extend out of the bore @ TDC without a specially made piston set. I'm not sure if it applies in your example, but it did back in the day building a 347 stroker out of a Fox body Mustang's 302 V8.

[BYprodriver]

Originally Posted by BoxsterSteve

There's also another measurement, although I forget the proper medical term... It's the measurement of wristpin centre relative to the piston top.
In some stroker motor situations, stock pistons can extend out of the bore @ TDC without a specially made piston set. I'm not sure if it applies in your example, but it did back in the day building a 347 stroker out of a Fox body Mustang's 302 V8.

Piston pin height is the simplest term. When you are "stroking" a engine for max swept area volume & thus max displacement you install a crankshaft with longer "throws". Porsche did this in 2002 with the new 3.6L engine. To offset the additional length of the crank stroke the 3.6L has shorter rods & revised pin height pistons.
In the OP's case the pin height will be off & the piston valve pockets & dome will be a different design. This is one of the reasons LN designed the new pistons for this application.

[seningen]

Originally Posted by BYprodriver

Piston pin height is the simplest term. When you are "stroking" a engine for max swept area volume & thus max displacement you install a crankshaft with longer "throws". Porsche did this in 2002 with the new 3.6L engine. To offset the additional length of the crank stroke the 3.6L has shorter rods & revised pin height pistons.
In the OP's case the pin height will be off & the piston valve pockets & dome will be a different design. This is one of the reasons LN designed the new pistons for this application.

deleted -- had my logic backwards

[BoxsterSteve]

Originally Posted by BYprodriver

Piston pin height is the simplest term. When you are "stroking" a engine for max swept area volume & thus max displacement you install a crankshaft with longer "throws". Porsche did this in 2002 with the new 3.6L engine. To offset the additional length of the crank stroke the 3.6L has shorter rods & revised pin height pistons.
In the OP's case the pin height will be off & the piston valve pockets & dome will be a different design. This is one of the reasons LN designed the new pistons for this application.

That's the term I was hunting for. I knew someone in the brain trust would be able to say it, even though all I could manage was to charade it out...

[Jake Raby]

The learning curve with this is 90 degrees.
Cylinder preparation and ring pack are the main considerations, as well as running clearances.

Its all in the combo, not just a bigger piston, or a forged piston.