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Old 04-02-2010, 08:18 PM   #33
Scooby Specialist
Member#: 115070
Join Date: May 2006
Chapter/Region: MAIC
Location: Northern VA
2009 DGM LGT Spec.B
08 Audi Q7 4.2 PRM


Originally Posted by romanlynch View Post
well i was thinking of 79mm crank, sti rods, custom pistons 96.5 or 97mm i guess, i havent started researching this yet as i just came across the engine yesterday and am picking it up tomorrow. whats the difference between the d, v, s heads? also when i go to order the pistons do i need to specify "stroker"? what would the difference be, the location of the pin?
The OEM bore is 96.9 mm so if you get 96.5 mm pistons you're going to be in trouble... 97 mm are .10 mm (.004) over. Standard method is to go drop in, .5 mm or 1 mm over the bore. FSM states max overbore at .5 mm...

You can't drop in an STI crank into a phase 1 block. Phase 1 is thrust on #3. The STI crank is phase II thrust on #5. You would have to machine either the block or the crank to fit...

If you were to machine for the STI crank the piston pin height would have to be raised 2 mm.

Not sure exactly what you mean with the heads. What's available for use on these are WRX (S20) castings either shimless bucket or shim over bucket. If you have an 02-05 2l WRX those are the heads you have.

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Last edited by soobaviator; 04-02-2010 at 08:40 PM.
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