Machine for big bore pistons

Machine for big bore pistons

Why do you need this?

• When upgrading your engine you may be installing oversized pistons and liners
• When upgrading to a 4.1 using our 103.6 pistons and liners you’ll need to have the case machined
• These have a larger liner on the OD that requires boring of the block and liner carriers.

What is this for?

• This is labor only for machining 996tt, 997.1TT blocks and liner carriers
• No parts are included in this pricing.

What is the process?

• The blocks are cleaned and fixtured,  to precisely locate and align the oem bores
• We find the used blocks to be slightly shrunk after use and not aligning to a standard 118mm bore pattern
• This is repaired when updating to the larger bore
• The liner carriers are carefully milled along with the blocks to ensure precise alignment
• Most are finished at 109mm bore diameter vs. 107mm oem.  Custom sizes can be accomodated.

For Head stud Machining, click here