Hi,
Looking to get a xc60 or xc90. Headroom and reliability are an issue.
Would appreciate recommendations. The xc60 would be a T6 and the
xc90 would be a 3.2l. Would need approximately 4" to the headliner.
Right now measured 2".
Also found this service bulletin:
fyi-how much more headroom does it give?Anyone know?

https://www.volvoclub.org.uk/faq/InteriorSeats.html


More Headroom Via Lower Seat Cushion. [Inquiry:] I'm suffering from a lack of headroom in my '88 760. I've heard of a TSB about lowering the front seats to gain about 1" to 1.5". My local dealer does not know about it. Can anyone help me identify it, or even better, tell me what it says and whether it's a DIY kind of job?
[Response: Paul Wright] Volvo service bulletin for US and Canada markets TP 31127/1 (English); 09/88; Body Interior, states that From model year 1991, the seat frame springs can be lowered approx. 10-15 mm (about 1/2 inch) to provide increased headroom. The drawing on the service bulletin shows that there are two sets of mounting holes in the seat bottom frame, where the six springs under the cushion hook into the seat frame. The bulletin suggests hooking the springs into the lower series of six holes. I believe there is only one set of mounting holes cut into the pre-1991 seat bottom frames, but it should be possible to drill out some new ones about 1/2" lower, and get the same headroom advantage as is already available on the post-1991 seats.


Regards
Lars