When we built our 240 rally car, we picked up a pair of front springs from a 260 to raise up the front end. It lifted the car about 2". If you want stock ride height, some 4 cyl springs are called for.

Skip
'93 850GLT
'83 242TI Flathood

The V6 was NOT heavier than the four cylinder engines, mostly because of the all alloy design (compared to Volvo's own iron cast engines) but also because of the over all weaker french construction philosophy, as we've learned through the years... Actually it was a tad lighter but six cylinder cars were loaded with other stuff and therefore heavier in the end anyway.

Automatics were heavy enough (compared to manual 4-speeds) to justify other spring ratings from the factory, though. This is a matter of personal preferences - just remember that new springs could feel pretty harsh when replacing old, soft ones. Handling will almost certainly be improved while comfort might not.

Btw - don't mix this up with the VW/Audi inline diesel six which was a lot heavier than the other 240 setups.

Martin
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'65 121, '73 165

As before stated, ride does not appear to be changed, but car sits taller. I put diesel front springs in my old 78 because the 4 cyl springs were tired. It just sat taller.

dick

Maybe not ride quality, but they would set the car higher as the 6 is heavier than the 4.