Back when I was a go-fur at a Chrysler dealer, the rule of thumb was to snug it down, then a quarter turn as the gasket seats.
Also it helps to do them hot to avoid breaking as some alloy heads can back the insert out.
2010 Honda Insight 43/79mpg
3000k 35 watt fogs, 50 watt highs
4300k 35 watt low, DRLs/Rear Wiper removed
Full HIDs with Relay kits/ Kenwood KFC 1662s
Tanabe nf lowering springs, 1 inch bump stops
2x Alpine M450s and 12 E Subs /10 Farad Cap
35% tint/LED lamp upgrade, 5mm wheel spacers
09 fit progress rear sway bar, OEM block heater
Full gril block/ KN Filter/ Quarter Bra