Need a better designed oil pan

[Tom Wells]

Originally Posted by cycleguy55

In addition to the reinforcement rails, I also replaced the oil pan bolts with studs and 'flange nuts'. Others may disagree, but IMO the pan is easier to install that way, plus the flange nuts have one way 'teeth' where they meet the pan rails to help prevent loosening.

Cycle,

Couldn't agree more! Studs are way better than bolts for these seals.

Studs also prevent leaks from a more insidious source: bolts that are slightly too long.

If the bolts are too long, you can torque them to spec but they just bottom out in their holes so they don't give the clamping force that is needed to make the seal. You can't see it - the joint probably looks OK - or feel it, but it can allow leaks.

I also use (and recommend) studs for valve covers for the same reason.

Tom