Sump Studs v Bolts

[Charles P]

I have a "semi-deep" aluminium sump on my car and use studs. You need to relieve a front corners a little (less than an 1/8") to make it removeable with the engine in situ.
I learnt this the hard way in the paddock at Wiscombe Park over lunch. On that occasion I had to loosen the front engine mounting bolts and use tyre lever to get it off.
It went back together and I still made the afternoon runs