The F case is a 1300 case i think. The best case for a type 1 build is a late dual relief case. They are the ones with 8mm head studs with factory case savers, 8mm studs for the oil pump and other studs. They have larger oil passages.
i rekon if you are gunna chuck a heap of money at go fast bits do yourself a favour and get a new case with all the mods already done at least you dont have to worry about that bit of it,,, old cases are stuffed,,, even if you dont contemplate a hotty it is still worth the investment as it will last not like flogged out old line bored cases.
Yeah i second that. a new AS41 Dual Relief case is the best choice. It is made out of an alloy with higher aluminuim content than the older cases.
Unless its only a cheap throw together, the price of new cases these days is pretty affordable because of the AUD. A good used virgin case wouldn't be that much cheaper anyway. Dont support a few thousand worth of parts on an old case.
yeah, I secon dthe 'new case with thousands of dollar engine' theory. I have had three cases in 10 years - never again. My new 1916 will be built on a new alloy case - I'll probably have it forever