My 23 pan is bent bad at the 4th main. The guy straightening it says that he has a 4 dip pan to replace it. Can the pans interchange, is there a problem doing it?
The pans can interchange and the 4 dip pan will give you better access to the #4 rod when it comes time to adjust the rod bearing. If you're not concerned with year model correctness as a show car would be, I'd do it.
Be sure to also use the corner reinforcements that came with the "improved" cars. I have no connection to the attached listing, just putting the link in to show what they look like:
Not a good idea unless you use the late hogshead with the ears that connect with the block. Brackets
help..but there are straps too which need to be part of the hogshead installation.
The 4 dip pan is weakened by the design and allows flexing which is said to cause crankshaft failures.
For the average T driver a 4 dip will work fine.
A lot of T's have the made the 'upgrade'.
If you want to build a speedster and hop up the engine you might want to use the earlier pan.
I realize that using the late hogshead makes no sense with an early block and transmission...just trying to say that the weakened pan was compensated for by a number of other changes.
Langs has a stock of used 3 dip pans Tom. You are close to them, I would use one of those.
When Martynn Vowell and I were tearing down Derrick Pang's Runabout we changed to a 4dip no problem.
How about adding a belly strap under the oil pan for extra support?