I am having the hardest time fitting the upper dipstick tube on my 72' 400 SBC.
I have tried 2 different OEM upper tubes that should work for this application and neither one will fit tightly.
It's almost as if either the block was machined incorrectly or someone opened up the hole at some point. The bore of where the tube fits looks well machined so I have a hard time believing someone did it after the fact.
Unfortunately, the engine was purchased loose and there was no dipstick tube when I received it so I have nothing to compare.
Any suggestions on how I can either modify the tube or fashion some sort of seal so that this tube will fit snugly and not pull out with the dipstick?
Has anyone else ever run into this issue?