I have used it to help flow a case or two, and more recently to correct the roof of an intake port on a "110" iron sleeve engine. The sleeve protruded down into the intake port, but the port timing on the sleeve was perfect and the port itself was actually bad. I filled the roof and shaped it to be even with the sleeve edge and ramped it up. This allowed me to drop the intake port floor and get way better intake timing while reducing a lot of turbulence.You know, that is a great idea… I’ve actually done that on other projects ( ie. most recently, filling a hole i drilled in something I shouldn’t have)
Don’t know why it didn’t cross my mind to do that last night. I know some people have used it to stuff cases, even getting creative using it while porting heads. Some question reliability when used in the cylinder but seems there been quite a few cases it seemed to work well.
Anyway thank you the tip, I obviously would have completely forgot otherwise.
I just don't use a ton of it like I have seen other people. I watched a video not too long ago where a person put two entire packages of JB Weld into a case. The most I have thought about using was to fill in the unused transfer ports on the case side of my Phantom, and to help ramp the case to the bore around the perimeter. I just never got around to it because the motor is more than fine without any of that.