Welding behind number 3?

[stealth67vw]

Sure. If you cook the motor like a mid 70s fuelie smog motor, weld it. If you can tune and don't cook your motor, no need.
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John Bates
JB Machining Services
1967 street Bug 2276 w/ 48 IDAs, 2050lbs with driver
7.76 @ 89.55mph 1/8 mile
12.27 @ 109.56 mph 1/4 mile

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[joescoolcustoms]

My machinist heats up the case for about 6 hours in an oven (? Temp), welds the plate in behind # 3, puts the case back into the oven, turns the oven off and lets cool overnight slowly.

He has done 4 cases for me and I cannot measure any heat damage to the main bearing adjacent to the patch. I am measuring to 0.0005 inch.

I have measured the thickness of the step cut of a 94 mm hole to the #3 area and I remember it only being 0.090 to 0.095 inch thick. No wonder it could crack, exspecially if you have not balanced the engine and the high RPM vibrations can cause a crack.
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Bad News Racing 2018 NORRA 1000 3rd in Class
Best Day Ever Racing 2022 NORRA 1000 2nd in Class and first All Female team to complete the race

Everyone is gifted. Some just do not open the package.

Looks like it was painted with a live chicken,polished with a brick and buffed with a pine cone

[Jimmy111]

Generally you heat it up to about 400 degrees then weld it. However it will still lose the heat treatment in the area surrounding the weld. This might be a good thing in that location because it makes the material in that area more ductile.