Well since nobody else has helped, I will try. I checked the drawing for the block in question, and its cast from plain old 356, heat treated to the T-6 condition. So that means:
1-Preheat to 275 F for about an hour
2-Weld using 4043 filler and limit the amperage to about 200
3-Return to the oven for an additional hour after welding, then let it cool in the oven after turning it off.
This is a common practice to weld on 356 engine castings, done all the time on aircraft engines, and automotive. Good Luck!
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11-05-2008, 09:02 AM #11"Better Metalworking Through Research"
Miller Dynasty 300DX
Miller Dynasty 200DX
Miller Spectrum 375 extreme
Miller Millermatic Passport
Miller Spot Welder
Motor-Guard stud welder
Smith, Meco, Oxweld , Cronatron, Harris, Victor, National, Prest-o-weld, Prest-o-lite, Marquette, Century Aircraft, Craftsman, Goss, Uniweld, Purox, Linde, Eutectic, and Dillon welding torches from 1909 to Present. (58 total)