I pulled the intake and put it on a table flanges down. It rocked. It's at the machine shop now being surfaced. The Langdon cast iron headers do not contact the Offy intake howeveur the flanges on the headers are thicker than those on the intake. I initially secured them to the head with the stock cup washers and grade 5 cap scriews torqued to 24 ft lb. This go I am using grade 8 torqued to 35 lb as Leo Santucci suggests in his book. Any suggestions regarding the cup washers? Thank you.
