As an update. Installed another 1025 and a 50mm waste gate with a 4lb. spring and went racing. 1st pass was a 13.50 at 4lbs. with the boost retard set at 3 degrees. Second pass was just a little quicker at 13.46. These were both at 30 degrees locked timing. For the third pass I turned off the boost retard and ran 12.67. Fourth pass I turned the boost up to 5lbs. and ran a 12.43 at 110 mph. Fifth pass was the same and then pop goes the head gasket on the 6th pass. On all runs the afrs were in the 10.50 range and egts were in the 1200 degree range at the line. This morning I bit the bullet and ordered a cometic gasket. They assured me it would handle the boost. Oh well what do they sayabout doing things the same and expecting different results? Also these were run on 110 race gas. Try it again next week.
