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Thank you all for the suggestions. I plan to do a leak down test later this week. The noted fuel is only when the throttle is opened. I don't remember whether this engine was rebuilt with adjustable lifters. I had a second flathead built by H&H at that time and I am not sure which one had them. Would insufficient valve clearance be a possible cause? It seems that the nearly identical readings in all 8 cylinders would be awfully coincidental without some common problem.
Unfortunately, I have moved away from the area where the rebuild was done and lost most of the paperwork on the build. I plan on calling the shop to see whether they may have some records in their files re.the work done