I posted the pics in the B29 forum, and the veterans who flew the plane said the big turbocharger on the exhaust stacks would heat up and glow cherry red. Quite a sight to see at night when contrasted with the normal blue exhaust flame.
They also said one of the great things thy remembered seeing the B29's take off from their bases in the Mariana's...... B29's taking off every 30 seconds from the parallel runways all streaming flame from the exhaust as they were on rich mixture for takeoff.