The HK B-17F & G are really nice kits. Much nicer than the venerable Monogram B-17G and the Revell B-17F, however there are some areas where I prefer the older kit. One of those areas is the engines.
There are a variety of companies that have made update sets for the engines. For me the best and easiest to use is this Aires set.
Packaged in the typical Aires cardboard box are four beautiful engines. The detail is exceptional with the cooling fins on the cylinders being the deal cincher for me. Included in the box are the four engines and four ‘banks’ of push rods with plenty of extras. There are also four spacers included. Also in the box is a fret of brass ignition leads for the cylinders. Illustrated instructions are also included.