they did , but 413 and 400 were in the motorhomes and big truck, they have those water pumper heads on them , if you ill git it later , tripped me out to when i got it last week. but yeah the 413 was around in the 70s just a low compression motor , the best way to do some resurce is on 440 source orig parts http://www.440source.com/timingcovers.htm check out the timing cover on the bottom http://www.440source.com/wpumphousings.htm the huge water pump housing in their is in the 413 to
