airplane engines have small cooloing fins, because a lot of wind is always rushing past them when they run. putting one in your car may run, but it will overheat, unless you Find a way to cool it. i recently experimented by puting a airplane engine in my maxx, and found that larger size engines fit, but, with the engine i had , it only ran for 10 minutes before it reached scortching temps of 367 degrees! unless you find a effecient way to cool a airplane angine inside a truck, i strongly urge you NOT to get one of those. buy a real ,engine meant for cars with the large fins, or try to get another head for it. ( i saw that thread)

good luck