The only Toyota that I know of with a engine size of 4.2 Liters, is the old Landcruiser, I beleive about 1989. This had a diesel motor, which was a straight six, not a V-8. It came turbocharged and came in either SOHC or DOHC models, and the one with the most power was the turbo-diesel motor with the intercooler which had just under 200HP.
So, if you are talking about Toyota engines that are 4.2 Liters, that is the only one I can think of, but it is not a V-8.
Toyota made several V-8 motors that are close to 4.2 liters, but not exactly. A few Lexus sedans have had a 4.3 liter V-8. Some Lexus sedans and Toyota trucks also had a 4.6 Liter V-8
If you are thinking of something different, please add more information and I can try to help you out more. Good Luck
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