1997 Ford Ranger 4.0 OHV head replacement

[cal74]

I recently replaced the heads on a 2000 Ford Ranger 4.0 and looking to sell that and have a 1997 project truck waiting.

I've seen some references where in 1998 the heads may have changed? I'm looking at these heads on feebay (unless someone has a better source) and they say 1997 and up? Is that correct?

Thanks for the help

 

[RonD]

This article: http://www.therangerstation.com/tech_library/40rebuild.shtml

Explains the differences in the heads, 1998-2000 had narrower exhaust ports to increase velocity of exhaust exiting the cylinder, this increased heating up of Cat converters faster for lower emissions