1990 heads on 1986 block?

[kyle1990ranger]

Will my 1990 Ranger heads fit an 86 block?

 

[RonD]

Both from 2.9l, then yes they will, they are better heads as well, the '89 and up heads had stronger casting.

Good read here on 2.9l: http://www.therangerstation.com/tech_library/2_9_Page.shtml

The '86 valve cover may tend to leak on the '90 heads, however if you straighten the edges of the valve covers(so they are flat again) and use a cork gasket(I like cork, some like rubber, your choice), you should be OK, don't over tighten them, that cause the thin metal to bow and leak

 

[kyle1990ranger]

Ok. I need to know because a guy is selling a rebuilt shortblock and my bottom end is bad. The short block is a 86 my truck is a 90