Do all OHV 4.0 engines have catalytic convertors in the y-pipe?

[ranger7ltr]

After just replacing the engine in my 99 Explorer I want to replace the catalytic convertors on this truck since they seemed clogged up and have 169k on them...I was checking with Ford on the y-pipe and they do not stock it anyway so buying it there wasn't going to happen...

I was wondering what other vehicles might have this same configuration because I am looking to replace the original cats with high flow Thunderbolts and I need a spare pipe to cut up and weld up to install...

 

[mrboyle]

Short answer, yes all OHV's have cats in the y-pipe.