4.0 engine head differences over the years

Ecomike · Aug 1, 2016

Found a great photo and article / site on the 4.0 engine heads and the differences over the years!!!

http://www.enginebuildermag.com/2004/10/not-those-jeeps-again-the-facts-about-4-0l-cylinder-heads/

cruiser54 · Aug 1, 2016

Thanks Mike. Bookmarked.

gradon · Aug 1, 2016

Photo 4 of the 0630 is bs. The center exhaust ports don't have a common port. I'll add that early 0630s have the driver-side rear port for the dash gauge temp sender which the 96 uses, some have the port tapped and capped, and later ones just have an untapped boss.

Sent from my iPhone using Tapatalk

Overland · Aug 2, 2016

That boss was tapped at an angle, too. I made a template from my original to locate my center punch on the 0331.

Ecomike · Aug 2, 2016

gradon said:
Photo 4 of the 0630 is bs. The center exhaust ports don't have a common port. I'll add that early 0630s have the driver-side rear port for the dash gauge temp sender which the 96 uses, some have the port tapped and capped, and later ones just have an untapped boss.

Sent from my iPhone using Tapatalk

There are some correction comments, in the lower comments section, on the linked page, comments like yours about errors.

4.0 engine head differences over the years

Ecomike

NAXJA# 2091

cruiser54

NAXJA Forum User

gradon

NAXJA Forum User

Overland

NAXJA Forum User

Ecomike

NAXJA# 2091

Similar threads