I Read somewhere on here that a 4.0 ltr thermostat housing will bolt up to a 258 block with no extra mods! Is this true??? Reason is I think the 4 ltr one has a port for a temp gauge, and that's what I need since I can't find a place to put my aftermarket mech temp gauge fitting.. I have a header so there is no place to put my fitting!
To thanks guys, you read my mind in this cause I have been wondering the same thing. I too want the t-stat with the opening for a temp gauge. Hesco has one with two openings....you could run ur fans and a temp gauge.....awww sh!#
I pulled a 4.0 housing off of a jeep Cherokee today at the salvage yard to have the tapped hole for a temp sensor. I installed in on my 1980 258, but I have some concerns about it. The outlet neck angles back toward the engine and is so close to the valve cover, I barely have the hose clamp on the neck. The 258 housing does not angle back. The flow is also very restricted compared to the 258 housing. I'm wondering if I got the wrong housing.