Hey everyone getting ready to replace my "head" on my 1990 4.0.. Questions on the bolts for the head- ARP. Needs specifics for size and wants to know if there all the same size. 1/2" or 7/16 ? Are they all the same size?

There's a set on Amazon Magnum cylinder head bolt set – 14 piece part number HB 33004 just wondering if these will be OK?

I don't want to cheap out but I just want to know if these will be OK guess they're from Taiwan??

Also does anyone know the size bolts for the thermostat housing ?1990 4.0 tc. 242 or a link would be helpful. Thanks again for all information very greatful !!

 

Those appear to be the correct bolts. Note they use a different socket than the OEM's.
Taiwan is fine, skip the Chinese head bolts. (avoid Chinese fasteners of any sort)

Thermostat housing bolts are SAE 5/16-18 x .970" You'll probably have to purchase a 1" and either grind it down or stack a few washers.

 

Thanks Radi, should I go with ARP. For" head bolts "just to be safe?

 

You certainly can if you like, I don't see anything wrong with the set you picked above either. I've sometimes just re-used the OEM set as long as they aren't torque-to-yield and it's the first re-use.

 

Got it, yea already ordered the set just wanted to be sure and get someone else's opinion thanks.

Hey would you or someone happen to have the link/ for a head cylinder replacement??? 1990 4.0 tc 242 i6 xj Head casting number 2686


Have a reman on the way and have most of what I need for this job besides another case of oil-
And antifreeze, to fill back up for that 4 hr ride once it's done, across the Desert.

Thanks to everyone for any and all help!