Quote:
Originally Posted by Christ
As soon as you get it, remove the head and get a ARP stud kit. There isn't one specifically for that engine with the 11mm head bolts, but they can build a kit for you that will work.
Barring that, you can also get some threaded rod in the grade 8, cut it to size, and use that in the same way.
The problem with the head bolts is that the recess in the block is a blind hole and very close to an oil galley or water jacket or something... it cracks when you overtighten the bolt, which basically everyone does.
Don't trust 'I wont overtighten it'... just replace the bolts with studs. Unless you want to research which hole cracks and trim that bolt down by about 3-4 threads so it doesn't contact the bottom of the blind hole. The other option is lots of machine work to finish drilling that hole all the way through and apply sealant to the threads of that bolt when you install it.
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If you had an 81 or newer, I'd sell you my head studs. At least i think they are for the 81+. I'll have to look. Even back then, head bolt torque was a concern. My parents had a 78 diesel 2door that would get 48-49mpg. They ran 23.5 CR, a half-point higher than the 1.6s, and they'd rev just a touch higher.
Make sure the bottoms of the bolt holes are well cleaned out with a bottoming tap before running the head studs down..or you'll hydro lock any fluid at the bottom of the holes and CRACK!