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Author Topic:   cylinder head repair
Dirt Forum Racer

Total posts: 87
posted May 16, 2002 10:56 AM
I've got a set of heads that recently cracked after the engine ran hot. I figured I'd ask if anyone on here knew of anyone who specialized in repairing them. I'd usually just pitch em into the scrap iron pile but I did read a post on here one time about someone welding some cracks up. These are cracked from the center head bolt hole to the water jacket closest to the intake in the center. I can't recall for sure but it may have been Hendren racing engines that commented on cracked heads before. Also has anyone had problems with repaired heads failing quickly?

Dirt Full Roller

Total posts: 30
posted May 17, 2002 06:22 PM
If the heads are only cracked from the water jacket to the head bolt hole, you have options. One of which is just run them the way they are. The worse thing that will happen is that it will put some water into the bolt hole. If you put some RTV on the bolt it shouldn't give any problem. The better repair is get your machinist to put the head in his seat and guide machine. Then use the core drill and reamer that you use for installing 7/16 guides( such as the ex. guides on a 391 Ford) and drill about 2/3 of the way through the cracked bolt hole. Drive a 7/16 guide into the hole, then trim it flush to the head surface. The guide will keep the water from getting in the hole. You can still torque the head because you still have the original bolt hole on the top.

Hope this helps...Chuck

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