Thread stripped in rear cylinder

[geolee]

So recently I put a new cam and lifters in and when I went to put the very rear drivers side intake bolt in and torque it the bolt just started spinning so I stopped and left it. Got the cam broke in and then noticed the leak after. It's not real bad but need to fix it. Wondering what everyone else would do or if anyone had the same problem. It was a stock motor when I got it so I think it was stripped from the factory. It's a 1992 5.7 in my 84 c10 and has a edelbrock intake. Sucks cause it runs good and ready to drive it

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[Ricko1966]

The preferred repair, in my book would be pull the manifold and helicoil the stripped hole,A you might try it is get a longer bolt and see if it will bite and be real delicate tightening it.True ghetto drill the manifold and head next bigger size, next bigger size std.or mm. Whichever is very next bigger,now drill just the manifold 1 bigger. than that tap the stripped hole in the head, and use a bigger bolt.

 

[The88]

I would go helicoil route personally. But have also tapped out a time or 2 the next size up on other projects.

 

[Vbb199]

Out here in the machinists world (mine and other machiners)

When you strip threads, either plug it, redrill and tap

Go the next size up, 5/16 -> 3/8


Move to a metric (sometimes slightly larger)

Drill deeper (if you can, and tap it)

Or obviously.... Helicoil the SOB

 

[DoubleDingo]

Helicoil would be first choice.

 

[1987 GMC Jimmy]

The helicoil should be okay in a lower stress situation like that. It’s failed me in an extreme stress setting, but I was probably trying to use it outside of its design capabilities. I’ve used the solid steel inserts for busted spark plug threads on small engine aluminum heads, and I like the concept behind those better, but the helicoil has pretty universal size options rather than only a couple, which is helpful.

 

[Ricko1966]

Out here in the machinists world (mine and other machiners)

When you strip threads, either plug it, redrill and tap

Go the next size up, 5/16 -> 3/8


Move to a metric (sometimes slightly larger)

Drill deeper (if you can, and tap it)

Or obviously.... Helicoil the SOB

I have a favorite method of plug and redrill. I pick my bolt I'm going to plug it with lets say 3/8ths. I clamp a piece of whatever scrap I have on the drill press table and drill a 3/8ths hole in it.I. put my 3/8ths bolt in my freshly drilled hole Switch my bit out to 1/4 inch hold the bolt head with a box end wrench and drill a 1/4 pilot hole. Now I can use a wrench to screw in my plug.I have a centered pilot hole .Now drill and tap. Drill the head off the bolt with a 1/2 bit and there will be a nice chamfer and a perfectly centered repaired hole.

 

[80BrownK10]

That is a tiny air cleaner