Larger head bolts

[Johncockrell]

I used a 1/2 by 13 tap to clean the threads on one side of my 6.5 block before I found out it was metric. Do they make 1/2” head bolts? A 1/2” bolt will go through the head.

[Yukon6.2]

Hi
The head bolts used on the 6.2-6,5 are a torque to yield bolt.
To answer your question, you may find some for a different engine the right lenght in 1/2 inch but who would know if they would give the same clamping pressure as the ones designed for the 6.2/6.5.
ARP makes studs for engine headbolts which might be an option
My guess is you are going to need to replace the block to get a reliable engine that lasts. Head gasket issues are a real problem with the 6.2/6.5 and it doesn't take much to have issues.
You might get lucky and find some that work, and never have a problem.But you may go through all the work and cost of assembling the engine, just to have a failure down the road.
Were you just changing heads or gaskets? Or a complete rebuild?

[Johncockrell]

Putting on new heads after a blown gasket and a cracked head.

[Johncockrell]

I have ordered studs from ARP for both sides. Metric on one side and SAE for the other.

[Yukon6.2]

Make sure you read the thread about them that More Power posted.
I hope that works for you.
And please post your what happens, good or bad as information helps everyone

[JohnC]

If all you're doing is running an SAE tap down the metric threads, I'd be very concerned that the resulting threads would be strong enough.