Is using standard motor oil under the head of the bolt acceptable? Or, do I need ARP assembly lubricant?

I do have the ARP sealant for the threads.

 

I use ARP!

 

Do2g,
You need to use a sealant on all the head bolts so coolant doesn't creep up the threads and start to leak. I think some forum members had issues with the ARP sealant. Search for head bolt leaking coolant. You will find some hits on the subject.
Good luck.

 

Valco Co. makes a good thread sealer that I've used often. Can be gotten on line.

 

permatex #2 back in the day

 

If the torque spec calls for "wet" torque, I believe the place for that lube is on the threads themselves. A thread sealer would suffice, and I can't imagine that the drag of the bolt head against the head or thrust washer would influence final torque by much. I am prepared to get educated though!

 

I would think any type of lube under the head of the bolt to obtain a accurate torque reading would be adequate. I use just a dab of assembly lube and smear it around the shoulder of the bolt and the washer when applicable.If I read your question accurately.
You didn't specify where the bolt is being installed.

 

Use the ARP thread sealant for proper torque values.

Link: http://www.jegs.com/i/ARP/070/100-99...oductId=744898

 

The guy that helped rebuild my 496 builds 1700+ HP all-motor billet BBC engines for a living, he used motor oil on the head bolt threads.

 

Motor oil is fine if you use stock TQ specs. ARP sealant will do well too. Or GM or any of the other thread sealants.

Be careful using ARP lube though because it is slippier than regular oil and you will need to adjust TQ specs so you don't stretch fasteners. It's best used with their fasteners along with the specs for that lube.

JIM

 

Cylinder heads

 

.....especially use the washers and thread sealant too.....