Plaineman

Hi... I have a 2000 7.4 Merc (Gen VI MPI) and I am installing a new set of heads.

I got a set of new ARP head bolts and my questions is this... the stock bolts that I pulled out did not have washers and the new bolt kit comes with washers... This may be a silly question but do I install with the washers or just leave them out? Not sure what the difference will be but I just want to get this right.

Any insite would be greatly appreciated...

Thanks.

Brian

RHM253

Use the washers, also use the moly lube on the washer and shoulder of the bolt. Use thread sealer(liquid teflon) on the threads.

crapr6

Agree 100%..moly lube is a must to get accurate torque on the head bolts

45SS

If they are brand new ARP they usally come with a lubricant in the box. It's a moly based type lube. Contact ARP they will let you know, they are very proud of their reputation.

jeffswav

I agree, make sure you use thread sealant all the bolts are exposed to water in the engine.

mrhorsepower1

The washers have a chamfer on one side. The chamfer needs to be installed up. I DO NOT recommend the moly lube. I have done alot of testing in regards to moly verses oil. The moly actually changes the torque consistancy . Use the ARP thread sealant on the bolts to seal them. Use 30 wt engine oil on the washers.

Dean Gellner

Coolerman

Dick Maskins (Dart) doesn't like moly lube either.

crapr6

Is that so. I'll try 30wt next time, thanks for the info!
Erik

Plaineman

Thanks guys... I used Perfect Seal on the threads and used the oil on the bolt heads and the washers.

The ARP notes tell me to torque... leave it set for a few then loosen and retorque. I did this but what a pain in the ass!! Notes with the head gasket tell me I should torque again after running fot 20 hours. Guess I have some work to do this summer.

Anyway... thanks again.

B