Originally Posted by dedwards0323
Something else I discovered when I looked more carefully at the SHCS's I picked up at CDJ parts counter earlier today. The replacement screws are M5-.80x18 SHCS's!
When I tried to replace the initial screw (doing these one at a time to minimize losing the new breather cover seal), that extra 2 mm length is enough to make the screw feel like it's either 'bottoming out' or possibly out of threads when tightened (as discussed earlier in this thread). So I stayed with the carbon steel screws from Lowe's. But will continue looking for screws that would be possibly better applicable for use with the valve covers to lessen the likelihood of any chemical corrosion down the road.
I believe the screws were made with the extra 2mm in lenght to prevent metal to metal contact between the covers and squeeze all the gasket material out.
I ordered a bag of 100 stainless steel screws from McMaster Carr for $7.44.
I replaced the aluminum with the 300 series stainless and don't expect any problems from corrosion. I coated the threads will the same permatex I used on the covers.