Join Date: Jan 2002
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Aluminum Valve Cover Installation-258
I'm replacing the original plastic valve cover on my 1984 258 with an aluminum cover. I have a couple of questions. This is the first time I've replaced a valve cover on a 258 and I read in the Clifford catalog that the five bolts running along the passenger side and in front & back are unthreaded???? I'm not sure what this means, but the original bolts on there now certainly have threads, but I've noticed that when they're tightened, they slip like they're stripped. I guess I'll need to tap the head when I install the new cover. Is this hard to do? Is there a danger of cracking the head? I was under the impression that the only drilling & tapping that would have to be done would be to secure the two smaller bolts along the driver's side of the block since my engine doesn't have these bolt holes. Is it unusual to have to tap the five larger bolt holes when installing an aluminum cover?
Also, should RTV be applied to both sides of the valve cover gasket? On other valve covers I've done, the gasket to head seal leaked without it, is this true with the 258?
Thanks for any help.
84 CJ-7; 258 I6; Stock Condition