Manifold replacement GT40 bolt selection

I am contemplating what is all needed to replace the manifolds on my 2000 Ski Nat. The boat was used in brackish water before I purchased it and the Allen head bolts on the manifolds and rusted away.

I see you can get a kit with all the needed gaskets and bolts:

http://www.nautiqueparts.com/pcmexhaustmanifoldservicekit.aspx

However I have seen posts on this site and others mentioning they used stainless steel Allen heads (obviously with anti seize). I was wondering this was standard practice?

I bet I have to drill out just about all the bolts, fun, fun!!

Any advice will be appreciated.


Rick

I used Grade 8 bolts from FastenAll and it worked well. Get the gaskets from NP or Skidim.

I had to drill out one Allen-head bolt and then use an Easy-Out. I went with the SS bolts and anti-seize / anti-gall Permatex.

JQ

Pete:

Sorry for the confusion. Thinking while typing can be bad...

I used Grade 8 bolts on the risers and stainless Allen head bolts on the exhaust manifolds. I originally got long riser bolts from skidim, but they were Grade 5 and I twisted one off at 25 foot pounds of torque. Yes, I was using the anti-seize, but I didn't expect the bolt to fail. I looked at the calcs for Grade 5 but didn't take the anti-seize lube into account. The Grade 8 units worked well.

I bought the Allen head exhaust manifold bolts from skidim and they were stainless.

JQ