M8 cyl head oil port with 4.250 bore.

[TXChop]

So in the process of trying a set of drag 4.250 cyl big bore kit on a 2017 FLHX.

I'm confused on the gasket application.
Got a Cometic head set for a 4.25 bore oil cooled. The instructions state to plug the oil port on the head. The website says not to plug the port on the head.
The gaskets i got look like the ones in the instruction sheet with the oval rib with the edge.

I know the S&S kits i have done all include the block off plug. Is it needed?


Any experience here?

[ziggy24]

supposedly, Cometic was the first company to come out with a gasket that did not require you to use a plug anymore. I have a 128 kit on my sled and no plug required.

[Sunny Jim]

 No plug required. If you do go for the plug make sure it does not
Block off the oil flow through the heads. do not bottom out the grub screw!!!

[Don D]

I pound a ball bearing in there on the bores over 4.25". The heads need to be milled anyway.

[TXChop]

Well cometic isn't answering their phone today.

Founds this. When I have apart I'll verify bht it seems they aren't needed to be plugged.

The bearing trick sounds good too. Thanks Don and everyone.

http://harleytechtalk.com/htt/index.php?topic=106133.0

[HD/Wrench]

no need to plug it that was before gasket change . I just throw them away its no longer needed IF the gasket has the complete circle and they have for over a year now