I am replacing the cylinder base gasket on a '98 Zl 500.

The problem is the original base gasket is made up of 2 gaskets RIVETED together.

The motor is ALL original, never been rebuilt.

The ORIGINAL 2 style riveted gasket, part # 3005-245 has been replaced, with a SINGLE STYLE GASKET part # 3005-654.

I asked my local dealer and he said only the SINGLE STYLE is available and not 2 riveted together.

The original gasket is twice as thick as the "new gasket (3005-654)"

I have attached pictures of what the old gasket looks like.

And what the NEW gasket looks like.

I am not sure what should be used.

1 gasket or 2 gaskets stacked on top of each other like the original one was ?

The arctic cat parts diagram only shows 1 gasket, but the original had 2 that are riveted together.Do you know what would be right to use?

when i did my top end rebuild i used winderosa gaskets and they were one layer gaskets and they where individual gaskets meaning they did not join together in the middle.

i dont think there is any difference....cut the clear of each other if ya dont like it like that...just my 2 cents worth

Some say running the single gasket will raise compression, then I will need to run high octane only.

Some say to run 2 gaskets, and it will lower the compression.

Local dealer is telling me to run a single gasket, but the original motor from cat had the double gasket installed.

If your concerned about keeping it as was double up on the new gaskets and call it a day.

I would double up on them, but maybe CAT decided it was safer to run with a single gasket instead.

I am just looking to see what others have done, or why CAT decide to go back to a single gasket.

They've flip flopped back and forth on a number of their sleds................doesn't seem to bother them any.