ATHENA-SCE HEAD GASKET - 4 BOLT LS - W/ VULCAN CUT-RING - 4.150" - 0.059" - CR201559
This Is the ultimate seal for your LS engine! Available in 3.997", 4.056", 4.150", and 4.174" bore sizes. These gaskets use a stainless o-ring that cuts into the head to provide the strongest seal available for high boost or high compression engines.
Because the o-ring cuts into the aluminum head, when you pull the head off you will have to surface .0003"- .0005" before reinstalling the head.