i got a 360 with a 40 over bore.....

you can order cometic head gaskets for any bore ...just be prepared to pay for them...

as Moper says...most sbm head gaskets are based on the largest bore available...'

MR Gasket 1121 are 4.14 and .028 thick...which is the same gasket as the thick composite Mopar Performance gasket.

got a set of these on my Duster since 2005....has 10.6 to 1 compression with eddy heads.