domes for big bore cub

[strokersquid]

im trying to get big bore 22 or 23cc domes to fit a cool head. i see them on ebay but the sellers often say they cant tell if theyre big bore or not ( i have 68mm cubs ). is there an easy way to tell ?

[badassbanshee479]

on a set of standerd domes there is a o-ring groove machined into the edge of the dome, on the big bore dome the groove is moved out to where there is only a half groove and when you install it into the head it makes the other half of the groove.

 

here is a 18cc big bore dome. look at the oring groove on the egde of the dome.

 

 

now here is a 19cc regular dome look close at the o ring groove on this dome and you will see what I am talkin about

 

[strokersquid]

thanks for the pics !!! now i can tell

 

thanks for the pics !!! now i can tell

[badassbanshee479]

glad I could help!