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I have those gaskets in stock and just went and pulled a set. Although they are still in the plastic, they measure 4.150, closer to 4.160 ish. Non compressed about .034, so I am sure they will compress to about .028-.030.

I cannot say for sure that they are Detroit gaskets, as I didnt even think they were still in business. I believe they are repackaged ROLS from Mexico. I will do some research to get the correct information on their origin.



So, CompetitionWedge and others, the P4120094 has an incorrect 4.060 bore description in the MP catalog??

Most all MP parts houses have that 4.060 bore in thier discriptions too.

Can someone contact Zippy about this at MP?

Getting the correct info out there could open up these parts to more potential customers. Like all the street/strip 340 and 416 stroker guys.