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MR-1 Pontiac Block Oil Pan Rail

There are NO pan rail issues with our MR-1 and MR-1A Pontiac blocks. What this means to you is that your stock oil pan will not only fit, but it will also clear the cross member of your car when you put your new MR-1 engine in it. The MR-1 and MR-1A Pontiac block’s pan rail is made to Pontiac tolerances.
MR-1Pontiac block pan rail main cap