Posted by Vaughn [99.110.80.27] on Saturday, December 01, 2012 at 20:25:19 :
In Reply to: "M37 High-Compression Head"? posted by Sherman in Idaho [72.47.9.37] on Saturday, December 01, 2012 at 12:57:14 :
Looks like a normal head to me. Maybe it's the rust that gives it higher compression. As rusty as it is, spark plug threads are probably rusted out.