Does a 1972 350 Ci truck engine have 2-bolt or 4-bolt main?
A 1972 350 cubic inch (5.7 liter) truck engine almost certainly has a 2-bolt main bearing cap design. While 4-bolt mains were becoming more common in high-performance applications, the vast majority of standard-production truck engines of that year used the less expensive and simpler 2-bolt design.