Hello: A dealer service package was released in April 1962
425 hp cam
single point distributor
rocker stud pins
425 hp exhaust manifolds
the 425 hp cars were first built in May 1962
Mark VI
409ci 425hp
Hello: In April 1962 Chevrolet released a 409
Dealer Service package
425hP camshalf
425hp exhaust manifolds
single point Dist
rocker studs,pin kit
which changed a 409 hp
into a 425 hp
so how cars recieved the
425 hp engines
Mark VI