I've always found interesting, what the auto maker had to say
about break in. That always seems to be ignored when discussions
like this pop up, which by the way is as Jerry says, about
every other day.
The procedure that the GM factory used for millions upon
millions of automobile and truck engines was, to sell the
car to a little old lady and service it at 500 miles to remove
the light break-in oil. Refill with recommended oil then
forget about it and drive the heck out of it for 65 years.
The only instructions were to not go over 35mph for 100 miles,
45mph for the next 200 and 50mph for the next 200, after
which bring it in for service, which very few ever did
since it wasn't a covered expense.
Replacing all used parts in their original positions is old
and good advice, which any mechanic that is worth his salt
would follow. This goes for the entire valve-train.
Highly loaded valve trains, such as those that are used in
high performance engines are intended for an entirely
different animal than these mild minored stovebolt engines.
Denny Graham
Sandwich, IL
