ring break in time

Further to my comments in post #7.

These come Race Engine Technology magazine, a British Bi-monthly magazine. If you want to know to adjust your carb, buy Hot Rod magazine. If you want to know how the race winning Indy Chev Ilmor engine was designed, buy RET magazine.

There is a 13 page article on Nascar engines & upcoming changes.

One comment about engine performance caught my eye: 'Our engines actually run better on the second hit [ second of two 500 mile races ]....our engines go & race 500 miles & come back & actually run better than they did before they left.'