G10-250,,,
Higher ratio rocker arms give you increased duration,(not by much)
For a stock type set-up just stay w/stock ratio.
When I bought my Crane Gold 1.7 ratio, that is all they had at the time listed for a Chevy six cylinder.
W/the stock cylinder head, the valve guides are a little short,if you increase the ratio, it will wear out/put more side load on the valve guides.
With the guides I am using on an aftermarket cyl head,they are much longer.
MBHD
