BEWARE!!! NGK recommends B5HS........in my experience too hot In SoCal heat....a stock 140 4sp with 4.11's and short tires....I found B9HS worked best.... In 110 pgs...... B7HS worked best Matt Nall stocker, mod, v8, turbo, boat, Sandcar ALLVAIR! Timogen was a softy!