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This is a pair of Vintage Racing Heads that were done by K / G Speed Shop located in Haverford pa. THIS WAS A SPEED SHOP THAT Grumpy Jenkins used back when he was racing for most in R/D work. They have been setting on a shelf for many years after they had completely gone through, guides, springs, set up for a large roller new valves port work as well as some runner work. They are 3946074 casting that are a matched set . K / G is stamped on both heads along with other markings that they put on as well as to which side of the motor to be installed. any question please contact through . Thanks, Denny OWN A PIECE OF HISTORY