421 I.D.
Hello Guy's
My understanding.
Look at the parting line between the right cyl. head and front of the block.
My understanding is that there is a portion of the block that sticks out about 1/2 inch and about as long as the head is wide, that I.D.'s the 421 I have been told, although I have never been able to I.D. one myself.
Maybe someone else can give better information on this.
Take Care,
Dusty
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