Well I tore into it today to get to the bottom of this mystery.
Head Casting numbers.
3927185, (307,327,350) (69-76) (1.72 / 1.5) 70cc
3986339X (307,350) (71) (1.72 / 1.5) 74cc
Crank Casting number
3932442 (267,305,350)
Based on what I found I would say its safe to say its a 350.
Last edited by Blind1968; 11/19/2015 2:35 AM.
