i'm 95% sure its a 15/16ths , get a deep well 6side socket and a 3" extension and a 1/2" drive wrench and your set
it will be ALOT easier to turn over if you take your spark plugs out,
if you still have your accessories on then leave your belt on, take the plugs out and turn the motor over by pulling on the belt.
hope this helps
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NMRA O/C 9516
NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft
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