How to turn engine over by hand

limegreen70 said
Not to change the subject but does anyone know the size of the damper bolt on a big block?

I believe the head is 7/8".:oops: Sorry. Where the hell did I get that from?:banghead:

Summit Racing Part Number:DCC-5249562

Thread Size:3/4-16 in.
Underhead Length (in):1.250 in.
Head Style:Hex
Washer Included:Yes