Max lift/stock slugs

rumblefish360 said
One more question, on the RPM intake there is a odd threaded hole at the front of the intake with a odd 5/16 x 18 thread count. What was/is this for? Seems like a weird size to me. Nothing on the stock engine was bolted there.

If its in the water jacket it is for the Temp Sending Unit. Pretty sure I had to drill and tap it bigger for my sender.