Plumbing coolant to center freeze plug

turboking15 said

The plugs are oversized by a couple thou for a press fit and i was going to use green loctite. From what i gather the thought is to get fresh coolant to the middle ports before the front of the head and block can heat it, to help with the siamese exhaust ports being a hot spot.

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I did that on a hot sbc yrs ago, I drilled and tapped the block between the cylinders, and used short turn brass fittings (90`s) that hugged the block, line running forward to the sides of the drilled and tapped water pump, it worked very well.
I never trusted the freeze plug thing .
All it took is 3/8' i.d. line and hogged out fittings , "not enough weight" to worry about or give any trouble.
You only have to tap a 1/8" pipe hole in the block , no need for bigger. I used blue push lok type hose that had a hi heat rating.
That and the rear to front lines kept the approximate 600 h.p. cool too !