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ronzara
You'll need two 1-1/5 inch core plugs for each head. These should be available at any auto parts store that sells "hard" parts, such as NAPA.
As for installation, drive the plug in with a punch or socket that's slightly smaller than the ID of the plug and a soft mallet. The edge of the plug should de driven in just slightly below the core-hole chamfer. Apply a little RTV silicone to the plug flange to ensure that it seals prior to driving it in.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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