I've used pipe plugs on olds 307's for the same reason. HOlds up fine, but don't use any kind of pipe sealer goo or silicone unless you want to hear some whistling, I used the high temp silicone stuff, still melted and made a godawful whistling on a client's car.
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1983 Oldsmobile Delta 88
1967 Chevy C-10 stripper
www.fcrperformance.com - wanna go...faster? talk to FCR.
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