FelPro recommends the 1016 head gasket for aluminum heads over the standard 1218 gaskets that come in their engine gasket kits.
Pontiac heater nipples were restricted down to a 1/4" and they wouldn't have wasted money in doing that if there wasn't a reason. Edelbrock's included brass hose nipple is for the 5/8" hose and has an inside diameter of a 1/2". I always drill and tap for a plug with a 1/4" hole.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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