The Edge piece looks exactly what Edelbrock includes with their heads. Think it would be a good idea as Grandville said to reduce diameter to a 1/4" somewhere along the way as Pontiac did with their stock heater nipples. Reduced flow in and full flow out of the heater core should help reduce internal pressure spikes.
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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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