I realise early V8 manifolds use 5/8" and late use 3/4" for heater hose.is there really a big enough difference between them to worry about what one to use as far as flow? I plan to use a early one on my 63 289 reason is "CASO" I figure it worked back in the day,even on G.H. so why not for this engine? "ADVISE ADVISE"
Joseph R. Zeiger
Joseph R. Zeiger
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