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Old 02-12-2018, 04:02 PM   #6
gizmoduck81
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Join Date: May 2016
Location: Seattle, WA
Posts: 42
Re: 454 in a 63' GMC SWB

I have a mark IV 454 with a TH400 in my low hump 63 (it's out right now being built as a 496). It was a prior owner install. The one thing I don't like is there isn't much space between the water pump and radiator so he had the electric fan mounted as a pusher instead of a puller. No overheating problems as a 454, but I'm upgrading the radiator for the 496 (plus aluminum heads) and am hoping it'll sit 0.5" - 1" or so further back with my new mounts to allow space for a puller. The TH400 fits just fine with the low hump.
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