"Recommended Parts" should be taken with a grain of salt. From a sellers perspective it serves two purposes... yes, it's an "upsell", but it's also a good reminder of parts where it MAY be a good time to consider replacement. I'd always consider replacing the thermostat when doing a water pump since it's a handy time to do so. I used to always use the Robertshaw brand but now that they're owned by FlowKooler I don't know... I haven't picked one up to compare. I think the "high flow" may be a slight exaggeration... perhaps it's 5% better? Who knows. I also recommend "blueprinting" your timing cover.... you can, and should, port-match the water passages just like you would a manifold-to-cylinder-head to improve the flow characteristics of the coolant. As far as radiators are concerned, I'm still a traditionalist using copper-brass units. Yes, aluminum is stronger for its size so you can make the tubes wider and provide the same surface area for the fins in fewer rows, and aluminum IS a bit better than copper at transferring heat from the coolant to the tube, but copper is better than aluminum at transferring the heat from the tube to the fins and air so it's a trade-off. I've never had a cooling issue that wasn't precipitated by a broken/defective component, myself. I find that when people have overheating issues they tend to have tunnel vision, focusing on the COOLING side of the problem while ignoring the heat-loading side, namely engine efficiency, as a device whose purpose is to turn heat energy into reciprocating motion. Various things can affect engine efficiency including design, mismatched components, mechanical adjustments such as valve pre-load, valve and ignition timing, etc. A high-efficiency engine produces less waste heat than an inefficient one.This is the 2nd time in the same thread you've recommended the Milodon 16230 aluminum WP. Quick Question, on the Summit description, the recommend a "High Flow" thermostat. Is that just some upsell BS or is there really a T-Stat that is "high flow"
Just wanted your two cents. If I'm going to change the Timing Cover (again it's the gasket that seems to be leaking) to the style that supports the "cast" WP (even if the WP is a cast style but is aluminum) I'd like to know these little nuisances. I'm in Florida, so cooling is a must. Already looking to invest $600 in a new RAD to replace the Champion for a cleaner stock look.
From Summit's website:
• A high-flow thermostat is recommended when using a high-volume pump.