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By charliemccraney - 18 Years Ago
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Is there anything high flow or balanced sleeve that will fit the Y? I'm coming up with nothing.
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By paul2748 - 18 Years Ago
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There is a NAPA # 6, is either 170 or 160 degree, that is high flow.
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By 46yblock - 18 Years Ago
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Stuart Enterprises has available a thermostat that is all brass and copper, of the balanced Robert Shaw style. They sell an altered version that lets water bypass while the stat is closed which is supposed to be for racing with high output water pumps. It allows more flow as I understand it. I have one in use and it apparently bypasses too much coolant, because the temp never goes above 160 unless the elect fan is off and truck is idling. If you contact them they sell an unaltered unit also. Mr. Gasket has a Robert Shaw style balanced stat, but the body is steel. Neither outfit will list a thermo for the Y specifically. Someone else may know but I think some of the Chryslers run our size. The old MELs did too, but that wouldnt be any help  . What does balanced mean? Dont know.
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By GREENBIRD56 - 18 Years Ago
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This is a Mr. Gasket big block Chrysler (383-440 etc.) "high flow" thermostat. The Y-block uses the same (large size OD) part. It is the 160° version but there are others. The main popet is 1.50 diameter as opposed to a lot of the common cheapies that are 1.0. My '56 Ford manual says the standard thermostat should open at 157° - 162° and be fully open at 180°. 
Wide open - there is an open band 7/16 high by 4-11/16 inches long - this dude will flow whatever you thought you needed - plus. "Pressure balancing" is needed when the water pump is applying considerable positive pressure from the engine side (poppet closed) - while sucking a vaccum on the radiator side. The holes allow the "local pressure" to be more equal across the poppet when it tries to open against the flow. 
The holes drilled in this one are 3/16 dia - as recommended by Stewart waterpumps to get balancing and max flow while maintaining temperature regulation. The three 3/16 holes add another maybe 5% flow when she's wide open. This set-up will make your radiator do all it was intended to - as long as your pump is putting out decent flow. If you want a higher operating temp - just drill the holes in a 180° part instead of the cold one.
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By charliemccraney - 18 Years Ago
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Thanks Stewart Components have listings for the 239, 256, and 272 included with the mopar stuff! Stewart Components Is the part number for the Mr. Gasket thermmo 4366?
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By charliemccraney - 18 Years Ago
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Thanks Stewart Components have listings for the 239, 256, and 272 included with the mopar stuff! Stewart Components Is the part number for the Mr. Gasket thermmo 4366?
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By GREENBIRD56 - 18 Years Ago
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Yes sir, the Mr.Gasket part number for the 160° is **4366** or some derivative ....... and the 180° is P/N **4367** If there is a big poppet 170° out there - and guys have said there is one commercially available - it would be another alternative. Maybe someone can post the brand and part number? These thermostats are "sourced parts" - meaning a few different suppliers make them and "brand" them for all sorts of parts houses. Stewart drills the extra "balance" holes in theirs - just the way you or I would - so why not do it yourself?
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By DANIEL TINDER - 18 Years Ago
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CASCO sells large-opening 170 degree thermostat (part # 8575C). WWW.classictbird.com
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By HoLun - 18 Years Ago
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I have a Prestone brand robert shaw type thermal stat in my 292, you can get them thru advance auto parts or www.partsamerica.com
it comes in 160, 170, 180 and 195 degrees.
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By charliemccraney - 18 Years Ago
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Holun,
Do you have the part number for the prestone?
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By HoLun - 18 Years Ago
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Part # is 370-180 for 180 degrees
cant seem to bring that up on advance's site
i tried amazon.com they got everything, P370-180 change 180 to 160 170 or 195 for different temp rating
heres a link http://www.amazon.com/Prestone-P370-180-Power-Performance-Thermostat/dp/B000C6EVLQ
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By GREENBIRD56 - 18 Years Ago
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Holun is giving you the straight skinny................ - The Prestone part is called a "POWER PERFORMANCE THERMOSTAT" and the part number has a prefix of "P370-" followed by the temperature rating 160, 170, 180, or 195. It is the "Robertshaw" style brass part and is about $7.00 plus shipping on the internet. - Two blocks from my office is a NAPA and they had the #6 Thermostat mentioned previously ($13.19). It was 170° rating (marked on the copper operating pill), has the big 1.50 high flow poppet and a little pressure relief orfice to provide "balancing". This one is silver zinc plated steel. It could be drilled for the 3 x 3/16 balancing holes if a guy really had to have them.
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By charliemccraney - 18 Years Ago
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I got impatient and ordered a Stewart Components thermostat. I didn't think the Prestone would be that cheap.
Just so we have the part numbers, I ordered #304 which is the 160* stat. #305 is 180 and #306 is 195
This thread might be quite useful in the future.
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