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400 dart shp build

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Old 09-06-2017, 01:58 AM   #101
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Originally Posted by 76strokervette View Post
Please show us both if you can.
I will do that just as soon as I get my new (un-busted) phone later today.
You can go to Summit and look up EMP/Stewart #301 for the three-hole thermo. It will work but has its own set of problems like S-L-O-W warm-up and possibly not enough heat to run your engine right.

TimAT has the answer,just a little different than than what I did.
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Old 09-06-2017, 02:15 AM   #102
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Could you not plumb the bypass from the top of the water pump to the unused pipe plug on the intake to the left of the thermostat?
Yes. That's the not-so-pretty way. And for the OP he has a lot of stuff in the way of a direct path to that port. Could go to a Tee on the heater feed but that's almost as hard to get to. Either way takes a lot of contortions to get around all that fuel plumbing. It can be done. He has my sympathy.
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Old 09-06-2017, 02:40 AM   #103
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Edelbrock water bypass kit #8095 might help, relatively low profile.

http://www.edelbrock.com/automotive/...on-items.shtml
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Old 09-13-2017, 03:13 PM   #104
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Hi ALL, I've been following this thread - particularly "OldGuy's" #-96 posting.
OldGuy spoke about the fact that the Dart SHP Block does not have a coolant bypass port.
What warmup &/or cooling issues might be experienced?
I am asking because I am completing a Dart SHP 400-Block based build.
A more mild build vs. OP of this thread. 374-CID, Stewart Stage-1 Water Pump, Dewitt Radiator, L82-Fan Clutch, Standard 180* Thermostat,
218*-Intake .525"/ 228*-Exhaust .525" GM Roller Hot Cam.
A TKO 5-Speed will have this Vette running at 1700-2000 RPM on the highway.
Again the question is what warmup &/ or cooling issues because of the lack of the bypass?
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Old 09-14-2017, 09:05 AM   #105
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Originally Posted by Silver 7T8 View Post
Hi ALL, I've been following this thread - particularly "OldGuy's" #-96 posting.
OldGuy spoke about the fact that the Dart SHP Block does not have a coolant bypass port.
What warmup &/or cooling issues might be experienced?
I am asking because I am completing a Dart SHP 400-Block based build.
A more mild build vs. OP of this thread. 374-CID, Stewart Stage-1 Water Pump, Dewitt Radiator, L82-Fan Clutch, Standard 180* Thermostat,
218*-Intake .525"/ 228*-Exhaust .525" GM Roller Hot Cam.
A TKO 5-Speed will have this Vette running at 1700-2000 RPM on the highway.
Again the question is what warmup &/ or cooling issues because of the lack of the bypass?
"Again the question is what warmup &/ or cooling issues because of the lack of the bypass?"

With no by-pass the water pump builds pressure against the thermo.
Depending on how tight your pump is this probably will hydro-lock the pump and your belts will squueelll like a violated pig. At least mine did.
You could run it with the heater on which I did--until I got edumicated.

Now comes the booger in the Jello.

Without a by-pass there will be no coolant flow THRU the heads to heat the thermo to open. Until enough heat migrates up to the therm your temp gauge will/can/maybe spike up to 230-240 degs. Then the therm gets enough heat to open and you get a big rush of cold coolant-the therm closes-and you start the whole damn thing again. The system will equalize eventually but if you have a really efficient rad/cooling system it may never normalize. The 180 thermo will help. I think.

Here are a couple of pics of how I fixed the by-pass on my 412 SHP.
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Old 09-14-2017, 10:48 AM   #106
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interesting never heard of this issue with the shp....learn something new every day
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Old 09-14-2017, 11:35 AM   #107
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interesting never heard of this issue with the shp....learn something new every day
Let's see. 5 years with an SHP blocked engine in the '64, and never encountered a single problem and I have no bypass holes in the 'stat.

Maybe just dumb luck(in my case that happens a lot!)
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Old 09-14-2017, 11:39 AM   #108
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Just a thought. Is toobroke reincarnated?
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Old 09-14-2017, 12:47 PM   #109
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Just a thought. Is toobroke reincarnated?
BHAhahahahah!!!!

Haven't heard that name in a wile..
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Old 09-14-2017, 07:16 PM   #110
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BHAhahahahah!!!!

Haven't heard that name in a wile..
^^^^^^^^^^Probably a good thing Paul, we've been fortunate
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Old 09-15-2017, 02:09 AM   #111
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Why not just drill a couple of holes in the stat, you'll be less likely to get an air lock when filling too? I have a couple of small holes drilled in the stats on all my modified older cars, it will also slow the onset of overheating (giving you more time to notice/respond) if the stat fails shut. Unless you regularly drive your car for very short distances/times then I don't see much downside.
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