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#1 |
Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,335
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Why
Are the water ports in the back of a 350 blocked off?
Thanks
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RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 |
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#2 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,901
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So GM's cheap intake gaskets will fail and you have to get them replaced or replaced the runied engine.
Sarcasim aside, I wish I knew the reason other than what was just stated.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#3 |
Account Suspended
Join Date: Oct 2004
Posts: 1,276
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I believe this has something to do with manifold warm up and some 350s are diff. than say a truck 350. I don't know for sure but I remember reading something about this.
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#4 |
Registered User
Join Date: Nov 2003
Location: Alexandria, VA
Posts: 1,534
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I guess I don't quite understand your question. Are you referring to the expansion (freeze) plugs?
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction. ![]() ![]() ![]() |
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#5 |
Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,335
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Sweet72. I am talking about the ports circled in red.
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RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 |
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#6 |
Never enough time!!
Join Date: Mar 2004
Location: sw Wisconsin
Posts: 602
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My guess is that the heads will interchange from side to side, so they have a water jacket port on each end so if you put the head on the other side it will have a port in the front. That way GM only had to have one casting for the heads, instead of having lefts and rights. Just a guess, make sense?
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#7 |
Active Member
![]() Join Date: Jun 2002
Location: L.A. Lower Alabama
Posts: 453
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so the heads interchange left/right and force coolant through each head to the front then into manifold to radiator. If it crossed in the back coolant could take path of least resistance and cause one head to not cool properly.
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1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin |
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#8 |
Registered User
Join Date: Feb 2002
Location: Vacaville, CA
Posts: 2,746
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Actually you can use the back ports and not the front, that is what I will be doing on my modified LT1 intake (drilled for a distributor and water outlets).
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#9 |
Registered User
Join Date: Jan 2001
Location: Killingworth, CT. USA
Posts: 3,378
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The engine coolant cycle for a stock engine goes like this, the coolant is taken in from bottom of radiator into the pump, then pumped thru both sides of the engine block from front to rear, then pumped up into back end of the heads, thru the heads from back to front, then into front of intake and out thermostat housing back into radiator.
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1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist. |
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