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12-11-2010, 06:11 AM
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#1 |
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Registered User
Join Date: Jan 2001
Location: Woodland, CA, United States
Posts: 105
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Trying to find out size of engine coolant drain plug
Iv'e been searching and for some reason can't find a site that tells me what size and type of thread the damn coolant drain plugs are on the bottom of my block. I have a 71 small block and I want to get a fitting to plumb a block heater into the engine.
If someone can help out i'd appreciate it
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3/4 ton 71 GMC 383 Stroker |
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12-11-2010, 10:00 AM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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Re: Trying to find out size of engine coolant drain plug
I assume you want to use a circulating block heater. Not a good idea to tie one in down there. Use one that fits in a freeze plug. JMHO
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12-11-2010, 10:04 AM
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#3 |
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Registered User
Join Date: Apr 2002
Location: New Carlisle, Ohio,USA
Posts: 1,404
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Re: Trying to find out size of engine coolant drain plug
It gets cold enough in California for a block heater? Haven't seen one for the drain plug. The only ones I've ever seen went into a freeze plug hole.
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   LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class!  1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started. 
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12-12-2010, 10:54 AM
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#4 |
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Registered User
 
Join Date: May 2006
Location: Wyman, Kentucky
Posts: 403
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Re: Trying to find out size of engine coolant drain plug
1/4" Pipe thread.
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1972 GMC Jimmy, 4WD, 454 CI, 350 Turbo, 4" lift, 35" tires The math teacher said my son "Bubba" could be a mathmatical genius. cause he's got 13 fingers! |
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12-12-2010, 03:20 PM
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#5 | |
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Registered User
Join Date: Sep 2004
Location: Topeka, Ks
Posts: 604
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Re: Trying to find out size of engine coolant drain plug
Quote:
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Daily-94 K2500 350 5spd extended cab longbox Project Red Velvet-68 C20 396-th400-AC-PS-PB-all original except for the 8 track and the gun rack. Build thread>>>>http://67-72chevytrucks.com/vboard/s...d.php?t=495881 My 01 TA and 88 Formula hide in the garage. :-) |
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12-13-2010, 02:56 PM
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#6 |
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Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: Trying to find out size of engine coolant drain plug
Is the heater going directly into the block or is it an external tank type? The tank type is normally connected to the heater hoses. 1/4" pipe is correct though, if that's where you need to go.
Ray
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Live more responsibly. Eat lower on the food chain. Eat vegetarians. |
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12-13-2010, 04:43 PM
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#7 |
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Registered User
Join Date: Jan 2001
Location: Woodland, CA, United States
Posts: 105
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Re: Trying to find out size of engine coolant drain plug
Yeah, its the external tank type. I was going to plumb it into the block drain then have it head up through the heater core and back into the block. Would cutting the lower heater core hose and plumbing it straight in work as well?
No it doesn't really get cold enough here in CA to need a block heater, but I am wanting to install one to decrease engine wear on cold startups, be able to defrost my windows without idling the truck for ten minutes, and I have pretty high oil pressure when starting cold so I would like to mininmize that.
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