Expansion (freeze plug) question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

usaf_gunner · 01-19-2007, 12:57 AM

Well I decided to put a block heater on my 69 3/4 ton because she has a really hard time starting in subzero temperatures. The question I have is...what size are the expansion plugs on a 350?

Thanks for the help

Josh

kevenj · 01-19-2007, 02:56 AM

Quote:

Originally Posted by usaf_gunner

Well I decided to put a block heater on my 69 3/4 ton because she has a really hard time starting in subzero temperatures. The question I have is...what size are the expansion plugs on a 350?

Thanks for the help

Josh

If I remember correctly they are 1 1/2" but it's been a while; Your local NAPA store can look up the correct block heater by application or I'll check and post it here tomorrow when I'm at work. It's also important to install it in the right location on the block. I know it's on the left side and I'm pretty sure it replaces the rear freeze plug on the left side. I'll check that as well.

**kwmech** · 01-19-2007, 10:58 AM

They are 1 5/8''

kevenj · 01-19-2007, 03:02 PM

Quote:

Originally Posted by usaf_gunner

Well I decided to put a block heater on my 69 3/4 ton because she has a really hard time starting in subzero temperatures. The question I have is...what size are the expansion plugs on a 350?

Thanks for the help

Josh

the freeze plugs are 1 5/8"

Napa part number for block heater is 605-1490. Should be installed in the left rear expansion plug hole (driver side). The element should be oriented at 12:00 (pointing straight up).

Hope this helps.

fastwillie 696969 · 01-19-2007, 07:17 PM

1 5/8

usaf_gunner · 01-19-2007, 08:40 PM

Appreciate it guys!!!

**WorkinLonghorn** · 01-19-2007, 10:09 PM

This one doesn't use no stinkin freeze-plugs:

01-19-2007, 12:57 AM	#1
usaf_gunner Registered User Join Date: Mar 2006 Location: Clinton Utah Posts: 24	Expansion (freeze plug) question Well I decided to put a block heater on my 69 3/4 ton because she has a really hard time starting in subzero temperatures. The question I have is...what size are the expansion plugs on a 350? Thanks for the help Josh

01-19-2007, 10:58 AM	#3
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,487	Re: Expansion (freeze plug) question They are 1 5/8''

01-19-2007, 07:17 PM	#5
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	Re: Expansion (freeze plug) question 1 5/8 __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex

01-19-2007, 08:40 PM	#6
usaf_gunner Registered User Join Date: Mar 2006 Location: Clinton Utah Posts: 24	Re: Expansion (freeze plug) question Appreciate it guys!!!

01-19-2007, 10:09 PM	#7
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: Expansion (freeze plug) question This one doesn't use no stinkin freeze-plugs: __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent. Last edited by WorkinLonghorn; 01-19-2007 at 10:10 PM.



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