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Old 03-27-2003, 01:59 PM
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Post replacing block heater plug

I have a chevy 350 built to around 350 hp, just got it all put in my 83 regal. I have a coolant leak in an aftermarket block heater ( i didnt put it in) on the drivers side near the back of the block. how do I remove it and how do I replace it with a freeze plug and should I be able to do this with out pulling headers or motor? I have done just about everything with engines just not block plugs. any help would be appreciated

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Old 03-27-2003, 03:01 PM
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To remove the block heater just loosen the center bolt/screw and pry it out. If it is leaking but still works you can just replace the o-ring and reinstall. Sand the core hole to ensure a good clean surface for your new plug or heater.

On many cars the block heater is behind the engine mount so removing it can be a bugger since you have to lift the engine and remove the mount. Of course you can replace the heater with a freeze plug if you like but installing it might be harder than replacing it with a heater.

DO NOT attempt to seal the new frost plug or block heater with silicone sealant, non-hardening sealer on the frost plug or a little silicone grease on your o-ringed block heater is the proper method. Don't overtighten and strip the block heater center screw, they are usually brass on the cheap ones and don't handle high torque before they strip. If you can find one a stainless block heater is the ultimate.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”

— Han Solo
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Old 03-27-2003, 05:39 PM
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thanks alot, I will try to find a stainless block heater. Im very anxious to get this ride on the road, and you gave me just the info I needed to know. thank again 4 jaw chuck you are a asset to this board!
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