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Old 04-11-2015, 08:49 AM   #1
russcc
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Default Block drain for 8RT

Anyone drilled and tapped the later 8BA type blocks for a block drain. The 59L has one right where it should be, at front low point. The 8RT has none.
I assume you could probably drill out the 8BA at the same point for a drain.
Or will the drain hole in the water pump get most of the water out of an 8RT. ? Thank you Fordbarners.
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Old 04-11-2015, 09:15 AM   #2
42merc
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Default Re: Block drain for 8RT

I have drilled & tapped the 8BAs for drain cocks.
Really not needed as you can see, water pumps are low enough to drain OK.
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Old 04-11-2015, 03:01 PM   #3
Art Maurice
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Default Re: Block drain for 8RT

I have a 8CM in a 33 Ford would like to drain coolant without removing bottom hoses?
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Old 04-11-2015, 06:10 PM   #4
russcc
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Default Re: Block drain for 8RT

Thank you. That's what I thought about the water pump holes, but it is impossible to get the bottom hoses off in a tight '29 A roadster without removing the radiator. Good to hear drilling & tapping the block works.
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Old 04-11-2015, 06:20 PM   #5
Ross F-1
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Default Re: Block drain for 8RT

The back of the engine is usually the low point, all the crap settles back there. I've seen where people drilled and tapped back there, but the metal isn't real thick there.
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Old 04-11-2015, 06:26 PM   #6
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Default Re: Block drain for 8RT

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The 8BA flathead block WILL NOT drain completely even with the lower radiater hose removed. I always drill and tap the 8BA blocks in the same location as the drian on the early blocks. Theres a nice flat area on each side of the block thats the perfect location to add the drain plug.
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Old 04-11-2015, 11:44 PM   #7
Alaska Jim
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Default Re: Block drain for 8RT

As Ronnie stated, there is a good flat spot on both sides of the block at the front. I drilled and tapped both sides and installed drain cocks for the eng. in my 51 merc., and the eng. for my 29 roadster project. I did this so I did not have to remove hoses to drain cooling system, in case cooling system maintenance. ( heater hoses, heater control valve, t-stats, even head gaskets.) I did it mostly to be able to completely drain and change out the anti-freeze every couple of years. I will say that it is best done with the eng out of the vehicle. may not be possible in the vehicle
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Old 07-12-2020, 06:20 PM   #8
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Default Re: Block drain for 8RT

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As Ronnie stated, there is a good flat spot on both sides of the block at the front. I drilled and tapped both sides and installed drain cocks for the eng. in my 51 merc., and the eng. for my 29 roadster project. I did this so I did not have to remove hoses to drain cooling system, in case cooling system maintenance. ( heater hoses, heater control valve, t-stats, even head gaskets.) I did it mostly to be able to completely drain and change out the anti-freeze every couple of years. I will say that it is best done with the eng out of the vehicle. may not be possible in the vehicle
Why can't you drill the radiator and braise a nut for a petcock. Isn't that how radiators are tapped? Where "exactly" is the best place to drill and tap the block? I have a '50 8CM and would like to see a photo or an 8BA photo.
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Old 07-12-2020, 06:56 PM   #9
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Default Re: Block drain for 8RT

The bottom of the radiator might be good idea also, if there is spot like the '40 if I recall.
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Old 07-12-2020, 07:33 PM   #10
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Default Re: Block drain for 8RT

I have found this drain valve better than the old butterfly type. Available at boat stores or on ebay
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Old 07-12-2020, 07:59 PM   #11
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Default Re: Block drain for 8RT

Thanks, RUSSCC. Would you have a photo of that '40 spot on the block? Or would you try the radiator idea? I'm pretty new at this so you guys opinions really matter. Thanks again.
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Old 07-12-2020, 08:01 PM   #12
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Default Re: Block drain for 8RT

Thanks Paul2748. Would happen to have a photo of the spot where you installed it? I'm pretty new at this and you guys opinion really matters. Thanks again.
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Old 07-12-2020, 09:38 PM   #13
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Default Re: Block drain for 8RT

As Ronnie pointed out, a drain on the radiator is still not going to totally drain the block.
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Old 07-12-2020, 09:44 PM   #14
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Default Re: Block drain for 8RT

Quote:
Originally Posted by russcc View Post
Anyone drilled and tapped the later 8BA type blocks for a block drain. The 59L has one right where it should be, at front low point. The 8RT has none.
I assume you could probably drill out the 8BA at the same point for a drain.
Or will the drain hole in the water pump get most of the water out of an 8RT. ? Thank you Fordbarners.
It is not unusual for that drain hole to get clogged so the water will not drain properly.
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Old 07-13-2020, 07:20 AM   #15
Tim Ayers
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Default Re: Block drain for 8RT

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Originally Posted by ChuckD View Post
Thanks Paul2748. Would happen to have a photo of the spot where you installed it? I'm pretty new at this and you guys opinion really matters. Thanks again.
I'll try to get a pict, but if you look at your block, on the bottom side front behind the water pumps, there is a flat spot cast into the block. That is the spot where the 59-series blocks have tapped holes for drains.

Is kind of rounds out a bit like a semi-circle with a flat top.
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Old 07-13-2020, 09:46 AM   #16
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Default Re: Block drain for 8RT

Here is Jim's 29 roadster project block with the drain hole at the front flat spot.
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File Type: jpg 29 roadster block.jpg (43.8 KB, 112 views)
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Old 07-13-2020, 10:22 AM   #17
Tim Ayers
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Default Re: Block drain for 8RT

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Here is Jim's 29 roadster project block with the drain hole at the front flat spot.
Wow! Looks great.
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Old 07-13-2020, 12:58 PM   #18
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Default Re: Block drain for 8RT

That's one hell of a center bearing cap. Al
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Old 07-13-2020, 07:36 PM   #19
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Default Re: Block drain for 8RT

On the flathead that I had, I did not use it. I am using

it on my Y Block cars, including the radiator


Quote:
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Thanks Paul2748. Would happen to have a photo of the spot where you installed it? I'm pretty new at this and you guys opinion really matters. Thanks again.
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Old 07-21-2020, 09:58 AM   #20
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Default Re: Block drain for 8RT

Quote:
Originally Posted by flatrod View Post
Here is Jim's 29 roadster project block with the drain hole at the front flat spot.
Thanks a bunch flatrod. That's the pic I needed. I'm going to check it now.
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