water leak at head?

[glendale]

so iI am installing a chromed head,t5,langdon hei, and an edmunds intake on a 38 plymouth. I fired it up today for a few seconds and then started adding water. i have water shooting out of the block between the head and block near the water pump. i just realized i did not put rtv on any head bolts. could that be the problem?

 

 

specifically coming out here.

 

[Merle Coggins]

That's about where the internal bypass port would be if the block is so equipped. That would also account for the leakage you describe. It's hard to see in your pictures if it is or not. Is it the original '38 block or a later model engine block with internal bypass?

[glendale]

it is not my car it's a buddies. but I believe it's a 46-48 block.

[glendale]

some pics of the og head and gasket.

 

 

 

and this is a spare head that i had machined before i found the chrome one.

 

 

so now i see the difference. can i do anything to run the chrome head?

[Young Ed]

 you'll need to remove it and plug that hole. I think someone on here tapped it and plugged it. 

[glendale]

thank you that is what I was assuming but this car has tested me every step of the way!

[Jerry Roberts]

 you'll need to remove it and plug that hole. I think someone on here tapped it and plugged it. 

 Yes , that was over on the truck side of the forum . 

[dpollo]

The hole can be tapped 9/16  national fine  or, use the later gasket which will seal the hole against the block.

[glendale]

what year head gasket? i have to replace it any way.

[JD luxury liner]

spray the new gasket with a gasket coating

I used coppercoat. I also had to do the head removal twice. 

[Merle Coggins]

It appears that your original head gasket has the hole for the internal bypass port but the head doesn't. And your "spare" head has the port. It seems that you have a mismatch of parts there. But I'm guessing you'll be pulling the head to investigate further, and possibly plug a hole.

 

Merle

[dpollo]

51 to 59, but only if the head has the extra passage   and not the block.  You can also seal off the block passage by using the back cover from an earlier than 51 water pump.

[Don Coatney]

51 to 59, but only if the head has the extra passage   and not the block.  You can also seal off the block passage by using the back cover from an earlier than 51 water pump.

If I am wrong here please correct me. These photos are from my files and not identified well.

 

Pictured below is an external by pass backing plate with the hole blocked off.

 

 

Pictured here is a gasket for an internal by pass pump with the hole open.

 

[plymjim]

Couple of days late here but look at my post "bad head gasket" if you're still looking

for an answer. The head gasket I used to block this hole/leak came from

Auto Zone. Felpro '53 Plym. #075550.

Plymjim