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dave350v8 08-19-2012 01:24 PM

cylinder head drain plug
 
Hi Guys
Does anyone know the thread size of the head drain plugs,they are smaller than the gm head plugs

thanks in advance

68NovaSS 08-19-2012 02:21 PM

"Smaller than GM head plugs...", you didn't tell us what heads these are.

dave350v8 08-19-2012 02:25 PM

Hi, procomp heads(sorry couldn`t afford anything else) I would imagine the same as edelbrock heads possibly. The i.d with a vernier is .580 thou

SSedan64 08-19-2012 04:23 PM

Sounds like 1/4 NPT/NationalPipeThread 18-TPI/ThreadsPerInch.
Info >> Dimensions - Pipe Threads

Silver Surfer 08-19-2012 07:56 PM

Those holes are for the temp sensor, not coolant drain plugs. The drain plugs are on the block underneath the heads.

dave350v8 08-19-2012 11:14 PM

Quote:

Originally Posted by SSedan64 (Post 1584255)
Sounds like 1/4 NPT/NationalPipeThread 18-TPI/ThreadsPerInch.
Info >> Dimensions - Pipe Threads

Thanks for very helpful link,pipe threads are so confusing!

FmrStrtracer 08-20-2012 02:32 AM

Quote:

Originally Posted by dave350v8 (Post 1584342)
Thanks for very helpful link,pipe threads are so confusing!

Pipe sizes are measured according to the inside diameter of the pipe(so proper flow can be calculated to achieve the desired flow), so the thread size will always be larger than the pipe size.

GM used at least 2 different size holes over the years, as mentioned above yours sound like they are 1/4 NPT


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