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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Mike Phillips on July 04, 2009, 01:32:02 pm

Title: Spark plug for BBC Square Port Heads?
Post by: Mike Phillips on July 04, 2009, 01:32:02 pm

Local speed shop set me up with NGK BR6FS plugs.

I gapped them at .40 thousands for use with MSD 7AL

They're going in kind of hard?  Maybe due to some spray paint on threads on head when engine was  painted?

 ???

Title: Re: Spark plug for BBC Square Port Heads?
Post by: 82k5diesel on July 04, 2009, 01:59:20 pm

Clean the threads with a tap might help.

Title: Re: Spark plug for BBC Square Port Heads?
Post by: Mike Phillips on July 04, 2009, 02:19:30 pm

Don't want to do that, might get particles inside the cylinder head.

I put some oil on the threads of the plug and got them to start. 

Trying to figure out how to build my MSD wires now...


Ugh...

 :P

Title: Re: Spark plug for BBC Square Port Heads?
Post by: eventhorizon66 on July 04, 2009, 04:12:06 pm

If there is paint on the threads, don't you think you are going to get paint shavings in the cylinder when you finally thread the plugs in?

Title: Re: Spark plug for BBC Square Port Heads?
Post by: Mike Phillips on July 04, 2009, 05:30:56 pm

Quote from: eventhorizon66 on July 04, 2009, 04:12:06 pm

If there is paint on the threads, don't you think you are going to get paint shavings in the cylinder when you finally thread the plugs in?

Guess so...

 :o