SEIZED SPARK PLUG

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SEIZED SPARK PLUG

Post  mustang557 on February 25th 2013, 7:08 am

I PURCHASED AN ENGINE USED WITH A-460 HEADS, AND WAS DISASSEMBLING TO INSPECT PIECES AND
REPLACE BEARINGS AND RINGS. THE PURCHASE CAME WITH ANOTHER SET OF A-460 HEADS WHICH IM
INSTALLING. WHILE REMOVING THE SPARK PLUGS, I FOUND THAT QNE WAS SEIZED. I TRIED SPRAYING
THE UNDERSIDE WITH THE HEAD REMOVED BUT THE PLUG STRIPPED COMING OUT. MY QUESTION IS WHAT
ARE THE CHOICES ON FIXING THE HEAD? IS A HELI-COIL MY ONLY OPTION?

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Re: SEIZED SPARK PLUG

Post  dfree383 on February 25th 2013, 8:00 am

An insert is the cheapest solution.
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Re: SEIZED SPARK PLUG

Post  kim on February 25th 2013, 8:14 am

I would not suggest a helicoil. There are thread inserts that are a much better option, instead of a strand of wire, the hole is drilled and oversized so a steel sleave is inserted with a shoulder so it cranks down tight. Ultra ubber thread locker is also used to ensure it stays locked in place. Now you have a steel thread for the spark plug hole(s).

Don't know why most high end heads don't come with all holes done that way anyhow.

Have a machine shop do one or all, some of the inserts are called timecerts, but various manufactures supply them in assorted sizes.

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Re: SEIZED SPARK PLUG

Post  richter69 on February 25th 2013, 9:22 am

time cert, just had to do one on my sbf head.
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Re: SEIZED SPARK PLUG

Post  bbf-falcon on February 25th 2013, 9:45 am

I agree that all Alum heads need these. Smile

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Re: SEIZED SPARK PLUG

Post  maverick on February 25th 2013, 10:19 am

...And always use a dab of anti-seize compound before you screw anything into aluminum.
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Re: SEIZED SPARK PLUG

Post  mustang557 on February 26th 2013, 7:21 am

THANKS TO ALL FOR THE REPLIES, THE HEADS WILL ONLY BE USED FOR SPARES AND I DIDNT WANT TO
THINK ABOUT USING THEM FOR BOOKENDS Laughing. DO YOU THINK THE INSERT WILL HOLD UP TO THE CYL.
PREASURES OF 15 TO 1 COMP.?

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Re: SEIZED SPARK PLUG

Post  maverick on February 26th 2013, 7:27 am

Yep.
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Re: SEIZED SPARK PLUG

Post  QtrWarrior on February 26th 2013, 7:40 am

mustang557 wrote:THANKS TO ALL FOR THE REPLIES, THE HEADS WILL ONLY BE USED FOR SPARES AND I DIDNT WANT TO
THINK ABOUT USING THEM FOR BOOKENDS Laughing. DO YOU THINK THE INSERT WILL HOLD UP TO THE CYL.
PREASURES OF 15 TO 1 COMP.?

No problem.
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Re: SEIZED SPARK PLUG

Post  whatbumper on February 26th 2013, 10:31 am

used them on a procharger car making 42lbs of boost without issues

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