spark plug for champion aluminum heads

[workingdan]

Hey guys I just got a used set of champion heads and need to find out if the stock spark plugs are the plugs I need to run in these aluminum heads? Also are the head bolts the same? I have a set of arp on my stock heads now so I am hoping to reuse those.
Thanks for any input.

 

[KevinB]

Head bolts are different.
I always used ngk plugs in my gn1's.
R5671a-8 would be a good starting plug. You can adjust the heat range by changing the number after the dash. A -9 would be colder, a -7 would be hotter. For track only and high boost I would run a -9. For street use I would do a -8. The -9's would foul pretty quick on the street.

 

[RmvBfrFlght]

See this thread for a bunch of choices:

http://www.turbobuick.com/forums/threads/tapered-or-gasket-seat-plugs-in-gn1-heads.378347/

RemoveBeforeFlight

 

[workingdan]

Cool Thanks guys