What plugs for the fast guys?

[turbotwister]

Hi,

What sparks plugs are the high boost ,fast iron headed cars using?

Im talking the 10.50 and faster cars(TSM etc. etc)


Thanks in advance,
Nick

 

[FastRegalWE2]

there are several choices

Autolite 103's
NGK TR6

Have to gap em tight, I started out at .028 and ended up going all the way down to .025 @ 25 PSI

 

[turbotwister]

those are the plugs of choice for aluminium heads.im inquiring about steel heads. thanks anyway:biggrin:

come on you "fast" guys!i know your out there!

 

[Nick Micale]

Try the NGK R5674-7 [stock no. 5034], these are 2 steps colder than a stock plug.

 

[Hot Air]

You might have better luck in the "Stage II" section.
Conrad

 

[Nick Micale]

You might have better luck in the "Stage II" section.
Conrad

Stage II's don't use iron heads!

 

[Chris McDade]

I've used Autolite 23's and Ac delco CR43TS and have had good luck with both.

Good Luck

 

[turbotwister]

Thanks for the replys guys.i have had experience with most plugs .Im up for some experimenting with different plugs since im in tuning mode.

Nick,

Ive never tried that plug.i think i will now though:biggrin: .


Thanks again,
Nick,

 

[Brer Rabbit]

I agree with Chris Mcdade

I've used Autolite 23's and Ac delco CR43TS and have had good luck with both.

Good Luck

Exactly.

 

[boostingbuick]

On my iron's I ran 10.98 on pump gas with r42ts ac delco plug.

 

[V6 Beast]

CR42TS. Ran them down into the 9's on iron heads. CR is a bigger electrode than the r42ts which will also work.


Sully

 

[DonnieShort]

Try the NGK R5674-7 [stock no. 5034], these are 2 steps colder than a stock plug.

Are these colder than the UR5's?