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Discussion Starter #1
went to the track and made a couple passes on -7nkg plugs.
heat was about half way to the bend.
ran -6 plug in #1 cyl. heat to the bend or so it looked.
both at same timing 37*. when i cut open the plugs at work the -7 plug had a tan ring down at the base of the porcelin about an 1/8 inch wide. and maybe slighly tanish just at the very tip.
the -6 plug is clean all the way. like new.
this is on a sbc 406 950 quick fuel main body now, carb with 96jets.

do you raise the jet sizes when you change to a hotter plug. i should have the fuel ring at the base of the porcelin away from the electrode. correct?.
i was running 10.40-50's 123mph with the 950hp(88jets) main body and quick fuel metering blocks. changed the main body to a quick fuel 950 with the correct boosters and the car ran 10.10 on first pass 10.16 2nd (the 60' was worse.) both at 129.75mph.

piks didnt turn out very well, so couldnt post.
should i try -5plug to see if the heat will be clear on the bend.
do you add bigger jets with hotter plugs.
thanks,
 

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-7 should be fine...dont change your jets.

I tell people over and over again that you need to have the correct boosters to go with the fuel, your proof of that.

and im glad to see you get the jetting closer to where it wants to be.
 
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