Lets Talk heat range of spark plugs

away wrote:I was also told that Auto-lite plugs went to china!  So you are probably right.

So what would the recommendation be for a naturally aspirated bracket car methanol injection.  TFS street head

Thanks

ngk #8 is what I run.

We also use #8 in N/A stuff and even in some small nitrous stuff

NGK Spark Plugs R5671A-8 - NGK Racing Spark Plugs

Autozone part number 4554?

Is this the part number?

away wrote:NGK Spark Plugs R5671A-8 - NGK Racing Spark Plugs

Autozone part number 4554?

Is this the part number?

Yes

So,

Here is a follow up question.  I normally run the -10 with 87 Carb Jets.  If I switch to the hotter -8 should I go up a jet
or two to accommodate the hotter plugs??????

Fuel should have been right regardless the plugs temp.  Most noticable diffrence will be start up.  Crisper

Well I finally was able to make a few passes and the car ran pretty consistent.   Here is a picture of the #5 cylinder after my first time run. These are the #8 NGK's.   I did have to idle  a bit on the way back to the pits.  Any and all comments are welcome.

Heat range looks good.  Fuel line ok, maybe a little rich.  I see a few specs, might want to drop timming a degree or two.  Few oxide of n20 fecs.

Timing is at 31 or 32 degrees. Thanks for your response.