cwb442

Just looking for some opinions on how my plugs look. They all look like this. My opinion is motor is lean, little to much timing(initial and total), but heat range ok. Opinions please. This is just 1 mile at 40 mph.

cwb442

Another pic

oldcutlass

Whats the tip look like? How long have the been in there?

cutlassefi

Go down 1 range.

cwb442

Hope that pic helps. They haven't been in there more then 10 miles. I had some fuel supply issues , long story short I could not get rid of lean condition so I pulled my elect. Fuel pump to replace and noticed very small fitting diameters on inlet and outlet so I'm back to square one with new pump and regulator. Can't send more than 1 image per reply but will show before and after of fuel fittings.

cwb442

Old left and new right

cwb442

When you say down you mean colder correct? They are ngk xr4 so go with a xr5 or what plug do yo recommend? Thanks guys!!!

oldcutlass

Heat range is fine, just barely on the lean side. You need to do a wide open throttle run, shut it down, then pull the plugs.

cwb442

Ok, thank you. When checking plugs after WOT, I'm looking for a solid ring of color/ grey/ brown down at the bottom of porcelain correct?

cwb442

Currently I'm running on 4781 Holley 80f/86r with 6.5 pv front only. 20 initial/38 total timing. Runs good but to you guys do my timing marks look to low on the ground strap or not(240 dur. Cam)? Also for cutlassefi if I made a change to a colder plug and only that will I see more color on the porcelain?

cwb442

Thank you both very much!!!

oldcutlass

Your looking for the metal ring face of the threaded section to be solid gray/brown and no specs of metal on the porcelain base.

cwb442

Ok that makes a lot of sense!!! Thank you Oldcutlass! I thought it was just the amount of threads that showed heat color compared to the rest of the threads.

z11375ss

Just run an MSD. You could put steel wool in there and it'll fire just fine!

cutlassefi

Yes one step colder. Color change on ground strap goes a little further than I'd like to see. You asked, I gave you my opinion. Others seem to disagree so go with their recommendation if you like.

olds 307 and 403

I woulď think the XR5 would be better for anything except an 8 to 1 Olds V8.

cwb442

Xr5's it is! Went up a 2 jet sizes on primary left secondary alone. Will check plug after steady cruise the do wot check after that.

cwb442

Ok, this is one heat range colder and up 4 jets front and back to 84 primary/90 secondary on Holley 4781.30 miles with full throttle pull through top gear up to 5000rpm. Looks lean to me plus hard to see heat range. What do you guys think?

olds 307 and 403

They look lean to me, definitely not rich, how does it run?

cwb442

Runs fine. No surging. Going to go up on jets.

RetroRanger

The above pic states brown or grey on the ring at the base of the threads. Based on that info jetting looks good(yours is browner your first pic looked greyer). Can't tell the heat range from the pic.

Disclaimer I'm trying to learn to read my plugs, and have bumped my primary jetting up on the qjet.

I have the ac 43s in mine and it doesn't appear to be a colder plug like an ac 42? Your xr5s cross reference to the ac 43-44. There doesn't appear to be an xr6 either.