540 bbc spark plugs

[mtalp]

To all that can help, I am running a 540 bbc on the street . Compression is 9:6.1 flat top ,Cam is a solid roller isky .313dur. int. [email protected] .730 lift cam is degreed in at 106.375 and valve to piston clearance is .097. Heads are brodix bb-2 plus and intake is hv 2000 , heads have been flowed and mild port work. They flow on the intake at .700 lift 377 exh.277 carb is a quick fuel950 p series mech. I am currently using autolite #3924 plug,the ground strap heat mark is in the centered from the electrode tip to the middle of the ground strap is this showing the correct range? And the #1 and#2 cylinders are showing alittle more richness than all the other plugs. What is causing theses cylinders to run diferently.

[russ67chevelle]

as for plugs, alot of people run ngk vpower plugs,good value easy to read,especially sprayed motors...call your head manufacturer they will know best ngk vpower...

the fronts are rich,well the middle 4 will be leanest, usually the rear two are fattest cause of g forces when launching...so what gives with the fronts,,, dont have a clue

[zipper06]

Same heads, 468, 10.2 comp. smaller cam .660 lift. 454R manifold, 1050 dom. NGK 8's, tried 9's but too cold.

Zip.

[cepx111]

X2
NGK V power #8 heat range.

On a side note:

I used to get these plugs from the napa warehouse here in Memphis, always in stock and only 1.99 a pop - no brainer right?

I called the other morning to get me a set.
Nope, no longer stocked them.
Said I would have to come in and pre-pay to order them and then pay $8 for shipping :shock: Thought that was pretty shitty of them.

Called O-Riely's, said they didnt stock them but could have them in by noon.
Price> 1.99
I told them, they just got a new customer.
Might wanna buy some O-riely stock guys...lol


Cp

[hammertime]

Get a champion or stay with the autolite, there was a loss in HP just putting the NGK;s in mine ..
seen more ngk's cause a miss then any plug

[russ67chevelle]

call your head manufacturer for the specific size plug, then everyone is gonna have their own favorite

i run 5671-7 on motor 8s on a small shot nitrous, and 9's for up to a 275 shot, ill never run anyother plug(mostlikely)

[Tod74]

I run brodix 2X heads and use NGK 8's

[cepx111]

Get a champion or stay with the autolite, there was a loss in HP just putting the NGK;s in mine ..
seen more ngk's cause a miss then any plug

Maybe you had the incorrect heat range? I used to run #9's years ago and had problems with a top end miss after a bit. Dropped down to #8's never missed a beat.
In fact the plugs I have in mine now I put in last spring, still popping off perfect, just wanted a fresh set.

I've heard good things about autolites too, only thing I'd put a champion in is, my lawn mower :shock:

[hammertime]

Get a champion or stay with the autolite, there was a loss in HP just putting the NGK;s in mine ..
seen more ngk's cause a miss then any plug

Maybe you had the incorrect heat range? I used to run #9's years ago and had problems with a top end miss after a bit. Dropped down to #8's never missed a beat.
In fact the plugs I have in mine now I put in last spring, still popping off perfect, just wanted a fresh set.

I've heard good things about autolites too, only thing I'd put a champion in is, my lawn mower :shock:

champions a full 5 faster then both 8 and 9's .. the only thing close to the champions were a autolite 3932 and 3910, accels were right on target with the autolites. I never used to like champions either .. my engine shop swears by them :wink:

[tcarda]

I used Autolites 3933s in my Dart 355 headed 540 with a 14.2 compression. The dyno guy liked the way they looked after 15 dyno pulls.