what plus are you using in your bbc?

[GradeA_TireFryer]

tring to figure out what plug i should run in bbc
454 .30 over
forged crank - rods
domed pistons -10.5:1 compression
heads are rectangular ports ls6 - port match - blended & bowled - huge valves intake & exhaust
oringed - copper head gaskets

edelbrock victor 2jr intake - 950 hp holey dp

hei billet distrubitor - msd digital 6
timing locked out at 36 deg

motor has about 10 miles on it, it breaks up under hard acc. - pull plugs and they are black -

jetted the carb down on primary - no change -

HELP - want to start with correct plugs - any suggestions

[Cecil]

No idea.... but the description of your motor gave me wood. :-)

[GradeA_TireFryer]

you need to hear it run - turns wood into spinters

[Suicidal Racing]

sounds like your plug is to cold.put a new plug in her and let her idel for a bit then pull it..if its loaded up on u i would go up in heat range by 2..

but the thing with this is it could be timing,carb and so on that is causing this.

[Suicidal Racing]

also go on yb.com in the n/a section there is a ton of engine builders an tuners on that site.give the cam specs 2.

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[GradeA_TireFryer]

cam specs
Lift: .588''/.593''
Duration: 294°/306°
RPM Range: 2800-7000

going to a hei 5 plug today to give it a try - heat range right in the middle