that 93% isnt a good thing if thats what you mean?!

My buddy had 30`s on his 347 n/a and duty cycle was 63.24 at 6000 rpm, then he went with a v1 and was at 96% at 3000 rpm, he had to use 42`s and then he was back down to the mid 60`s% cant remember exactly what though.

My 347 right now is at 65.83% at 6100 rpm anything over 80% isnt good! Eventually will burn up the injector coil and cause other issues.

Maybe you can make a good judgement call with the above posts!

Pending boost amount you need to go a heat range colder just like with nitrous upto 8lbs you should be fine with the 24`s more than that get the 23`s and so on!

 

Ok. I have the 3924's and they screw in a lot farther than the AL 25. Is there advantage or disadvantagewith that?

 

^^^^yes....the 3924 is the proper plug for a tw head, not a standard 24 plug

 

ok, cool. just got to regap them and ill be good to go. should be fired up by the end of today.

 

OMG wasnt reffering to the standard 24-25-23 etc just heat ranges figured you would follow suit and not need that to be explained any further since you established the correct plug for the head,,,, So for the mix up my bad.