I have been thinking about the new etp heads and im not sure what grind. I know that it can take 150 all day long. If i had above 450 rwhp n/a i can still use 150 or should i go less?

 

well with 450 rwhp NA and a 150 shot that would put you aound 600 rwhp total. If done right with the correct octane and timing I think its doable. It would be better if you split that hit up with dual stages at say 3000 rpm with a 75 shot and another 75 at 4800.

Or use a progressive controller like the FJO min dual stage controller. 600 rwhp on he stock bottom is getting up there. But its been done many times with succes. The margins for error at that HP level though are very slim.