[Mark O'Neal]

I've never worn out a street 331.

I've also never worn out a street 347.

The 347 will normally have more torque....but with that head you're probably looking somewhere around 330 to 350 H/P.

Personally, I'd take the 347 but everyone has their preference. I do sell 50 347 kits for every 331.

Whatever that means.......