I feel like TF did a really good job with the BB 240 and 270 heads and I was pleased with my 240s I got. My dad got a set of TF 190s and he picked up roughly .15 in the 1/8 mile compared to Edelbrock's on the same engine. Both were OTTB, but maybe it was just me, but I was hoping/expecting a little more picked up than that.