[niles]

HSSSS427;
I recently converted a 750 over to a Proform centerbody($95), it's basically the same center bode as on the HP,
these have removable airbleeds, etc. I found that useful in leaning out the idle circuit to reduce low speed fouling. they advertise 40-50hp increase. My results with a 393C stroker is that it runs some better everywhere, power is same or maybe a little better below 3K, from 4-6K, the 50 hp increase is a joke. I know I'm exaggerating but it seems like at least a 100 more hp! Before the engine was very strong is the 50-75 mph range, now it's down right scary with occasional wheel spin and I'm running a 3.08. A speed shop I use said it's the most positive item he has ever sold, NO ONE has ever been dissatisfied and all are tickled pink and that never happens in the parts arena.
gn