carguy19 said:This is a huge exaggeration.
My LX with a 393 picked up 8hp on the engine dyno (not WHP) by going from a equal length JB shortie, to a KOOKs long tube 1 7/8ths. The entire gain was over 5000 rpm.
No header is going to give you 40 hp.
FoxSnake said:Well I dont race dynos, just on the track. I picked up right at 4mph at the track, (went from 121mph with Equal Lengths to 124-125mph with Long Tubes, No other hardware changes). 302ci, pumpgas, 9-10psi, hci, 3370lbs, 17'DR's. They make tremendous GAINS over short-tubes with forced induction. N/A, they STILL make WORTHWHILE gains over shorties. This is pretty old stuff, guys.
twisted89GT said:Two things:
1. BBK headers are great just do not use the supplied header gaskets. They will fail in a few weeks and you will be doing the whole job again.
2. Go with the unequal length shorties. Any minute gain is not worth it when you burn spark plug wires and take half an hour to tighten one side of bolts.
PJM99 said:another vote for FRPP shorties