Originally Posted by
Power of 8
I have a 1991 F250 4x4 EFI 351w V8 with hooker shorty headers, true dual exhaust with 3 inch stainless steel piping with flowmaster super 44s.
Dual 3" all the way back? That's too much exhaust for a 460 so you're losing quite a bit of low end torque.
Originally Posted by
Power of 8
I've been looking at hydro rollers
Rockers or camshafts? If it's rockers you're talking about that rating doesn't apply.
That truck has the SD EFI system on it which means if you you're changing the cam it has to be compatible with that system or "computer controlled", in general that means no less than 114 degrees LSA and no more than 210 deg duration at 0.050" lift. However you will find some cams that meet those specs(or are very close) that aren't rated computer controlled so there are a few more options available. Your motor currently has a flat tappet cam in it as well and converting to a roller involves using linkbar roller lifters and shorter pushrods which drives up the price quite a bit, but considering how many flat tappet cam failures we're beginning to see it's probably worth the expense.