Quote:
Originally Posted by slowbird
That is definitely a large header. Not sure if you're trying to get the 80tq that your dad is up or what you're looking to gain. But my honest opinion is it'll take a combination of intake and header work. If the plenum is so large you're having issues on the leave that's definitely not right and you will see gains once that is fixed (I'd bet your shift recovery is bad also due to it).
One thing you could do with the headers is move to a 4 or 4.5 inch collect and lengthen it. See how that works. I'm guessing yours are removable so that would be a very easy thing to test.
Fwiw, I ran 2 1/8 to 2 1/4 4" collector on my 1050hp 511ci.
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I just want all I can get & not pull the motor out every 4 or so passes. Apples to apples dads dyno #s were with his two 1050s so I was happy to get as close as I did. His motor made peak trq @ 5800 & mine @ 6700. Peak hp for him was around 7600 & for me over 8000 each piull. As far as shift points once it clears up it’s pulls strong through both shifts. 2.24 lenco 4.56 rear it leaves hard.