Originally Posted by Raylar Engineering

We ran all of our manifolds on Sunday and learned a few things. The cool gap manifold, with it's longer runners made slightly more torque than the shorter runner new prototype manifold. However, the shorter runner manifold really takes off past 4500rpm, and it makes more power than the cool gap by 5400-5500 rpm.

The modified stock manifold produces great torque and midrange, but even with all the modifications we make to it starts to fall off around 5200 rpm.

The motor we used was a marine engine so it's rev limiter was (non-adjustable) set at 5400-5500 rpm, so we don't have a really good idea yet of where the short runner prototype manifold falls off, but we're guessing around 6200-6400 rpm based on what we saw. We'll be running more tests with the 540 engine soon to see what's possible with a street motor.

Originally Posted by 1BadAction

I think this about solidifies my plan to swap to a 540ci 8.1. My modded TBI runs stronger than a new stock 8.1 Burb but at that, the TBI is tapped out. Also, this OBD1 computer bullshit is for the birds, it might be cheap but that's about the only advantage I see.

Originally Posted by xx_ED_xx

I just did a 496 swap on a 1993 3500. And it runs mucho better then before. If you need help with swap info send me an email. Edward.coss@Gmail.com

Originally Posted by 1BadAction

I think this about solidifies my plan to swap to a 540ci 8.1. My modded TBI runs stronger than a new stock 8.1 Burb but at that, the TBI is tapped out. Also, this OBD1 computer bullshit is for the birds, it might be cheap but that's about the only advantage I see.