Originally Posted by
Fast355
Welcome!!
Nice sounding rig with a lot of nice modifications. If it were mine I probably would have gone with the 170cc intake runner heads(have a set of them that I had on my 350 and the stock intake even a marine just does not flow enough air to use the 200cc ports effectively), a 9.5" 14-bolt and a 4L80E. Making it a torque monster and practically bulletproof. Before you tune that Black Box you might look into an 0411 swap. I swapped my 1997 Express to one and LOVE it compared to the Black Box. I am in the process of swapping over to the EFI Connection 24x system with 5.3/6.0L truck coils. I am running the L31 marine intake and have dreams of a 383 or 406 someday to pull my ~6,000 lbs 23' travel trailer.
Now onto the problem I see with your combination. When you start datalogging I expect you are going to see injector duty cycle well over 100% and a general shortage of available fuel. I tuned my buddies 1998 K1500 truck with a similarly spec'd 383 and it was out of fuel by 4,500 rpm and hit 125% duty cycle by the 5,500 rpm fuel kill. He had Ebay 200cc aluminum heads and a slightly smaller comp cam. 212/218 @ .050, .487/.495" lift on a 110* LSA.
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