Any Hilborn Mech Fuel Injection Experts?

[sprintcar]

360 cu in SB Chevy, Brodix 11x heads, methanol. Engine is fresh, springs are new, lash is correct, fresh Vertex magneto ignition. Motor pulls under load to 5500 and then just quits - blubbers and stumbles like the plugs fouled. Slow it down and it will pull again to the same point. Motor will free rev into the 7500 range without problem.
2 7/16 injector body w/ 2 3/16" restrictors in the stacks. Main bypass has 70 pill and separate -6 return line to tank, secondary (lo spd) checked at 35psi, hispeed bypass has 68 pill, set at 75psi, these two tee into a -8 return line. Both filters are clean, all lines checked. Ignition supposedly set at 35 deg btdc.
Open to ANY suggestions!! We're going to verify the timing at the 35 degree mark but out of ideas at this point.

THANKS! Keep the wheels on the ground
Bob

 

[cycle]

Bob,Not quite an expert but,Have a friend with a Kawasaki powered Sprinter. Hilborn injected on alky,same problem you had. Turned out it was simply to rich.. Leaned it a little at a time and now runs excellent. Sounds like it"s just to fat...Good Luck..... Craig

 

[sprintcar]

Thanks Craig!
We went all over w/ the jetting - this last time did seem too rich, although everything is right were 3 different engine builders say it should be. The biggest problem is lack of test laps!! Keep the wheels on the ground
Bob
showshine@aol.com