Originally Posted by
Kaweh
Jay, i use 91 octane at the moment. I ordered a BAMS chip from Harris Performance. I just received it today and haven't put it in yet. I had the injectors tested and they were too low for this motor according to many sources. now I have 90 lb/hr injector in there and a EP381 AC delco fuel pump which is overkill but Harris recommended the upgrade as well. The backfire happened because of a ground short from the injectors. i bout this rv used and someone had messed with the injectors. and no matter what, it had great power and up the hill to burnin man six years in a row yielded no problems. anyway, the backfire is gone. engine runs great just up the hill the manifolds start to glow in a matter of seconds and it's scary. I am going to make a video of this before i put in the prom just to show the level of the severity.