LQ4 into a 3rd Gen/1972 Nova by frojoe

3 minute(s) of a 891 minute read

One of the other side projects has been adapting my Summit fuel rails to the new LS3 intake. I got new short LS3-style 95 lb/hr injectors to replace the previous 56 lb/hr mid-length LS2 style injectors.

Turned an aluminum insert to tightly fit in the injector cup on the intake, to measure the angle that the injectors are supposed to rest at...

The bolt hole spacing is pretty close, but not overlapping, so a little bracket is indeed feasible...

Here are the little brackets, with one side milled at 11 degrees which is the inboard angle of the injectors relative to the mid plane... AKA the "camber" of the injectors+rails, in case anyone is interested...

Slotted one of the two brackets per side just to help with assembly misalignment etc...

And there they are, installed!...

Well what I thought was an LS3 intake is actually an L76 intake.. which means a clip-on MAP sensor and not a bolt-on sensor. First issue is the bore in the intake that the sensor rests in is smaller for the clip-on sensor, so I had to drill it out to 12mm to receive the body of the bolt-on style MAP sensor...

The other annoying part is the installed height leaves a gap which allowed the whole sensor to wiggle a LOT. Best to fix that...

I made a little bolt-on bracket that wedges between the MAP sensor and its clip on the manifold, and the bracket bolts to the sensor so that it doesn't wiggle out. This sensor is now jammed on there TIGHT.. perfect...