No, I just got four 4.5l long blocks that were mechanical. All worn out. 8 valve heads. I'm gonna rebuild one or two of them. All of them are front gear trains. Injectors from 98.5 to 2001 24 valves would work for a 16 valve head. Mine are 8 valve heads, so old external injectors work. we shall see.Are the electronics in a QSB4.5 mandatory for the engine to run? Is there a way to get good performance out of one without the electronics?
No, the ones I have were mechanical, not with a VP30 pump.105 hp. The longer stroke means more torque. I will use the 8 valve head because I already have the right pistons. Injectors are cheap, and I can set the pressure to what I want with the proper shims. I have built and tested injectors many times.The engines you have are probably the QSB4.5-30 type. Looks like a 4bt 3.9 but is 4.5L, If you are going to build one there are some things you need to consider. First, those engines came with the VP30 injection pump which is electronic. You can convert it to a mechanical VE or P pump if you want. May need new injectors depending on what pop pressure those have. Second, those engines are not designed to be high performance units. I believe max HP offered was 99. They were high torque industrial engines. An issue you get into is the crank and rod angle. Those engines are the same bore as a 3.9 with a longer stroke. You'll find they have a lot of unique parts. Block has about 1/2" taller deck, crank is longer stroke, push rods are longer, and injection pump was electronic. We have a member who is currently building one of those. Might read his post. QSB4.5-30 to VE Pump Build Has Started