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As mentioned...installing a 95 LT1 engine in a 37 Chevy, I have 2 sets of headers and request some guidance deciding on which set.

Shorties: I like them...but the headers hit the knock sensor...any knock sensor relocation suggestions?

-or-

Long Tube Headers...what concerns with high/low O2 sensors efficiency?

Thanks

Injuneer

Is there room to move the knock sensor to the block drain on the drivers side of the engine?

Not sure what you mean by "high/low O2 sensors efficiency". The sensors have to be hot to work. Are you planning on installing 4-wire heated sensors (used on a 95 LT1)? Should work fine with long tubes.

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Fred

The shorty header collectors fold in right at the drain plug on both sides. On my 33 Chevy with shorty's I have a TPI (SBC) engine and installed the knock sensor in the large hole above the oil filter. Had to run a die on the knock sensor to make the threads work. It works fine for the TPI engine.

As far as the high/low sensors....I am making up the wiring harness and my wiring (pin) chart refers to the high and low O2 sensors. Noticed that on the oem exhaust manifolds the O2 on the passenger side is higher than the one on the drivers side. So I assume that is where the term comes from?

Thanks
Ed

Injuneer

Knock Sensor

Not sure how reliable the plug above oil filter location will be. The sensor normally resides in water, and the oil, being denser, will affect the transmission of noise from the source to the sensor.

I don't run a knock sensor.... hard to do with the noise from a solid roller lifter cam. Engine is still in one piece, but you need to be sure you have a good, verified tune.


O2 Sensors

No. The "high" on the wiring diagram is the +voltage signal, "low" is the ground reference. Each 4-wire O2 sensor has a high and low connection for the sensing element, and the two wires for the heater circuit (12V and engine ground). Nothing to do with elevation of the sensor. Both left and right sensors have their own HO2S "high" and "low" wires.

See Shoebox's PCM diagram - clearer than the pinout list:

http://shbox.com/1/1995_pcm2.jpg

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Injuneer

Thanks for clearing that up...that wiring diagram makes sense. Really appreciate your responses.

Ed