I wonder what pistons, crank, and rods they use.
Cast crank, forged rods and 10.5:1 compression is all I can find.I wonder what pistons, crank, and rods they use.
Howell will use whichever O2 you specify, and if you didn’t specify one then it would default to an AC Delco AFS93 O2 sensor which is the connector you have. Get a pair of AFS93s![]()
My Howell harness had the same problem. Howell sent me 2 female/female connector/adapters no charge.The harness and the O2’s have the same male 4 pin plug.
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My Howell harness had the same problem. Howell sent me 2 female/female connector/adapters no charge.
You beat me to it.Just so you end up with the right stuff - the connectors you have are female. Connectors are gendered by the terminals, not the bodies.
Exactly what was said above...
I'm not sure how this would have happened but they can make to jumpers for you...usually at no charge. They that for a different gender issue I had with something years ago.
Apparently on yours anyway……I just double checked my spreadsheets and the three 8.1s and 2 Vortec 454s that I’ve done all used a Denso 234-4019 (AFS93). Odd that I’ve gotten 5 harnesses spread over 15 years with the same O2 plug for a AFS93For future reference, I spoke with Troy @ Howell and he said the harness is designed to work with GM GENUINE AFS75 oxygen sensors.

Apparently on yours anyway……I just double checked my spreadsheets and the three 8.1s and 2 Vortec 454s that I’ve done all used a Denso 234-4019 (AFS93). Odd that I’ve gotten 5 harnesses spread over 15 years with the same O2 plug for a AFS93![]()
No doubt! And you still go the wrong answer here. Sorry dude. Odd harness came that wayYou got lucky.........
It's a little frustrating because I asked them for the p/n for the correct O2 sensors and didn't get a response so I asked here.
No doubt! And you still go the wrong answer here. Sorry dude. Odd harness came that way

If it makes you feel any better, they used the wrong alternator plug and goofed up the EVAP leads on my latest harness for the L29 454 K5 I’m building now. I clearly told Troy that I was using a CS144 140-amp alternator, and they still used the oval plug that’s used on the base alternators. Then I told them I needed the EVAP Vent Valve circuit to be about 9 feet long as I had planned to mount the EVAP can somewhere towards the back of the rig. It showed up with a 9 feel long Purge Solenoid lead, which is on the intake, and nothing to go to the Vent Valve.. They were quick to sent me what I needed with the instructions where to pin the Vent Valve circuits in the ECM but geesh. It’s like, don’t you guys write this shit down?No need to apologize, it's just Howell being inconsistent with their product. I've found a ton of useful information in this thread![]()
. I guess, I somewhat understand that these harnesses are kind of involved to build with large margins of error. I mean, that’s why I don’t build my own harnesses
and at the end of the day, Howell is probably still the best in the business.
If it makes you feel any better, they used the wrong alternator plug and goofed up the EVAP leads on my latest harness for the L29 454 K5 I’m building now. I clearly told Troy that I was using a CS144 140-amp alternator, and they still used the oval plug that’s used on the base alternators. Then I told them I needed the EVAP Vent Valve circuit to be about 9 feet long as I had planned to mount the EVAP can somewhere towards the back of the rig. It showed up with a 9 feel long Purge Solenoid lead, which is on the intake, and nothing to go to the Vent Valve.. They were quick to sent me what I needed with the instructions where to pin the Vent Valve circuits in the ECM but geesh. It’s like, don’t you guys write this shit down?. I guess, I somewhat understand that these harnesses are kind of involved to build with large margins of error. I mean, that’s why I don’t build my own harnesses
and at the end of the day, Howell is probably still the best in the business.
One thing I did differently on this latest order was to order it bare and without looming, as it seems there are always circuits that are in the wrong spot, too short, too long, etc. They gladly did that and sent the looming and tape separately. I’m glad I did this because the MAF and IAT were on the wrong side.
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