Dropped of the HO at the machine shop today….here’s some sweet 455-HO engine pics! Enjoy…
I have sale prices for the month of February on 455-HO.com T-shirts AND wiring harnesses! $270 for a new rebuilt unitized wiring harness or $200 to rebuild the one you send to me. Add $10 for return ship.
T-shirt are now $20 shipped to lower 48 for the rest of February. Normally they are $25 plus ship. Here’s what’s left of my T-shirt inventory:
1 – kids large
1- ladies cut large and 1 medium
5 – 2X
4 – L
These are 100% polyester, similar to the moisture wick shirt. Get them while supplies last! Send me an email for order and payment instructions at
I am out of banners, if I get a commitment of 5, I will make some more. Here’s some pics:
Some of you may already know this, but I can rebuild your unitized wiring harness for your vehicle with a unitized distributor! I have rebuilt over 10 sets now for my fellow enthusiasts, and if you’ve been hanging on to your old wiring harnesses like I have over the years, I can rebuild yours too.
Shown above is a rebuilt set with wires dated 3Q71. They are built with new wires I purchased from Lectric limited. I have a limited number of harnesses available for rebuild on hand for outright purchase. I will rebuild a harness with your car’s correct build date. You may have seen my ad on eBay. I sell them for $295. Just email me @ patbrown@455-HO.com. If you have a set to rebuild, send it to me and I will rebuild it. Price is $225 for that service plus ship.
I have a special 455-HO.com price for anyone interested in purchasing through my web site: $25 off during the month of February for rebuild service or outright purchase! Just mention you saw this on my web site. So $270 for outright purchase or $200 to rebuild your harness! All prices include new wires.
Thanks to Fred Simmonds research and Pontiac enthusiast Diego Rosenberg for helping get these completed numbers out and available, we now have the complete breakdown of 1972 455-HO Lemans numbers. I will update my stats page, but we now know the transmission breakdown of the 46 HO Lemans that were previously unknown. Of the 46 HO Lemans hard tops (23537), 21 were M22′s (manual) and 25 were M40′s (auto).
I’m using a new wordpress app, so maybe I will have more posting going on here at 455-HO.com! I’ve been readying my HO this winter for the upcoming show season.
Let see how this new app works…..posting now!
We now have available for purchase, 455-HO.com T-shirts and Banners! Banners are 2′ X 4′. Great for your 455-HO hang out! Banners are $50 plus shipping. T-shirts are $25 plus shipping. I have sizes from Large to 2X in stock. I also have a few Ladies cut Larges in stock.
Don’t forget, I have THE BEST 455-HO air cleaner sticker on the market! Concourse quality. Click on the menu heading: Correct 455-HO stickers for more details! Stickers are $20 each, Plus $5.25 USPS priority mail shipping.
Until I get my store up and running, you can email your order to me @: patbrown@455-HO.com . I accept Paypal, personal check or USPS money order. THANKS for your support of 455-HO.com!!!
In part 2, I failed to show the lead off the main engine harness that connects to the unitized distributor. The unitized ignition has been the precursor of sorts for other ignition systems like HEI. This system is unique, and hard to find still in operable condition.
The 12 volt pink wire that attaches to the front of the distributor comes out at the junction where the corrugated tubing starts near the second fire wall clip.
The pink wire comes out at this location and connects to the distributor.
How does this system work? Well, I will provide a link written by Rocky Rotella for High Performance Magazine. It was published in the April 2009 issue. He did a wonderful job on that article.
Comming soon…vacuum routing and how to remove a 70-72 dash.
I’ve talked a bit on the unique wiring harness clips in part 1, so I’ll go into more detail with pics on the routing of the engine wiring harness throughout the engine. Starting from the fuse box plug in, the wiring comes up and over the brake booster where the first firewall attachment hook is located.
That connection gets us over the brake booster and to our second firewall connection. This one sits just below the wiper motor and the first split off of wires that connect to the wiper motor.
The brown tac wire is also run through this connection. There is a single black wire in the above pic. Disregard that wire. It is not supposed to be there. That is the wire that comes from the intake TCS switch and goes down to the transmission. For some reason, that was cut and run separate at some point in the last 40 years. This wire should be with the two wires that stem off the wiring harness near the distributor and drops down to the transmission (See the pic below).
From the second firewall connection, the harness splits. One side goes behind the distributor to a third firewall connection, and the bulk of the wires go along the topside of the drivers side valve cover, along the edge of the intake. At the front of the valve cover, there is another connection for the harness that attaches to the valve cover bolt (see part 1).
There are a lot of wires that come out of the harness at this point. There are two wires that go to individual connections. As covered in part one, the green wire comes out and around the front of the valve cover and to the secondary temp switch on the cylinder head. The yellow wire with black stripe comes out and goes to the carb solenoid. These solenoids are often times missing and the yellow wire is just dangling somewhere at the end.
One bulk of wires goes down in front of the block and down to the starter. These wires are run close to the fuel line from the carb to the fuel pump.
The second bulk of wires goto the alternator. See above pics. Now, back to where the wires first split after the second firewall connection. There is a short section of corrogated tubing that goes to the third firewall connection. At the end of the corrogated tubing, there is a split, where the two wires come out from the harness and lead to the transmission. The rest of the harness goes to the passenger side, and the wiring gets run through that third firewall connection.
From the third firewall connection behind the distributor, the harness curves around the distributor and goes to the passenger side valve cover and makes connection there at the rear valve cover bolt connector.
Alright, now onto the passenger side of the engine harness. Whether or not your car has AC, you will have this next connection at the rear of the valve cover. If you do, it will look like the one pictured below and have a brown wire that goes out to the front of the engine and makes the rest of the connections to the AC accessories. This location is where the AC harnes plugs into. Again, if you do not have AC, then you will have an open plug sitting on the valve cover connection.
You can see in the above pic, this is where that black wire comes from that should be disregarded in previous pics. This black wire is supposed to be run in the wiring harness that goes back to the third firewall connection, then comes out as one of the two wires that lead to the transmission. This is part of the TCS system. I won’t go into specifics of that system here, but I will show you how it gets hooked up. These systems are almost always disabled, or missing. Now, coming from the third firewall connection, there are three splits off the main harness. One, as I stated above, goes to the valve cover for the AC connection, the second is a blue wire that drops down to the oil sender connection that sits on the oil filter housing. The third split off goes to that TCS switch that sits on the intake. The connection has a resistor built in the plug.
The rest of the engine harness goes to the water temperature switch on the passenger side. The harness goes through the lower valve cover clip and connects to the water temp switch.
The engine harness ends at the water temp switch. Now, if your car has AC, the AC engine harness section will be added at that connection on the topside of the passenger valve cover and extend out to the AC accessories.
The brown wire runs along the topside of the valve cover and connects to the thermal switch. The switch is mounted on the underside of the forward AC intake bracket. From that switch, the green wire comes out and goes into a wire clip on the bracket. These are often missing and it sits to the right of the switch as you look at it from the front of the car. This wire goes to the compressor. There is a ground that comes off this connection that goes to the top mounting bolt of the compressor:
The black wire from the thermal switch goes to the back side of the compressor.
The Thermal switch looks like this:
There you have it, installation and routing of an original 455-HO engine wiring harness! Next up, correct engine vacuum routing.