Boot, Loom, Cable Tube
The No. 7 cylinder at the rear gets a 90-degree plug-wire boot, and is the only one that does. Just ahead of that, attached with a self-locking nut, is a plated silver tube which functions as a guide and heat shield for the starter cable. A wiring-harness hanger is attached at the valve-cover bolt. After Scott installs the wiring harness, he bends the hanger closed. Reproduction plug wires are from Lectric Limited and have the correct 1-Q-65 date code and other scripts. Scott has a set of original-issue plugs wires, and, according to him, these reproductions are “…right on the money.” You can’t see them, but NOS AC 44S spark plugs are installed.
Wires and Hanger
Details at the back of the driver-side cylinder head are harder to get to and often missed, but count just as much as any other details. This four-wire loom keeps plug wires away from potential damage. Its end is dipped in a rubberized coating. Next to it is a braided copper ground strap bolted to the back of the cylinder head and hanging loose for the moment. It’ll be bolted to the body once the engine is installed. Failure to connect this ground can result in baffling electrical troubles.
This bracket, which keeps the heater hose off of the hot exhaust manifold and out of the way, is finished in semi-gloss paint and bolted to the front of the passenger-side cylinder head. A hardened-steel bolt with a phosphate finish holds it to the cylinder head. It’s overkill for a light-duty bracket. “I’ve seen different types of bolts used there,” says Scott, “but I remember this car always having that bolt there.”
Power Steering Pump (Front and Rear Views)
Semi-gloss black is the only color you’ll need for the power-steering pump, pulley, and brackets. The large bracket behind the pump is bare aluminum. “Bolts are zinc- or phosphate-plated,” says Scott, “and they are authentic in all the positions.”
Water-Pump Pulley and Bolts
Pontiac used a zinc dichromate-plated water-pump pulley. This one is NOS, so it has a factory-correct look. Scott tells us that some restorers have reported power-steering–equipped GTOs with silver zinc-plated pulleys, but he thinks they were west-coast cars. “Judges don’t seem to care one way or the other at the GTO Nationals, but I’m sure that the double-groove upper pulley was never black. We’ve seen some single-groove pulleys without power steering black or silver.” “Until ’67 or early ’68, Pontiac used this style of water pump. On the bottom bolts, particularly the one that’s near the water inlet (lower arrow), the threaded hole breaks into the coolant passage, so Pontiac used a stud with sealer in that position. There are two more fasteners on the bottom of the water pump that break into the engine crankcase, so they get a stud with sealer, too. The nuts are self-locking, so when you take a water pump off, often the studs tend to come out, too, and people don’t put them back in. This engine has the proper combination of studs and place bolts.”
On non-air conditioned cars, the harmonic balancer and all of its fasteners are painted Light Blue, along with the rest of the engine. Air- conditioned cars got a bare pulley. “If the car gets air conditioning, they took the balancer bolt and the entire assembly off and traded it for a hub, pulley, and weights that had no paint whatsoever. But all other cars, whether power steering or non-power steering, get this double-groove balancer that was on the engine when it was painted,” advises Scott.
The balancer timing marks get masked prior to painting. There are two marks on the balancer—the first is for 6 degrees BTDC, the second mark is for TDC. “I presume they took a piece of tape and laid it over those marks so that they didn’t fill in with paint. We’ve seen this on original cars and on some of the pictures we’ve acquired over the years,” Scott says.
Replicating Pontiac’s Engine-Color Paint
“We’ve had a lot of original, low-mileage Pontiacs over the years, and we’d find places on their engines where paint hadn’t seen oil or sunlight. Upon our request, a paint store mixed this Light Blue color based on those parts. It’s acrylic enamel with a little bit of hardener sprayed from a spray gun. It gets a nice surface to it ,where if things spill on it, it wipes up easily and doesn’t stain. In addition to this color, I have’66-’70 Light Blue Metallic and March 15, 1973, through ’74 Dark Blue, which is correct for all ’73-’74 Super Dutys. If people call me, I can sell them quarts of any of these paints.”—Scott Tiemann
My goal is absolute authenticity. Every nut, bolt, and clip, as far as I’m aware, is absolutely on the money.
Pontiac valve covers use four bolts, and are interchangeable. Even so, there is a right way and a wrong way to put them on. On early valve covers, the edges are different—one side is straight, the other is not. The side without the straight line should be installed closest to the carburetors, leaving the most visible edge just above the exhaust manifolds with the straight line.
Trouble occurs when people try to swap ends to put the pentroof to the front on both sides. The pentroof should only be forward on one side, and to the rear on the other side.
We’ve got a lot more to come next month. Don’t miss the next issue of High Performance Pontiac and Part 2 of “Detailing Tiemann’s Tri-Power 389."