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Ah, this brings back memories from when I bought my car in 1977. After driving a 1965 Mustang for some years, I found that the GT500's brakes felt like they wanted to put me through the windshield when I touched the brake pedal. The difference between the two cars was truly startling. I soon learned that this was normal for the car and, once I got used to the brakes, they began to feel more normal and I didn't have a problem. So see if using a light touch doesn't fix the problem. If that doesn't do it, then it is time to start looking deeper. Best of luck solving your problem.

+1 on the Alloy Metal Products. Plain and simple, the harness fits and the connectors are correct. You will not be dissapointed.

+1

Pictures of the two heads I used for my engne build reveal the following:

Casting Date  "4V" Present
5H23 (ID 20)     Yes
5H26 (ID 19)     Yes

Cory,

That photo is a great find. But let's be clear about the writing on the back of this photo so others don't get confused as it was written back in the '70s when the accepted figure for Hertz car production was 936. I'm not sure where that figure came from. However, we now know that the actual number produced was 1,000 (1,001 depending on how the prototypes are counted. A photo of this car can be seen here: SAAC-2. Photo shows the 10-spokes and the right side horse.

Can't find my '67 owner's manual right now, but my owner's manual for my '66 GT350 shows the clearance to be 0.020 inch. Holman Moody, who makes an exact reproduction of the C3OZ-C camshaft shows the lash to be 0.018 inch. As long as you are right around those figures, I'm sure you'll be alright.

Big +1 for Bill Collins.

FWIW, I still have the origial boots on my car (6S817). Unfortunatly, I'm not in a poition to remove the seat assembly at this time, otherwise I'd closely examine the boots to see if I could locate a P/N.

A true RUG-S1 transmission would fit a '67 GT500. This is what was installed in my '67 GT500, 67400F7A03040.

+1  . Roy's description is correct and consequently there is not 12V going to the tach but only going to the Pertronix module. Using the correct wiring that Roy described there is an extra wire with 12v that runs out to Pertronix module .

Just to be clear, in this setup, the tach receives 12 VDC as it is wired in SERIES with the ignition switch and BEFORE the resistor wire. The coil receives 9 VDC (or so) as it is wired AFTER the resistor wire. The tach receives 12 VDC because it is wired between the switched ingnition wire and the resistor wire. And the PerTronix receives a full 12 VDC as the splice for that is AHEAD of the tach and the resistor wire. It is easy to get lost in this scheme as we are talking about two different voltages: 9 VDC to the coil, 12 VDC to the tach, and 12 VDC to the PerTronix unit. Splicing off of a new wire inserted in the circuit BETWEEN the switched ignition wire (which is 12 VDC) and the tach insures that the proper votages are routed to where they are supposed to go.

I hope this is all clear enough. If I can find my spare slice, I'll post a picture of what it is supposed to look like.

Kent,

I don't think that is  quite correct. Stock 1966, 1967 and 1968 tachs gets power from the 12 vdc ignition line before the resistor wire (I'm not sure about other years but I'm assuming that they are similar). That is, the tach is wired in series with the 12 vdc ignition lead and the resistor wire, which then goes directly to the coil. When I wire the PerTronix, I run a 12vdc line in parrallel with the resistor wire, only I'm taking power for that line ahead of the resistor wire so the PerTronix unit never sees the 9 vdc or so that goes to the coil. Instead it sees a full 12 vdc. I've got two cars wired this way and I have no problems with either the PerTronix units or the tachs.

There is a specific way to wire the Pertronix so it doesn't fail.

Yup, and if you do  it correctly, it is pretty easy.

+1     And it's not complicated!   

    Pertronix is susceptible to damage from voltages in excess of 16V, so ensure that it doesn't experience external charging (battery charger or jumping) voltages much over 15v and also check the voltage regulator function and the alternator's out-put under "full-fielding"   

    Cause you really shouldn't be having this problem.     

    Scott.

+1. I've used PerTronix on both of my cars for many years. Mostly because I don't like setting points, especially dual points. Not that it is difficult, just annoying. I alway take the 12vdc off the ignition circuit BEFORE the tach and resister wire by plugging in a pre-made single wire with moulded in male and female bullet connectors at either end and then splicing the red wire for the PerTronix into that. That way, there is no damage to the wiring harness and it is easily removable. The Hertz car uses the Ignitor I while I have an Ignitor III in the GT500. And I carry a spare breaker plate in the glove box just in case the thing goes sideways.

It looks like the oil pan rail stamping is
6A12B with a couple of cross engravings

Interesting, my block also had the same date for both stampings (5L3), the letter at the end is supposed to be the machinest/assembler's initial. I requested the those stampings not be removed during the machining process. And they were left untouched. The business owner is a former '66 GT350 owner...

Yes. Mary Queen of Scots is my great-great-great, great-great something or other. So to get to that level. I would have to kill off most of the family that's left😂

       Roy

Well, I'd suggest that we double up to eliminate your superfluous family members, but since my biological family's name is Mille (mother's side) and Sharp (father's side), I've got no skin in the game. So I guess you are on your own. 

King?