Thermoquad or Holley?

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The rear end is a 1973 8 1/4 I don't know the ratio, its a sure grip but seems like awfully high gears, the whole drivetrain is from a 73 duster 340.


before messing with carbs and all i think you need to do a little more research and find out exactly what you have all the way around..
 
before messing with carbs and all i think you need to do a little more research and find out exactly what you have all the way around..
Yep, I wish I could find the guy who actually built the car, I'd sure have a lot of questions for him.
 
FYI that 9103 carb is off of a 77 400 HP, That being said I would go with the Holley.
If it is a car carb, yea, possibly no good.
If it is a truck carb, it’s OK. No real big emissions to contend with.
Maybe somebody else has and will chime in with the magic secret.
It is possible to use a AFB AVS step up spring. It ain’t pretty. You can also delete the spring all together and let the TQ’s residential base plate cam lift the tree for enrichment. Not a great thing, but it works. The TQ is do-able but IMO it only goes so far. Which can be pretty good.
 
That port is easy enough to add, and you can even customize the cut-in point.
Ok I didnt know that. Thanks! I'm just starting to learn about them. I'm wanting to run a tq on my 360 for a nostalgic and classic look and feel.
 
Actually, that's not quite correct. That port was never used for the distributor from the factory. It was used for the EGR valve. But you ARE correct in that it DOES make the perfect port for the distributor vacuum advance.
I didnt know that either.
So from the factory where was the distributor advance plugged?
 
I didnt know that either.
So from the factory where was the distributor advance plugged?
This one has a vacuum advance port. PCV port is in the front.

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Without the rear gears we really don't have a full grip on what's going on here let alone the cam. Maybe the chock the wheels and turn the Driveline test? Easy to figure out the gears...

also my vote is for dual quads and run the thermoquad and the Holly and really blow everybody's mind LOL:poke:
I'd like to listen in on the call that goes to the holley or the Edelbrock tech line when you tell him about this combination LOL:D
 
I can't believe the prices of the 4150's now days, I may need to start saving and spring for a new one.
 
It could be freeway gears and along duration cam bad combination. I think maybe Jack the car up in the back and Counting the rotations of the tire versus the Driveline.
 
It could be freeway gears and along duration cam bad combination. I think maybe Jack the car up in the back and Counting the rotations of the tire versus the Driveline.
Yep, I've been aiming to do that, I've even thought about pulling the cover just to see also. I wish it had 3:55's but i believe its in the neighborhood of 2:76.
 
If it is a car carb, yea, possibly no good.
If it is a truck carb, it’s OK. No real big emissions to contend with.

It is possible to use a AFB AVS step up spring. It ain’t pretty. You can also delete the spring all together and let the TQ’s residential base plate cam lift the tree for enrichment. Not a great thing, but it works. The TQ is do-able but IMO it only goes so far. Which can be pretty good.

I've tried the sprAng delete. It didn't work well for me at the time.
 
I'd really like to have a new RPM airgap and a new 4150 holley, I had that setup on a 73 dart sport 360 I had a couple years ago and loved it. I guess now that money's short I'm just looking for cheaper ways.:)
 
I'd really like to have a new RPM airgap and a new 4150 holley, I had that setup on a 73 dart sport 360 I had a couple years ago and loved it. I guess now that money's short I'm just looking for cheaper ways.:)

Well I can sure relate to "all that".
 
Yep, I've been aiming to do that, I've even thought about pulling the cover just to see also. I wish it had 3:55's but i believe its in the neighborhood of 2:76.
276's and a long-duration cam.. this could be a possible problem...
 
Yep, I sure need a better distributor, I'm working with some ancient stuff on this one.
 
ok, if you say it's not, then it's not.

I have had 8 of these dist and the cars always went faster with them when set up correctly, SB or BB I have them in many motors and they work better than any dist I have used. They have a big ball bearing in the top of the shaft above the tach drive and it is super tight no play ever, they used good bearings back then. Sometimes old technology is better and this is one good distributor.
 
I have had 8 of these dist and the cars always went faster with them when set up correctly, SB or BB I have them in many motors and they work better than any dist I have used. They have a big ball bearing in the top of the shaft above the tach drive and it is super tight no play ever, they used good bearings back then. Sometimes old technology is better and this is one good distributor.

I understand. I know what they are. They are more of a race bred unit, which he does not need. I agree about the old tech more than anybody. You should know that. Nevertheless, "whatever" tech you're using should be matched to "what you're doin".
 
I agree to a point. But he has it and I don't think it is a problem. He has other problems.
 
I agree to a point. But he has it and I don't think it is a problem. He has other problems.

I agree. I didn't say it was "the" problem. Just one. I believe he may not have enough initial timing mainly. The type of distributor doesn't matter there, but it can make a difference elsewhere. I think we're on the same page with this.
 
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