[wisdommaster]

Hello to all my Stang informants

I have a 73 H code mustang. I have been reading article after article and the only difference I can see between an H code and a Q code(cobra Jet) is the carb.

My question is this if I change my carb without any other changes will that increase my horsepower? I was under the influence that I had to change my car, manifold, cam, headers and exhaust.

[tripleblack]

This used to be a common question. What's really confusing is HOW MANY different 351's Fords came with in those years.

There were 2 different Windsor motors (both of which were 2 barrel carb motors), with the difference being that one had larger valves than the other.

There were also 2 different Cleveland motors, with one a 2 barrel version (with valves larger than either Widsor motor), and the more rare 4 barrel version (with even larger valves).

Both 351's could also interchange many parts with the larger M400 motors (swapping in the rods and cranks from these motors made a 400 out of the 351).

So yes, there were differences other than just the carburetor.

How MUCh difference depends on which 351 you start with.

Since there were a LOT of the 351 4 barrel clevelands made, its even possible you have a Cleveland motor with a swap to a 2 bbl carb (which was frequently done to save gas during the gas crisis of the 70's).

I've got to go, but I'll pop back in with more data later.

[5.0 in a 66]

There were more than 2 different Clevelands. They consist of 2 basic variations, the 2bbl and the 4bbl. The 2bbl has different heads with smaller valves and ports, lower compression, 2bbl carb and intake and a smaller cam.

There was the standard 4bbl 351C, the BOSS 351, Q-Code 351CJ, R-Code 351CJ.

[wisdommaster]

Thanks for the info,

I looked at my book again and the compression is identicle. Both engins are clevelands. I don't know if this helps you but I just wanted to put it out there.

[tripleblack]

Originally Posted by 5.0 in a 66

There were more than 2 different Clevelands. They consist of 2 basic variations, the 2bbl and the 4bbl. The 2bbl has different heads with smaller valves and ports, lower compression, 2bbl carb and intake and a smaller cam.

There was the standard 4bbl 351C, the BOSS 351, Q-Code 351CJ, R-Code 351CJ.

He has a 73 model, so I focused on the actual 351 offerings for Mustangs in 73.

If he has an earlier (or later) model motor swapped in there, let's see, there are...

maybe a dozen - at least a dozen - different versions. More.