SS/GT 69 Mustang / Cleveland

[bnsfmachinist]

Hello all,

First time poster here, I've been searching and browsing through thread after thread and have had a lot of questions answered just by reading.

I'm considering getting my feet wet in in the Super Stock GT world and would like any advice, input anyone may have.

The car is a '69 Mustang Coupe, the engine is a '70 351C 4V.

I suppose given the date codes of the engine blocks/heads produced between '70 and '71 I could claim either year, and it appears as if rated HP for cleveland's of either year is 300hp. Sound about right?

GT seems to have broad weight limits and it looks like I may be able to run GT/F, GT/G, or GT/H based upon heaviest V8 in a mustang in 1969 and the rated horsepower of the cleveland, plus adding up to 250lbs? to shipping weight? I'm curious where this combo of car/engine might best be placed.

Carburetor, to my knowledge, Quick Fuel 780 VS is the carb to use on this engine? Cant find anything particular in writing, don't know if it depends on what I claim the engine is or not.

I am set on running the cleveland, it's a project engine that I inherited from my Father so I'm gonna go with that engine. Not sure about building for Super Stock or not...Looks like guys in GT/F thru H run anywhere from low to mid tens on a daily basis. Doesnt seem to un-reasonable when it comes to building a cleveland. Thoughts?

Thanks in advance for any and all replies!

[kwm]

70 w/stock heads must use autolite 4300D carb 300 HP GT factor
71 w/stock heads uses 780 holley carb 324 HP GT factor
head casting # are also different

[bnsfmachinist]

heads are D1AE GA's and block is a D0AE - L. Based upon what I can find, this combo could be claimed as either '70 or '71...which I suppose with different NHRA HP ratings, I wonder where I might best find myself as far as what class of GT to possibly run.

[Dave Noll]

If your engine has either of these heads ... D1AE-GA, D0AE-N ...on it you could build the 71 330 hp motor. Big mechanical cam, almost 12:1 compression, yes the 780 carb, the ALTERNATE alum manifold that everybody but the Ford guy's dislike, proven screamer.

[bnsfmachinist]

Looks like if I go for the 324 (GT FACTOR) 351C I'm in GT/E or F...thats if I'm figuring right. still not 100% sure.

[Dave Noll]

Not sure about the GT thing. The 324 HP motor has less compression & a smaller hyd. cam. All else the same. 16 rated HP difference between the 2. I like the looks of the 330/340 hp combo myself.

[Bill Harris]

With the D1AE-GA heads you can only run it as a '71 351/285 factored at 324 for GT or 351/330 (the Boss 351 engine) factored at 340 for GT. The Boss engine can only be run with a stick. The Boss engine could have some advantages if it were running in stock, although I can't recall if anyone that has done it. In S/S the advantages are less since you are not restricted in cam/valvetrain or intake manifold so the only thing you lose is a little compression, almost certainly not worth the 16 HP factor difference . You can use the 780 Holley/Quickfuel carb on either.

The code on the block is irrelevant. If it is a Cleveland block, its good to go.

If you go with the 351/285/324 these are the classes you can run (assuming by "Coupe" you are talking about a notch, not a fastback body).

Click on the pix to make it larger/readable. GT/DA to GT/FA are likely your best bet depending on how much weight you can get out of it. 3078 lbs without driver is pretty light for a '69 Mustang.

[Dave Noll]

CRAP, Super Stock. Sorry. Started new medications today so I'm a little fuzzy. Got stock on the mind. sorry.

[fred goodwin]

SS/GT 69 mustang? I heard about this and was not sure if it was true! can you run an early body with a late year motor in SS/GT? like a 305 in a 1968 Camaro?

[Bill Harris]

Most definitely. You could put an LS engine in a 68 Camaro if you wanted. Super Stock rules though, not Stock in NHRA. IHRA has a Stock GT class too but then you are limited to their events.