US style 200, what is the highest HP anyone has created?

[FALCONAROUND]

I want to make BIG power with my 1970 200.

What's the highest HP I am likely to be able to make while keeping the original head?

I am going to modify the head for sure, but I am not going to put on a bigger head or an aftermarket head. It's going to be 99% 1970 Maverick 200, with diffrent carbs adn maybe slightly larger valves and lots of port work with hedders.

Anyone got #'s with theirs? Or did everyone and their brother who wanted power go with bolt on app's. like aussie heads or 250 heads and the like?

FE

 

[XFlow_Fairlane]

if you want to keep your motor your best bet is to go turbo. not going to make alot of power on a stock head (even ported) when compared to a turbo or 2v

 

[falcon fanatic]

Assuming you don't want to go turbo and that money is no object, you could try extrude honing and then build a cammy, high compression engine. You'll certainly have to modify the intake manifold, though. A progressive triple carb setup would probably be the most "classic" setup, but the direct mount 2v will be easier, comprable in power and could be made to look stock. It seems 200hp is the magic number with an original head, and I'm not entirely sure anybody here has done it yet (without nitrous).

However, if you go turbo you'll spend half the money and make twice the power. In fact, you could probably build a nice turbo system right onto your stock engine (changing the carb) and make close to 200hp. Then you can drive it until it explodes, which might be a long time, all the while carefully building a new 300hp motor that will take full advantage of your existing turbo. Old engine explodes, swap new engine in in a weekend, keep on layin' rubber.

As for swapping the aluminum head, I will say the following. I am currently having a head built at a local machine shop. Once you factor in the purchase price of the head, the big vavles, new springs, etc., and the extensive machine work I am having done, the final price is darn close to what the new aluminum head will cost. and I doubt it will make near the same power.

Another consideration. Isn't a 250 an easy swap for a Maverick? Why not locate a nice 250 and build that up carefully with a nice cam and a well prepped head? Those extra 50 inches have to be worth some serious torque.

 

[FALCONAROUND]

OK , let's pretend I asked that same question again only this time I will specify that I am useing 2 two barrel carbs, and I will NEVER use NOS or a Turbo ever...

I'm a naturally aspirated guy...

 

[LaGrasta]

with the stock head… 205hp is my guess.

 

[Bort62]

I say 197.5

 

[FALCONAROUND]

Thnaks! You guy's are great! NOw I'm going to get 225 out of it if even I have to wash my hands once in a while...


FE

 

[Junk-Falcon]

i have done

 

[drag-200stang]

195 hp

 

[250mav]

Another consideration. Isn't a 250 an easy swap for a Maverick? Why not locate a nice 250 and build that up carefully with a nice cam and a well prepped head? Those extra 50 inches have to be worth some serious torque.

the 250 uses a v8 transmission bellhousing thats diffrent than the 200 so that would have to be changed. other than that its would be straight foward swap and theres no reason it couldnt look original. lots of mavs have 250's stock anyway, both mine do and from what ive heard deliver a noticable amount of more low end power over a 200 in stock condition. i think its definatly something to look into.

does the 250 have the same head as the 200? i would imagine a 250 head would flow more but im probably wrong???

 

[Anonymous]

I'm getting between 175-180 out of mine right now and it has had every trick in the book done too it.

Later,

Doug

 

[grocery getter]

OK , let's pretend I asked that same question again only this time I will specify that I am useing 2 two barrel carbs, and I will NEVER use NOS or a Turbo ever...

I'm a naturally aspirated guy...

Why discount the turbo? even with porting and headers 2-two barrel carbs are going to be over kill.

cut the log and go port injection 8)

 

[250mav]

more cfm's can hurt you just as much as it can help. a single 2bbl in the 300-500cfm range is all you'll need, having 2 will do more harm than good. your only feeding 200 cubic inches

 

[falcon fanatic]

At all this, what is your initial budget? I say initial because if you're like the rest of use you will continue to pour money into this thing for years to come, but you need a starting point. Are you flush enough to build the entire engine at once, or do you need to go in stages?

Having done the bolt-on thing myself, I have to say I'm dissapointed at the power that the header-exhaust-carb-ignition setup gets you on an otherwise stock engine. Yes my car is much faster and does run better, but if I had done the same type of work to a honda or a v-8, or just about any other engine, the thing would be a screamer. It's not. All of those mods are severely handicapped by the head. Where I to start from the beginning again, I would begin with extensive head modification and build out from there. I suspect an otherwise stock engine with a big valve ported head and nice ratio rockers would probably make more power than a stock head with a big carb and headers. Just a thought.

 

[xctasy]

The log is a dog, unless it has

1) an Offy triple intake intake.

2) a turbo.

3) Or nitrous

4) Or a an anti log Classic Inline alloy headswap.

The aero engine builders in the 1920's discovered that it was okay to have a few 90 degree bends in the intake, as long as there was one choke per cylinder, or if you had a really good intake system


Dollar for dollar, the best modification is nitrous, then a turbo, or then a better head. Since there are very serious tuning and durability issues over turbos and nitrous, a better head is the right option. If you not going to get a better head, get the Offy intake. It solves most of the head flow problems, and gains power by virture of the hugely improved "flow efficency". Having just one 1 or 2-bbl carb adminsiter fuel 11 inches from its source causes most of the problems getting very big big power increases. Re-read Jack's (MustangSix) Desktop Dyno simularions on the log head, and it flatlines at about 140 hp. Despite what he said over flow...its not just because the head flows poorly, its the fact that cylinders six and one are starved, while three and four get way too much, and the engine has to be tuned as a giant compromise. From information AMC generated back in the 70's on hotted up 1, 2 and four bbl 232 engines, flow efficiency could be around 65% on the outers, and 75% on the centre branches. A variance of more than 5% really hurts the average gas speed in the intake, and hurts peak power and torque unless you spend a lot of money on a scrambled cam profile like David Vizard used on his Minis.

That's not the case with the 2V or Offy. At anything over 2/3rd throttle, flow efficiency is close to 85% per cylinder, with no major difference from six and one to three and four. That's where the true power comes from. You can actually design a camshaft around "ratshit" flow figures in any cylinder head, but just adding more even fuel distribution is the best single thing to do if you dont want NOS or a turbo.


I'll repeat, if your not gonna go alloy Classic Inline 2v, then go the Offy intake. Its a solid gold performer.

 

[LaGrasta]

good info xecute.