273 Performance build possibilities.

[barbee6043]

Happiness is where we find it!!!!

 

[273]

Well if i can have fun with a 265 6 with a 4 speed behind it, a 273 v8 should be just as good

the smaller and less well supported the motor is. the more custom work is necessary and the higher the cost....



Dave

Agree, but other than pistons and can't use much more than a 1.88" valve is pretty much like building any other LA.

 

[273]

Alright AJ Jr.

Except my intent ain't to discourage the OP, If he likes the idea of a 400 hp @ 7000 rpm with 5.30 gears and wants to build it, I'm all for it, If not I'll try to help with option B.

I tend to agree with some of AJ's basic premises just not how he applies it.

 

[RustyRatRod]

Except my intent ain't to discourage the OP, If he likes the idea of a 400 hp @ 7000 rpm with 5.30 gears and wants to build it, I'm all for it, If not I'll try to help with option B.

I tend to agree with some of AJ's basic premises just not how he applies it.

What I'm saying is, much like AJ, you're throwing numbers out with zero basis in fact. Without knowing what the total combination is, you have no way of knowing power output numbers at any RPM, you're just guessing.

 

[toolmanmike]

Except my intent ain't to discourage the OP, If he likes the idea of a 400 hp @ 7000 rpm with 5.30 gears and wants to build it, I'm all for it, If not I'll try to help with option B.

I tend to agree with some of AJ's basic premises just not how he applies it.

I have followed a few hot rod 273 build threads here on the site and I have yet seen one get finished, ran on a dyno, or at the drag strip to measure horsepower. To the OP, build what you want , how you want but remember, it's only a 273.

 

[barbee6043]

I have followed a few hot rod 273 build threads here on the site and I have yet seen one get finished, ran on a dyno, or at the drag strip to measure horsepower. To the OP, build what you want , how you want but remember, it's only a 273.

And I told the guy, afterall,remember it is a FORD!!!!

 

[273]

What I'm saying is, much like AJ, you're throwing numbers out with zero basis in fact. Without knowing what the total combination is, you have no way of knowing power output numbers at any RPM, you're just guessing.

Yes I'm ball parking it to give him some idea of rpm needed, so he can choose if that is acceptable to him not meant to be dead on, why I used about around generally etc.. but it not a total guess is base of other builds of those hp #'s of various cids and lbs-ft per cid I've seen. Not guaranteeing that's where the OP will make it if he chooses so.

And the gearing I picked 110 mph seem like a decent number a lot cars are around, It's again just to give an idea of what he may expect to run at various engine rpms, wasn't picking his gears for him.

 

[jeff alder]

If your goal is unique things with a little more pep the 273 is a great choice. If you don't have one pick up a 66 or later unit. It would be more age appropriate for what you are doing and increase your intake manifold options. It would also make a sharp looking original install if you have the commando valve covers and air cleaner.

 

[BSB67]

……I was wondering if it is possible to build a solid built 273 with high RPM and decent power.

If you tell us your definition of high rpm and decent power along with your budget, then we will have a chance to give a reasonable answer.

 

[junkyardhero]

you have a 318, why not just build that and dress it up like a 273?

400hp is somewhat easily attainable from a 318. or you could even stroke one out to 390 and get there even easier.

a 360 makes that same 400 with a boat load torque to back it up for less dosh eight ways from sunday and twice on monday with no high rpm drama.

but to answer the initial question: yeah, sure you can build a high hp mega rpm monster 273 and spend a TON of cash doing it. the usable power band is going to be narrow and peaky and it'll have terrible street manners, but it'll be fun before it eats itself.

 

[stroker402]

I have followed a few hot rod 273 build threads here on the site and I have yet seen one get finished, ran on a dyno, or at the drag strip to measure horsepower. To the OP, build what you want , how you want but remember, it's only a 273.

waiting for it to warm up here in Wisconsin . then I will finish my 273 build.. short block and ported heads are all done.. previous engine rocked before and with a fresh rebuild and ported heads now, it will rock even more. LOL
This 273 will be finished.

 

[stroker402]

Not to start a war or high jack your post but I have been reading all the posts about the people commenting about how the 273 engine is the bottom of the barrel engine with no power/torque, well I'm here to tell you if you never built one, YOU have no clue of there potential. and you don't have to rev them to 6k to make power and ad big gears . You just have to know how to fine tune them and give it what it wants. cam gears intake carb ign .
I raced numerous built 340 - 360- mags and always come out front. you all have to clue...... lot of haters here . just say- n

 

[Dave999]

The usable power band is going to be narrow and peaky and it'll have terrible street manners, but it'll be fun before it eats itself.

Well there is a way to combat that. Something that is a tad gutless at low rpm with a 4bbl can be seriously revived by using port on port induction and appropriately long nicely merged, preferably equal length, headers....

but that is a whole lot of expense on 45mm weber IDFs x4 a custom built inlet or a search for an unobtanium one.

think of a 4.5 litre v8 as two 2.25 litre I4s and those carbs we designed exactly for that job

driveability from 800 rpm to 7000 with the right headers

8 x 500cc cylinder each with its own carb barrel....

Dave