For all the 273 Naysayers

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dart4forte

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At Brainard


33 5008 SS/K Matthew Steen, Marshall MN, '66 Valiant 10.664 11.00 -0.336

That little 273 is flying!!!!
 
You'll not see any naysayin outta me. I like all the Mopar engines...cept the new ones.
 
Yeah well 14 to 1 compression can do wonders, lol

Sure it has some bad boy heads on it too


I doubt he's running that high of compression but given the fact that he's running some carefully massaged heads he still has to run the stock carb. No matter how you cut it he's still running a 273.
 
Matt has been beating up on national records for two years now. That car is running hard.

See this thread.

And this one here.
 
Matt has been beating up on national records for two years now. That car is running hard.

See this thread.

And this one here.

Yes, I forgot to mention that Matt is a board member. Kinda cool going back and looking at those old threads. I'm sure Matt is running a roller cam, 302 heads (allowed), a liberty trans and shifter with probably 5.86's. Still he has to run that stock Carter AFB.

I would sure like to get a set of Matt's heads for my 64 Dart

As for Angela Bushmaker, they started running the Edelbrack D4B last year in that NHRA allowed it. Car rans even faster.
 
Saw a 273 dart featured 15 years ago that ran in the 10's. Think it was hot rod magazine. Guy did it to be different.

So how streetable is this 10 sec 273? How much cash did it take to get that 273 in the 10's?? Think when people saying stroke them it's because it's cheaper to get where ya want to get by going bigger cubes.
 
Saw a 273 dart featured 15 years ago that ran in the 10's. Think it was hot rod magazine. Guy did it to be different.

So how streetable is this 10 sec 273? How much cash did it take to get that 273 in the 10's?? Think when people saying stroke them it's because it's cheaper to get where ya want to get by going bigger cubes.

It's not the money as much as it is experience, knowledge and skills in getting the car to go fast. There a lot of things you can do to get the car faster without breaking the bank such as ring combo, reciprocating weight, getting the maximum amount of flow out of a set of stock heads etc. I tried to buy a set of 920 heads from a SS racer one time and he wanted $4500 for the heads. I'm sure he had that much into the R&D on those heads. The heads probably would of outflowed my motor combo thus I would be wasting my money. Why have a .600 lift cam in a motor when the glow of the heads you run flatten out at .500 of lift? Most of us just throw parts at a motor hoping to get the best bang for the buck. The skill is knowing what you can do with a stock part to go fast. Remember this is not a steet engine, full tilt race motor and chassis.
 
Why have a .600 lift cam in a motor when the glow of the heads you run flatten out at .500 of lift?



Cause the .600 lift gets to .500 quicker and stays above .500 longer.

Its amazing a single afb stock flow carb can pull those numbers in that small of a motor. What his redline, 8,000 plus?
 
hi, in S/S , the port volumes and chamber volumes have to be at the stock sizes. like wise valve size also. comp ratio and top of piston have to be same
as came stock. in other words, it has no 14to 1 comp ratio. the heads are reworked to get highest port velocity and flow needed. the stock carb is required. the fact is, its fuel curve in carb that makes it go fast. class racers are very good at finding the hidden power in a combination. they're not parts changers like most guys. any one can change parts to go faster. just food for thought.
 
Perf, I'm not sure that's right. Stock Eliminator yes, Super Stock, you can change the heads radically, different types pf pistons, manifolding... only thing is the factory carb(s). At least that's what I recall when my buddy switched from S/E to SS. A 273 car running SS will not be able to drive on the street for long. There's more smoke and mirros with those cars than you'd believe.
 
Funny, I read this post, then was out and about yesterday and saw a Modified Production resto rod getting washed at a local shop... Straight axle, T-Bolt hood scoop, etc on a 60s Falcon. Decals, paint, M/T type wheels, the works. The car looked awesome. I didn't have time to stop but I should have.
 
hi, in S/S , the port volumes and chamber volumes have to be at the stock sizes. like wise valve size also. comp ratio and top of piston have to be same
as came stock. in other words, it has no 14to 1 comp ratio. the heads are reworked to get highest port velocity and flow needed. the stock carb is required. the fact is, its fuel curve in carb that makes it go fast. class racers are very good at finding the hidden power in a combination. they're not parts changers like most guys. any one can change parts to go faster. just food for thought.

Yea brother! Not sure what is legal now, but compression ratio at minimum NHRA blueprint was 11.5 to 1 for the 273 hipo. When my friends were into Super Stock and Stock class racing: cam / valvetrain; intake manifold; Pistons; Rings; and Exhaust was all you could legally change. Valve job was limited. And if it even looked like you did any porting on the heads, you were disqualified. It was supposed to show the upper limits of what a basically stock engine could run with just those changes. That was a long time ago. I was always amazed how fast they would go. As I remember you had to contact NHRA to get the rules and acceptable casting numbers and blueprint specifications for your engine.
 
hi, in S/S you can port, grind , weld , epoxy ports all you want, after you are done, they must meet the stock volumes period!!!no larger allowed !! this seperates the men from the boys as to cylindr head work. the top of the piston must look and measure same as a stock!! no bigger domes or other designs allowed. the deck heights have to be same as stock are. chamber volimes have to be larger or same as stock size. NHRA has all that listed in blueprint specs. stock valves sizes required, period!! the 273 has a 1.78 and a 1.50 valve. int manifold is pretty much wide open. same with cam shaft and valve train.true, not streetable, maybe, but damn fast. i've seen stroker motor cars, that were not streetable also. just food for thought.
 
Perf - Yup. And a SE or SS car is not the engine alone. I'm not saying it's not cool as hell and fast, but I am saying a post comparing it to what would typically be a street/strip car with a 273 is not even comparing apples to oranges. More like apples to dandilions. They are (or should be) that much different. That car, or any SS car, is made to accelerate and make use of every ounce of power. The tires, shocks, suspension, transmission, clutch or convertor, fuel system,, etc are all very carefully scienced to get that result. Take that engine out, stick it in a cruise night '67 Dart with a set of 3.91s in it, and it wont run anywhere close to that...lol
 
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