'1966' Mopar 273/235 HP vs. Chevy 283/220 HP

[69 Cuda 440]

Much has been made about the 'Heads-Up' Match between the
66' Barracuda 273/235 HP vs. The 66' Chevy II 283/220 HP.

Back in the day in 1966, the Barracuda and Chevy II fell into the
same weight bracket {12.50 - 13.99 Wt/Hp} which was the
G/S NHRA Class, and later F/S Class in 1967.

Later, in 1968 - the Stock Classes were changed, and the Barracuda
fell into J/S and the Chevy II fit into K/S.

But for that 2-Year run, there were many Head-to-Head battles
between the two Small-Blocks.

283/220 HP----------------------------------------------------273/235 HP
* 3.875" Bore------------------------------------------------ * 3.63" Bore
* 3.000" Stroke---------------------------------------------- * 3.31" Stroke
* 9.25-1 Compression-Ratio {Flat-Top Pistons}----------- * 10.5-1 Compression-Ratio {Dome +.140"}

Cylinder Head------------------------------------------------Cylinder Head
* 1.72" Intake---------------------------------------------- * 1.78" Intake
* 1.50" Exhaust--------------------------------------------- * 1.50 " Exhaust
* 54.9 CC Combustion Chamber--------------------------- * 57.3 CC Combustion Chamber
* 140 CC {Intake Port Size}------------------------------- * 127 CC {Intake Port Size}
* 60 CC {Exhaust Port Size}------------------------------- * 60 CC {Exhaust Port Size}

Camshaft---------------------------------------------------- Camshaft
* Hydraulic-------------------------------------------------- * Solid
*.399"/.399" Lift-------------------------------------------- *.425/.425" Lift
* 258*/260* Duration-------------------------------------- * 248*/248* Duration
* 49* Overlap---------------------------------------------- * 26* Overlap

Valve Springs---------------------------------------------- Valve Springs
Valve Open = #170 lbs.----------------------------------- Valve Open = #210 lbs.
Valve Closed = #75 lbs.----------------------------------- Valve Closed = #98 lbs.

Carburetor-------------------------------------------------- Carburetor
* Rochester 4-GC----------------------------------------- * Carter AFB
* 1 7/16" / 1 7/16"--------------------------------------- * 1 7/16" / 1 9/16"
* 486 CFM Rating----------------------------------------- * 500 CFM Rating

Intake------------------------------------------------------- Intake
* Cast Iron------------------------------------------------ * Cast Iron
* Dual-Plane 'Medium-Riser'----------------------------- * Single-Plane 'H-Shape' Low-Design

 

[Back in Time]

And the results were ?

 

[dano]

Did the 289 Falcon or Comet run against them too?

 

[69 Cuda 440]

Head-to-Head

The 66' Barracuda {#2940 lbs.} usually outran the 66' Chevy Nova SS {#2870 lbs.}

The 273/235 Barracuda {12.51 Wt/Hp} pulled better 'out-of-the-hole' over the
283/220 Chevy Nova {13.04 Wt/Hp}.

On the question of the Ford Falcon,

The 1966 Falcon {289/200 HP} 'Two-Barrel' was classed in the {12.50 - 13.99 Wt/Hp} Class
in 1966 and 1967 - with both the 66' Barracuda and 66' Chevy Nova SS.

But only with the 66' Chevy Nova 283/220 HP in the 1968 Season and later.

On the 1966 Mercury Comet 'Model 202' {289/225 HP}, I believe the Comet was
also classed with the 66' Barracuda and 66' Chevy Nova in both 1966 and 1967.

 

[69 Cuda 440]

Heads Up Match Race

 

[OldmanRick]

I know we're talking racing here, and gearing and such can make up for a lot, but the standard 283 4bbl was a slug. Not enough stroke for the bottom, and not enough cam, ("broomstick") for the top. Put that combo in front of a PG and fuggit about it.....:mrgreen:.

 

[HotLines]

I was brought up in NY and in 1964 I bought and ran a 64 Chevelle 283 220 hp 4 speed after installing and utilizing 4:30 Buick gears in the rear, I believe the class was H stock yet It ran consistent 13. 0's and was running within the national record. It wound up getting stolen and than found missing everything, guy was caught and prosecuted. Afterwards I moved to SoCal..

 

[67Dart273]

Put that combo in front of a PG and fuggit about it.....:mrgreen:.

I love to run into some of my old friends who no longer follow cars much. Mention that 'glides are now a much used hi horse box and they look at me as if I'm nutz

My first 57 Chev was a 265 2bbl, PG. I guess you don't know what a slug you have until..........................

 

[69 Cuda 440]

I know what the 283/220 HP could and couldn't do.

In 1968, my father was running a 67' 273/235 HP Barracuda in 'J/S', and a friend of ours was
running a 66' Chevy II 283/220 HP in 'K/S'.

The 283/220 HP was about 3/10's slower in the Quarter-Mile, despite the car being
about 70 lbs. lighter.

The 'best' of the 283 Stockers back then, {not including the Fuel-Injected combination} was
the 1961 Corvette 283/230 HP, which also ran with the 273/235 HP Barracuda's and Darts.

 

[69 Cuda 440]

Much has been made about the 'Heads-Up' Match between the
66' Barracuda 273/235 HP vs. The 66' Chevy II 283/220 HP.

Back in the day in 1966, the Barracuda and Chevy II fell into the
same weight bracket {12.50 - 13.99 Wt/Hp} which was the
G/S NHRA Class, and later F/S Class in 1967.

Later, in 1968 - the Stock Classes were changed, and the Barracuda
fell into J/S and the Chevy II fit into K/S.

But for that 2-Year run, there were many Head-to-Head battles
between the two Small-Blocks.

283/220 HP----------------------------------------------------273/235 HP
* 3.875" Bore------------------------------------------------ * 3.63" Bore
* 3.000" Stroke---------------------------------------------- * 3.31" Stroke
* 9.25-1 Compression-Ratio {Flat-Top w/Notches}------- * 10.5-1 Compression-Ratio {Dome +.140"}

Cylinder Head------------------------------------------------Cylinder Head
* 1.72" Intake---------------------------------------------- * 1.78" Intake
* 1.50" Exhaust--------------------------------------------- * 1.50 " Exhaust
* 54.9 CC Combustion Chamber--------------------------- * 57.3 CC Combustion Chamber
* 140 CC {Intake Port Size}------------------------------- * 127 CC {Intake Port Size}
* 60 CC {Exhaust Port Size}------------------------------- * 60 CC {Exhaust Port Size}

Camshaft---------------------------------------------------- Camshaft
* Hydraulic-------------------------------------------------- * Solid
*.399"/.399" Lift-------------------------------------------- *.425/.425" Lift
* 258*/260* Duration-------------------------------------- * 248*/248* Duration
* 49* Overlap---------------------------------------------- * 26* Overlap

Valve Springs---------------------------------------------- Valve Springs
Valve Open = #170 lbs.----------------------------------- Valve Open = #210 lbs.
Valve Closed = #75 lbs.----------------------------------- Valve Closed = #98 lbs.

Carburetor-------------------------------------------------- Carburetor
* Rochester 4-GC----------------------------------------- * Carter AFB
* 1 7/16" / 1 7/16"--------------------------------------- * 1 7/16" / 1 9/16"
* 486 CFM Rating----------------------------------------- * 500 CFM Rating

Intake------------------------------------------------------- Intake
* Cast Iron------------------------------------------------ * Cast Iron
* Dual-Plane 'Medium-Riser'----------------------------- * Single-Plane 'H-Shape' Low-Design

Fairly Close in Specifications

 

[hemicop]

An interesting & good argument if you're talking class racing, but the majority, back then & now, don't race "class" so the argument is kinda moot. The REAL combo back then was the '66 Chevy/L79 engine combo. which, sadly, even stomped the Hemis.
Now that to me, would be more fair---top of the line smallblocks versus each other in the "econo-box" body.

 

[69 Cuda 440]

The 1961 Corvette 283/230 HP was an equal runner to the 273/235 HP

It came though with a little more compression than the 283/220 HP..

* 283/230 HP.....9.50--1
* 283/220 HP.... 9.25--1

And the Corvette came though with a Carter WCFB 385 CFM Carburetor which
performed a little better than higher rated 486 CFM Rochester 4-GC on the
1966 283 engine.

 

[1970Duster]

Those L-79 motors are little monsters!

 

[69 Cuda 440]

NHRA Horsepower Factor Changes

Super/Stock
* 273/235 HP {-5 HP} changed to 230 HP
* 283/220 HP {+10 HP} changed to 230 HP

Stock
* 273/235 HP {-25 HP} changed to 210 HP
* 283/220 HP {+6 HP} changed to 226 HP