Anyone build a high RPM 273 using 2.02 size head?

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pishta said:
Lets just assume for this thread that your running in a stock class drag with a 'small' motor CID limit of 292 for the .010 over Ford guys....3xx need not apply.
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Ahhhh yes, NHRA modified production comes to mind! Lots of killer footage from the late 70s early 80s on YouTube. 10,000 rpm screamers....very cool
 
Syleng1 said:
I just built a 273 that will spin 8 but lightened my spring load and I keep the rev to 6 as the valve train was really tight and I was afraid that spring pressure was going to wipe out my mechanical cam.
Dyno was 355hp at 8 but with the new lighter springs it was 317hp at 6200rpm.
$10k to make that happen. Stock heads with some porting and stock sized valves. The larger valve will not help much because of the cylinder diameter is so small. Notching the block drops compression a tad.
I love my 273. But there is more HP for the same $ with the bigger CI motor.
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Do you mind if I ask what the cam specs were for that 273? Just was debating on feasible cam sizes for 273s with a friend of mine
 
This is my video I made several years ago of my 273 commando I rebuilt stock bore 273 with a isky cam solid 920 heads hooker headers 2.5 exhaust, 700holley dp, 4 speed 3.55 in a 65 barracuda S. It runs very strong . does have any problem taking out a built 340 or 360. just say n . "THE UNDER DOG"
 
273 said:
"Stock 273 block 8 sleeves and 3.75 bore for 292 cubic inches
Stock crank
5.4 H-beam Ford rods with EDM pin oiling
Diamond custom pistons with crappy 1/16 ring package
Wet sump oil pan and HV pump with oil crossover
Iron magnum style engine quest heads w/roller rockers, jomar girdles and pushrod oiling
Comp solid roller cam and lifters
Lots better parts today to make way more power"

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On post #109 is a picture of this 273 with the very heads and rocker arm system used during the dyno runs.

Is 426ci 360 a small block?

As noted in the thread, later the heads were used on a stroker engine with bigger valves and further modifications.
 
stroker402 said:
This is my video I made several years ago of my 273 commando I rebuilt stock bore 273 with a isky cam solid 920 heads hooker headers 2.5 exhaust, 700holley dp, 4 speed 3.55 in a 65 barracuda S. It runs very strong . does have any problem taking out a built 340 or 360. just say n . "THE UNDER DOG"
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Talk about a solid YouTube channel!
 
273 said:
"Stock 273 block 8 sleeves and 3.75 bore for 292 cubic inches
Stock crank
5.4 H-beam Ford rods with EDM pin oiling
Diamond custom pistons with crappy 1/16 ring package
Wet sump oil pan and HV pump with oil crossover
Iron magnum style engine quest heads w/roller rockers, jomar girdles and pushrod oiling
Comp solid roller cam and lifters
Lots better parts today to make way more power"

View attachment 1715864783


View attachment 1715864784
Click to expand...
Actually they were INDY/RHS LAX heads modified to run the stud mounter rocker arms. The dyno contest the heads were used in required the use of the INDY/RHS iron heads.
 
My 273 spins over 7k, stock intake and carb, heads are stock with 1.78-1.50 valves, and a .400 lift cam. runs 12.20s, you can make them run, just not always easy.

Cuda Sonoma .jpg
 
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