GREAT Deal On 572 COPO

[Larry Hill]

The new 572 COPO is just going to be a Index killer.
The crate motor is advertised at 720 Hp. with a smaller cam and a carburetor.
The 376 COPO is rated at 425 HP per NHRA Engine Specifications. Classification guide HP 415
The 427 COPO is rated at 470 HP per NHRA Engine Specifications.
The 572 COPO is rated at 500 HP per NHRA Engine Specifications.

Since I have my shoes of I will be able to do some simple math.

427-376 = 51 cu. in.
470-425 = 45 HP 470-415= 55 HP

45 HP/51 cu. in. = .882 HP per cu. in. . 55 HP/51 cu. in. = 1.078 HP per cu.in.

572-427 = 145 cu. in.
500-470 = 30 HP

30 HP /145 cu. in. = .207 HP per cu. in.

To me that is one heck of a deal, but is that fair to the rest of us?

GM thinks the 572 makes 1.25 HP per cu.in. How could NHRA assign such a low number to such a powerful engine?
I'm glad that the new COPO is here, but so disappointed at the HP rating.

I'm always surprised how much information I learn when I do a little home work, ie the 572 COPO is only 35 lbs heaver than a 302, 376, or 427 COPO's and it is 70 lbs lighter than the 350 blower COPO. And we wonder how the shipping weights get askew.

So if anyone has hopes of being number qualifier at this years US Nationals, get a 572 COPO or cross your fingers and hope the parachute deploys every qualifying run, because at .874 HP per cu.in. it an't going to happen!

From a rulebook "......providing the opportunity for fair competition; and
ever-present concern for safety"

[James Perrone]

Larry no different than the Fords And Mopars that started the stock eliminator evolution
Of BOGUS HP ratings
As I recall a new Denali has a higher HP rating on the valve cover that NHRA HP rated it for racing
Go figure

[GUMP]

Originally Posted by Larry Hill

The new 572 COPO is just going to be a Index killer.
The crate motor is advertised at 720 Hp. with a smaller cam and a carburetor.
The 376 COPO is rated at 425 HP per NHRA Engine Specifications. Classification guide HP 415
The 427 COPO is rated at 470 HP per NHRA Engine Specifications.
The 572 COPO is rated at 500 HP per NHRA Engine Specifications.

Since I have my shoes of I will be able to do some simple math.

427-376 = 51 cu. in.
470-425 = 45 HP 470-415= 55 HP

45 HP/51 cu. in. = .882 HP per cu. in. . 55 HP/51 cu. in. = 1.078 HP per cu.in.

572-427 = 145 cu. in.
500-470 = 30 HP

30 HP /145 cu. in. = .207 HP per cu. in.

To me that is one heck of a deal, but is that fair to the rest of us?

GM thinks the 572 makes 1.25 HP per cu.in. How could NHRA assign such a low number to such a powerful engine?
I'm glad that the new COPO is here, but so disappointed at the HP rating.

I'm always surprised how much information I learn when I do a little home work, ie the 572 COPO is only 35 lbs heaver than a 302, 376, or 427 COPO's and it is 70 lbs lighter than the 350 blower COPO. And we wonder how the shipping weights get askew.

So if anyone has hopes of being number qualifier at this years US Nationals, get a 572 COPO or cross your fingers and hope the parachute deploys every qualifying run, because at .874 HP per cu.in. it an't going to happen!

From a rulebook "......providing the opportunity for fair competition; and
ever-present concern for safety"

Larry,

You are WAY too smart to be posting something this dumb.....

[Mike Gray]

A little bench racing info -
Max. bore 4.64, Max stroke 4.39 = 593.9ci Solid roller .731 lift, 2.25/1.88 valves dome piston, max compression 13.83 rated at 500hp in aa/s 3920lb and ss/a 3190lb.

[jamie2370]

I wondered how long it would take Darren to respond lol. I am not sure that combo is near as fast as Larry is making it sound. As I have seen one run at a mineshaft race and honestly not near as impressive as those calculations make it sound. Not saying it doesn't have some potential but.....

[Tom P]

Originally Posted by Mike Gray

A little bench racing info -
Max. bore 4.64, Max stroke 4.39 = 593.9ci Solid roller .731 lift, 2.25/1.88 valves dome piston, max compression 13.83 rated at 500hp in aa/s 3920lb and ss/a 3190lb.

And the 90mm throttle body would be over 1100 cfm

[countrypuppy4865]

Originally Posted by Mike Gray

A little bench racing info -
Max. bore 4.64, Max stroke 4.39 = 593.9ci Solid roller .731 lift, 2.25/1.88 valves dome piston, max compression 13.83 rated at 500hp in aa/s 3920lb and ss/a 3190lb.

Mike this is an FS car

[Tom P]

Is anyone running one yet?

[herbjr]

Letters have caused HP to be low for years,

[Robin Lawrence]

Originally Posted by Tom P

Is anyone running one yet?

Steve Foley is driving the first delivered 572 COPO at the Baby Gators and Gators.

I had the pleasure of racing him in class on Thursday. I red lighted and then lifted to his full run.

He ran 9.32 on what I think is a 9.70 index. The correction was 1.01 IRRC correctly.

They worked to get it to run that number. It's going to take a little more to make it a killer combination.

Robin