True Horsepower Classes in NHRA

Dick Butler · 12-22-2015, 11:38 PM

How many Hp does a new 427, 425 hp rated Copo motor make? Anyone? Might that be a wonderful motor in an old car?

Mike Keener · 12-23-2015, 12:03 AM

Every dyno is different Dick but a reasonable figure for a 427/430 COPO is in the 810 range. A shootout 427/450 version is around 880 ish.

There again every dyno is different

Mike Keener · 12-23-2015, 12:08 AM

These figures in my previous post are for true Stock Eliminatior engines. A Super Stock motor may be worth another 75 or so if it is maxed out.

Dick Butler · 12-23-2015, 10:29 AM

Thanks. Was evaluating the motor for GT/AA versus older stuff. Bet it would be better as hp rating is newer.

Jim Bailey · 12-28-2015, 08:22 PM

Ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha .... you guys are killing me ...or you didn't see George Yego's Copo 350 run at Columbus in the CIC race ?

Dick Butler · 12-28-2015, 09:16 PM

No I didn't. The funny thing about it is??????

Jim Bailey · 12-29-2015, 10:25 AM

Dick, what's funny are the (real) hp numbers of the new cars. My guess is the "reported" Dyno numbers on the new car combos are soft. When you have a NA 350 COPO running mid Nines in junk air ....You don't need a Dyno to see it's making a bunch of power !

12-22-2015, 11:38 PM	#1
Dick Butler VIP Member Join Date: Oct 2002 Location: Richmond Indiana Posts: 1,196 Likes: 5 Liked 32 Times in 19 Posts	Re: True Horsepower Classes in NHRA How many Hp does a new 427, 425 hp rated Copo motor make? Anyone? Might that be a wonderful motor in an old car?

12-23-2015, 12:03 AM	#2
Mike Keener Member Join Date: Apr 2002 Posts: 294 Likes: 102 Liked 24 Times in 13 Posts	Re: True Horsepower Classes in NHRA Every dyno is different Dick but a reasonable figure for a 427/430 COPO is in the 810 range. A shootout 427/450 version is around 880 ish. There again every dyno is different __________________ Mike Keener A/S B/S C/SM

12-23-2015, 12:08 AM	#3
Mike Keener Member Join Date: Apr 2002 Posts: 294 Likes: 102 Liked 24 Times in 13 Posts	Re: True Horsepower Classes in NHRA These figures in my previous post are for true Stock Eliminatior engines. A Super Stock motor may be worth another 75 or so if it is maxed out. __________________ Mike Keener A/S B/S C/SM

12-23-2015, 10:29 AM	#4
Dick Butler VIP Member Join Date: Oct 2002 Location: Richmond Indiana Posts: 1,196 Likes: 5 Liked 32 Times in 19 Posts	Re: True Horsepower Classes in NHRA Thanks. Was evaluating the motor for GT/AA versus older stuff. Bet it would be better as hp rating is newer.

12-28-2015, 08:22 PM	#5
Jim Bailey Senior Member Join Date: Aug 2004 Posts: 674 Likes: 15 Liked 584 Times in 94 Posts	Re: True Horsepower Classes in NHRA Ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha .... you guys are killing me ...or you didn't see George Yego's Copo 350 run at Columbus in the CIC race ?

12-28-2015, 09:16 PM	#6
Dick Butler VIP Member Join Date: Oct 2002 Location: Richmond Indiana Posts: 1,196 Likes: 5 Liked 32 Times in 19 Posts	Re: True Horsepower Classes in NHRA No I didn't. The funny thing about it is??????

12-29-2015, 10:25 AM	#7
Jim Bailey Senior Member Join Date: Aug 2004 Posts: 674 Likes: 15 Liked 584 Times in 94 Posts	Re: True Horsepower Classes in NHRA Dick, what's funny are the (real) hp numbers of the new cars. My guess is the "reported" Dyno numbers on the new car combos are soft. When you have a NA 350 COPO running mid Nines in junk air ....You don't need a Dyno to see it's making a bunch of power !