Horsepower factors
 

I?m curious and lazy. Who has the highest factored horsepower over the factory rating. I?m would bet that some of the newer cars that have been hit hive the largest difference but some of out great minds on here can probably recite the numbers from memory. I don?t think I?m anywhere close but my 1989 Corvette 350/240 is NHRA rated at 270HP.
Mike McMahan 2543 G/SA

Re: Horsepower factors
 

Ignoring the FS/FSS cars...maybe one of the 1970's smog engines? The 1978 Volare 360/155 is rated at 289, for one example.

Re: Horsepower factors
 

Some of the smog motors got drastically refactored Ford 460 factory 220 NHRA rated 300 and there are other like this. I think there was a smogger 454 that had a huge increase also.

Re: Horsepower factors
 

Jim, one of the versions of the Ford 460 was factory rated at 198 HP, but NHRA quickly put it at 300 HP, when I believe, Glen Tinsley showed up at the Winternationals years ago, with a 85/86 Mustang with a 460 198HP, classed as GT/MA!

Re: Horsepower factors
 

Nhra factored your combo before anyone even raced it.

Re: Horsepower factors
 

NHRA factored a lot of combos before anyone even raced them! Some of those combos that have been factored have never been raced to this day!
Just another thing NHRA will never get around to looking at.

Re: Horsepower factors
 

I know that TStick and I's combo has been dinged many times. 1980 Chevy 305 currently sits at 232 from 180. I feel like that's pretty heroic!

Re: Horsepower factors
 

1983 305/150 Camaro now rated at 248 hp.

Re: Horsepower factors
 

1986 Firebird 305 Small cam 150/266 116 H.P.
Big cam 160/275 115 HP

Re: Horsepower factors
 

1973 Ford Torino wagon 429 197hp / 350hp. +153hp

Re: Horsepower factors
 

1969 427/430 HP L-88 in SS Automatic rated at 503 That is +73 HP
Probably not the highest, but up there.

Re: Horsepower factors
 

Well, I just go a call from my friend that is connected to NHRA.
I will just call him "Carnac the Magnificent"
Just because he is all knowing about class racing & a few other things..
He said my 73 HP example was nothing...
Just look at the 1972 Chevy 454/230 in Super Stock
It has a NHRA factor of 390 HP.
After looking at the specs... I can see why...

Re: Horsepower factors
 

Would that be the guy famous for starting the answer to every question with "now, let's open our rule book to page ........"?

Re: Horsepower factors
 

That has got to be the record! 153hp over stock! (notice it's not a chev or mopar...lol)

Re: Horsepower factors
 

When I purchased my 2022 572 COPO it was rated at 430 HP. Before it made it's first NHRA run at Gainesville it was refactoring to 500 HP! It is by far the worst factored factory hot rod.

Re: Horsepower factors
 

1973 Nova Hatchback was 350/175/287 +112hp

Re: Horsepower factors
 

We have a winner ^^^

A 77 % increase