LS1 Horsepower Factors

[442OLDS]

If a Firebird,GTO,Camaro,and Corvette all have different horsepower factors because they are different body styles,then fine.

So how about a lower horsepower factor for a convertible?
The top blows up in the wind and needs 40 horsepower off?

[Jack Matyas]

Originally Posted by 442OLDS

If a Firebird,GTO,Camaro,and Corvette all have different horsepower factors because they are different body styles,then fine.

So how about a lower horsepower factor for a convertible?
The top blows up in the wind and needs 40 horsepower off?

Well we certainly agree on that ! ! And while you're writing to the NHRA please add my name to the list .Why you ask ?? Tell them i'd like a reduction of horsepower for my COPO convertible and i'm sure it makes more MPH so I should get a bigger reduction than you . Happy New Year to me .........

[jmcarter]

Originally Posted by JIM MARSHALL

I don’t know what 455 you guys are referring to but a quick look at the guide shows the last time one had an increase or decrease was 2008.
That being said the late George Thompson raced a 1972 Olds 442 in G/SA with a 455 and could easily go a second under if he wanted to. I don’t have the answer but I do know I run the combo that has the greatest chance for success.

Off topic of course but wondering where George’s Olds ended up? I talked to him at Fontana in 2017 and it was a pretty cool car, he indicated that it would go far faster than he’d ever shown. Probably the last time he ran the car. We had a great conversation, great guy.

[442OLDS]

Originally Posted by jmcarter

Off topic of course but wondering where George’s Olds ended up? I talked to him at Fontana in 2017 and it was a pretty cool car, he indicated that it would go far faster than he’d ever shown. Probably the last time he ran the car. We had a great conversation, great guy.

George's car was bought by a guy who lives in Moline,Illinois. It was running really good, and he blew the motor a few years ago and hasn't been back out since.I understand that he is planning to be back this year, as it is quite a long process to build an engine from scratch.
I met George at the Winternationals about 10 years ago.Great guy with a long history of fast Oldsmobiles.I remember asking him about his car and whose pistons he was running.He said Arias.After he told me that,I didn't ask anymore questions.The small valve and low compression combo is probably a much better combo for Olds 455 racers.

[Chevy55]

NHRA Tech Department makes corrections/updates to the Stock Car Classification Guide

Jan. 13, 2023

The NHRA Technical Department recently made changes to the Class Guide.

Chev 66-69 396 325/324 change to 396 325/316
Chev 68-69 396 325/374 change to 396 325/363
Chev 68-69 396 325/384 change to 396 325/373
Chev 1968 396 350/340 change to 396 350/335
Chev 68-69 396 350/360 change to 396 350/358
Chev 68-69 396 350/370 change to 396 350/368
Dodge 1962 413 385/394 change to 413 385/390



https://www.nhraracer.com/content/general.asp?articleid=72710&zoneid=132

[442OLDS]

Originally Posted by Chevy55

NHRA Tech Department makes corrections/updates to the Stock Car Classification Guide

Jan. 13, 2023

The NHRA Technical Department recently made changes to the Class Guide.

Chev 66-69 396 325/324 change to 396 325/316
Chev 68-69 396 325/374 change to 396 325/363
Chev 68-69 396 325/384 change to 396 325/373
Chev 1968 396 350/340 change to 396 350/335
Chev 68-69 396 350/360 change to 396 350/358
Chev 68-69 396 350/370 change to 396 350/368
Dodge 1962 413 385/394 change to 413 385/390



https://www.nhraracer.com/content/general.asp?articleid=72710&zoneid=132

Quite interesting what you posted, but you really should start another thread as I don't see that it has anything to do with LS1 factors.
Although it does look like they are consolidating factors and giving the engines the lower ones.
So the LS1 Firebirds that are at 381,should go back to 340 along with the Corvettes using the same logic.

Where is the dislike button?

Originally Posted by Chevy55

NHRA Tech Department makes corrections/updates to the Stock Car Classification Guide

Jan. 13, 2023

The NHRA Technical Department recently made changes to the Class Guide.

Chev 66-69 396 325/324 change to 396 325/316
Chev 68-69 396 325/374 change to 396 325/363
Chev 68-69 396 325/384 change to 396 325/373
Chev 1968 396 350/340 change to 396 350/335
Chev 68-69 396 350/360 change to 396 350/358
Chev 68-69 396 350/370 change to 396 350/368
Dodge 1962 413 385/394 change to 413 385/390



https://www.nhraracer.com/content/general.asp?articleid=72710&zoneid=132

[GTX JOHN]

George Thomson passed away of Covid in Dec. 2020 in Lake
Havasu Arizona. I was best man at his Wedding years ago. He
was a close friend and a lot of the reason my cars run pretty well even
today. He also ran a Killer 73 Mustang 351 that was 1 qualifier when
he wanted it to be. There is nothing he could not make fly!
He called me the day he died and told me he would
not make it to the end of the year!
I talked to the new owner at St. Louis points race two year ago = Nice
Mature Gentleman and it was running fine then!

RIP

[e vassar]

Well how the LS1 GTO landed in F/SA @3740 lbs and 40HP less is interesting for sure not as aerodynamic? No Ram Air?
But its not the GTO that's been feeding on their GM cousins Camaro/Firebird, It's the LS1 C5 Vette. Heads-up about 260lbs lighter....who needs ram air?

[David Lee]

Originally Posted by GTX JOHN

George Thomson passed away of Covid in Dec. 2020 in Lake
Havasu Arizona. I was best man at his Wedding years ago. He
was a close friend and a lot of the reason my cars run pretty well even
today. He also ran a Killer 73 Mustang 351 that was 1 qualifier when
he wanted it to be. There is nothing he could not make fly!
He called me the day he died and told me he would
not make it to the end of the year!

RIP

i am sorry for your loss, i met george years ago.