BB Chev HP
 

Any suggestions on baseline HP needed in A or B/SA?

Re: BB Chev HP
 

I would guess 625 to 650 for 427.....But I am a Mopar
racer. It would depend on whose Dyno too.

Re: BB Chev HP
 

Of course every dyno can be wildly different, so it's hard to say very accurately. But my general rule of thumb is that if you can make 1.45 horsepower per NHRA HP Factor, you'll run decent. I would guess the guys at the top of their classes are roughly 1.6+ hp/Factor.

So an example would be a 375hp aluminum headed 396" Big Block rated at 405hp by NHRA with an auto transmission should be: 1.45 x 405 = 587hp. Start getting over that and you'll be more and more competitive.Bad boys are probably in the 645hp range.

Re: BB Chev HP
 

I'm running the 402" 70 Nova with Alum Heads HP Per NHRA is 415 which puts me at 601.75 HP. I have some work to do.

a decently preparedRe: BB Chev HP
 

I was talking about 427 engine. I was thinking 425/435 Combo.

On our stuff I usually figure about 1.5 x Rated to go
1 under on decently prepared stocker. Our Superstocker
take at least 2 x Facter for 1 under pass!



My .02
Your Mileage may vary

Re: BB Chev HP
 

The only big reference point I have seen someone post was a dyno sheet from Steve Wann's 413" motor in 2018. It made 674hp with a 405hp factor. That's a HUGE 1.66hp/factor - but that's also why he has one of (if not THE) fastest A/SA in the country.

Re: BB Chev HP
 

How do you get that much Hp without , AHEM, you know what I mean......

Re: BB Chev HP
 

A good 402 should made in the 590/ 620 to run pretty good,

Re: BB Chev HP
 

You don't. lol

Re: BB Chev HP
 

So the 64 thousand dollar question is: Picking a builder...…….

Re: BB Chev HP
 

Steve is a very formidable foe and drives real well. He is always fun to race. His daytime job is making power, his hobby is making lots of power.

Scott Gove and John Gray run real well, maybe they can shed some light. Jimmy D runs well when pushed.

Re: BB Chev HP
 

Actually the question is, figuring out your budget, the higher that is, the more your options will be. And if the skys the limit,and you want to be a big player, it will come down to less than you think.

Re: BB Chev HP
 

Forgive me.....Who is Steve?

Re: BB Chev HP
 

Steve Wann. Ever heard of him? :D

Re: BB Chev HP
 

See post #6
You asked the question...You're over the fence into Area 51 now..
Try to follow along ;-)

Re: BB Chev HP
 

Mr. Dano, let me help you out here. The first order of BUSINESS is contacting all your fellow competitors that run the same combination. Get everyone to agree to slow their car down in order to MANIPULATE the class averages. It’s always nice to get a HP reduction when NHRA opens the WELFARE line. Don’t be ashamed, almost everyone does it.

Re: BB Chev HP
 

Mike if you have only 587 you would be in trouble running most of the fast A an B cars. Not that I would know but I would guess your second number of 645 would be in the ball park. Barry

Re: BB Chev HP
 

MJ That combo will have never have any HP taken off of it. To many fast ones and too many A an B cars that they will run against in eliminations. It's to bad that is a tough HP rating.

I thought by now one of the fast 396 cars would have hit the 1.20 trigger. I believe it will only be a matter of time. To many of them and again there are a lot of fast A an B cars. I was hoping that John or Scott would play in A or B for a while. The AA has a tough index. How fast do you think the 2015 COPO's. I was hoping to find out at the baby Gators Barry

Re: BB Chev HP
 

Barry, I am sure you are correct. I can lead a horse to water,.....but I can’t make them drink.....

Re: BB Chev HP
 

Would I be off base if I believe the best 1969 396/375 Camaros that run aluminum heads and are able to run better than -1.20 (and they can) are making north of 700 HP?
Do the math.

Re: BB Chev HP
 

132 mph @ 3400=602 hp
133 mph @ 3400=616 hp
134 mph @ 3400=630 hp

132 mph @ 3600=638 hp
133 mph @ 3600=652 hp
134 mph @ 3600=682 hp

Re: BB Chev HP
 

There is only one Steve Wann.

I remember him wandering
about the pits when he probably was
around 13 telling everyone how he was
kick our butts.

AND sure enough for the last 30 +years.....He certainly has
done that!!

Re: BB Chev HP
 

You will need to add 200 lbs to that number. sorry didn't catch your second set of numbers
BP

Re: BB Chev HP
 

No, I know a certain A/S that ran 136 @ Pomona (1000) feet, it didn't make close to 700 HP. What helps a 375/396 is how it carries the power past peak, average HP.

Re: BB Chev HP
 

HP factor; 405 with aluminum heads
8.5 lbs in B/SA = 3,442.5 + 170 = 3,612.50
11.25 index - 1.4 = 9.85

The Elapsed Time (ET) Method
This method uses the vehicle weight and the elapsed time (ET) to finish a quarter mile (402.3 meters) on the formula of Horsepower = Weight (ET/5.825)3.

747 horsepower.

Re: BB Chev HP
 

9.29 @ 142.24 @ 3600 how much power using your formula?

Re: BB Chev HP
 

Approximately 850.

Re: BB Chev HP
 

Could you look into the possibility of HP determined by MPH over 1320, this seems to align with my dyno testing and others over the years. A perfect example of this would be over on the Number1GMfan thread.

Re: BB Chev HP
 

I completely agree with you there. I figured the 587 would put you around an -.80 under car, give or take a little. If a guy wants to be competitive in a heads up race against the top dogs - you'll need that 645 range. Just my perspective.

Re: BB Chev HP
 

None of those "top dogs" will run it 1320, to protect the number.
Maybe Scott Gove might.

Re: BB Chev HP
 

my combo for A is 3490 lbs, for B 3698 lbs. I would need enough hp for A and they are 9.8 - 9.90 ?
Am I figuring the class wrong? 402" with Alum Heads and Auto.....8.23 lbs per?

Re: BB Chev HP
 

While vehicle aerodynamics can cause this number to go up or down I think a good middle ground is 710 HP. With track weather BP=29.92 VP=0 Temp=60

Stan

Re: BB Chev HP
 

He has good genes....

Comes from a family of racers...

Always a fast and I do mean fast, plus he's good guy.....

Re: BB Chev HP
 

You're right. The A weight for you is 3490 and the B would be 3695 (they always round down to the nearest 5 lb spot).

Re: BB Chev HP
 

Frank I'm sure it depends on what round your in and what race your at. Several people have done it on red lights and in qualifying. I think it's nuts but it's their car and money. BP

Re: BB Chev HP
 

This is a factor from a B/SA 396 Camaro some years ago.
That one is Fast.
6.14/108.84
9.781/132.58
= 1297
Wonder of the RPM ;-)

Re: BB Chev HP
 

You never posted up how much HP it took.


Stan

Re: BB Chev HP
 

9.03 @143. 3400lb 1970 Buick Gs great air @ Cecil co.
Made 830hp Superflow dyno

Re: BB Chev HP
 

Was 3400 lb with driver? What was your 60 foot time?


Thanks,
Stan

Re: BB Chev HP
 

Friends car.
3400 with driver so they tell me.
1.22. 9.03@145.5