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-   -   I Need Help With A Math Problem (https://classracer.com/classforum/showthread.php?t=84903)

jim morgan 05-21-2023 10:31 PM
Re: I Need Help With A Math Problem
 
Quote:
Originally Posted by Billy Nees (Post 680680)
and I'm pretty sure that a 383/330/281 in H/I/J WITH an available Edelbrock head could win any heads-up race that it got into.

and the same for a 426/365/300 in G/H/I WITH the same Edelbrock head available.
Billy that Edelbrock is not available and if you could find them they are not legal out of the box

Larry Hill 05-21-2023 11:07 PM
Re: I Need Help With A Math Problem
 
GUMP if I can get Dumbo to move in 60' a little quicker it will be ok. At the BG Sports I'm going to try a set of ported heads and a SS intake to see if I can wake him up.

Casey Miles 05-21-2023 11:18 PM
Re: I Need Help With A Math Problem
 
If I remember correctly, the 350/360 as rated at 390 or 400 HP back when we raced on street tires, around 1973. I remember that because nobody was racing them because of the HP rating. The '69 Z/28 302 is rated at 309 HP now and to race a '70 Z/28 which is rated at 320 HP, there is 110 LBS difference between the cars with the '70 having 48 cubic inches more with the same engine manifold, carb and heads. It's one of the biggest loss of power than any other engine combo.

Casey Miles
248H Stock

Adger Smith 05-22-2023 02:39 AM
Re: I Need Help With A Math Problem
 
Casey I didn't bother checking, but I'm pretty sure there was a difference in the intake lobes on the cam between '69 Z-302 and '70 Z-350. I think it was around .030 less on the 350.
Might be a little harder to feed those few extra Cu in.
Still soft...IMHO

Casey Miles 05-22-2023 11:10 AM
Re: I Need Help With A Math Problem
 
Quote:
Originally Posted by Adger Smith (Post 680700)
Casey I didn't bother checking, but I'm pretty sure there was a difference in the intake lobes on the cam between '69 Z-302 and '70 Z-350. I think it was around .030 less on the 350.
Might be a little harder to feed those few extra Cu in.
Still soft...IMHO
The now away cams, the .050 doesnt make a difference, if it was when we measured duration it might, but there's no substitute for cubic inches. If you use the same ratio of factory hp to the nhra rated, the 360 hp should be nhra 383 hp. The ratio is 1.06 on my advertised 290 hp to get to 309 nhra factored.

Casey Miles

Billy Nees 05-22-2023 05:46 PM
Re: I Need Help With A Math Problem
 
Quote:
Originally Posted by jim morgan (Post 680694)
Billy that Edelbrock is not available and if you could find them they are not legal out of the box
Hi Jim! I hope all is well! I'm pretty sure that IF someone were willing to pay enough money for a set, a set would appear. BUT, if they're "not legal out of the box" then why are they legal? ;-)

HR9121 05-23-2023 11:06 AM
Re: I Need Help With A Math Problem
 
Happy Birthday to the great mathematician Larry Hill!

Brett C 05-23-2023 08:38 PM
Re: I Need Help With A Math Problem
 
Quote:
Originally Posted by Larry Hill (Post 680673)
The point of the post was how does a combination receive a reduction of 35 Hp in Super Stock using the rules as written wit a maximum of 2.25%. The starting Hp would have to be 1555 Hp X 2.25 %=
34.9875 rounded up 35 Hp reduction. How does that happen and how did it happen on a 420hp reduced to 405 Hp.
Mr. Larry,
If this bothers you this much, why not go to the source instead of an open debate forum?

And Happy Birthday!?

Larry Hill 05-23-2023 10:13 PM
Re: I Need Help With A Math Problem
 
Brett.
I would really like to know who decided to go outside the rules and favor one or two racers. So do you think I would get any kind of answer asking NHRA, but I will try.
Thanks so much for the birthday wishes. We hope to see y’all soon. Safe travels and good luck.

Brett C 05-23-2023 10:43 PM
Re: I Need Help With A Math Problem
 
Quote:
Originally Posted by Larry Hill (Post 680784)
Brett.
I would really like to know who decided to go outside the rules and favor one or two racers. So do you think I would get any kind of answer asking NHRA, but I will try.
Thanks so much for the birthday wishes. We hope to see y’all soon. Safe travels and good luck.
Not sure of what answer NHRA would give you, but as much as I enjoy this site, the answer you seek will not come from here.
All the best!


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