Super Stock Weight Breaks

Great spread sheet Bill, Thanks!

Can anybody tell me why NHRA does'nt allow wagons in GT? Have they ever allowed them since the GT class inception? And, I see only a select number of Chrysler small and big blocks have a GT rating in the classification guide..does that mean they are the only Chrysler engines allowed to run GT?

Thanks, Gordie

[Bench Racer]

Bill I got it down loaded, thanks a bunch. Don Jackson

[Jeff Lee]

Ahhhh...got it! Now can somebody explain why GT/LA has a 11.85 index and GT/L has a 11.60 index?
And looking at the chart with a 3126 shipping weight and a 1969 390/340/407 doesn't fit in in any GT class?

Thanks, that's a really useful tool!

[Bill Harris]

Jeff and Brian, you both have a situation that wasn't handled well by the spreadsheet. In both cases the HP/Weight is less than 8.0. GT/A is from 8.0 to 8.49. When the weight break was less than 8.0 the spreadsheet didn't know what to do. I made some changes and there is a new version at:

http://www.employees.org/~bhracing/g...ulator_1p1.xls

This version will flag combinations that have breaks below 8.0 and also shows the calculated weight break.

Thanks for the feedback. You fast guys always break things..!!

[John Lang]

Bill Harris! I just want to thank you for the effort you put into this, but according to this formula the 440-6Pak would have to make around 800 HPto be somwhat competetive! Theres as much chance of that happening as me looseing 175#! I haven't weighed that since i was born! For SS/CA my car has to weigh 3670 # with driver, that's with a Hemi , that makes about 850 HP. The poeple that i've talked to didn't know how to do the GT thing in reverse, as in late model eng in older body....Thanks a Bunch, John Lang

[Chris Hill]

John the 440 six pack in super stock is 385 hp in stock its at 405 e body 411 b body.

[Jeff Lee]

Bill...Again, thanks a lot, great program! Using the '70 AMX @ 3223 shipping weight and the '69 390 cross-ram engine, the program illustrates how not all cars (John Lang also) are not suitable for SS/GT. A SS/B cross-ram legal '69 AMX is 610#'s lighter than the GT/AA equivalent, thus, can never be a player. However, if you drop a '69 AMC 290 into the '70 AMX with an auto transmission for GT/LA, you would have a seriously decent SS/GT car, even against the late-model sheetmetal. At least I think so...and there will always be advantages to using the late-model FWD conversions.
Since I'm a stick-only racer, GT/L is hampered by a .25 harder index over GT/LA.
Guess if I ever want to race with a pair of Holley's on my 390 I have to switch the front-end to a '69 model. Someday.....

Everybody needs to add this program to their favorites, especially NHRA!

[Bill Harris]

Hey Gordie, Just because there isn't a specific HP for SS/GT in the classification guide for a particular engine doesn't mean that it can't be used in GT. Those engines that have a GT only HP rating are due to AHFS hits on combinations that use that engine in a GT car. If a GT car uses an engine and goes too fast, the NHRA will give HP to that engine when it is used in a GT car, but doesn't hit the traditional S/S cars that use the same engine. That is shown in the classification guide with a separate GT HP line. If there isn't a GT specific entry, you use the regular S/S rating for the engine.

[Bryan Broaddus]

Bill,

Thanks again for the spreadsheet!! It is much quicker than the way I had done it in the past!

Bryan

[JRyan]

Bill,

The GT/MA index is 12.05. You have it the same as GT/LA at 11.85. But thanks, it sure works slick.

Jerry