minimum weight

cyclecyko · 09-29-2008, 11:58 AM

Between the website and the rule book the nhra could not have made minimum weight more confusing.
I'm looking for my 325hp/383 in a 66 coronet wagon. The website says 3936 lbs but the rule book makes it out to be like 4500 lbs. The car is completely stock weighed less than 4000 lbs.

Am I retarded here ?

5919 SSKA · 09-29-2008, 12:10 PM

NHRA Corrected Hp x Class wt + 170 (for driver).

Bill Harris · 09-29-2008, 12:21 PM

maybe not retarded, maybe just a victim of our fabulous educational system... 66 Coronet SW with a 383/325HP, NHRA rated at 280 HP for stock depends on the trim of the wagon.

Coronet Deluxe has a shipping weight of 3913 and a break of 13.98. It is a natural L (13.50 to 13.99). NHRA allows you to run at the bottom of your natural class so in L your minimum weight is (13.5*280)+170= 3950 lbs (the 170 is always added for the driver). NHRA also allows you to go up or down one class from the natural class. So you can also run K at a min of (13.0*280)+170=3810 and M at a min of (14.0+280)+170=4090.

Coronet 440 6 passenger has a shipping weight of 3936 and a break of 14.06 while the 9 passenger has a shipping weight of 3949 and a break of 14.10.

Both the 440 versions are natural M (14.00 to 14.49) and could also run L at 3950 lbs min, M at 4090 lbs min, or N at (14.5*280)+170 = 4230lbs min.

Hope that helps you out!

cyclecyko · 09-29-2008, 12:56 PM

Thanks Bill, I was not aware of the hordepower being corrected to 280. I guess I was also unclear on how to factor everything. Do you think this will be a competitive combo ? I haven't seen many 383 chryslers in stock.

Bill Harris · 09-29-2008, 01:15 PM

I'm not the right guy to evaluate Chrysler combos, (or any others for that matter). It seems like 280 HP is fairly low for the engine specs, but that 280 was last changed in June 2003. It would be interesting to know whether the adjustment was up or down and why. Someone has been messing with that engine in super stock since it was just changed to 290 HP last June. Might have been a letter asking for an adjustment or someone might have run too fast with it.

The only experience I have with a 383 is trying to avoid getting a heads-up against Jerry Bennett's '62 Savoy with the 383/343 engine. That one has two AFBs and a bit more cam than your engine, but it also has a 320 HP NHRA rating, 40 HP more than yours.

There are lots of Chrysler guys on this site, maybe they will chime in.

Jeff Lee · 09-29-2008, 01:17 PM

The shop I use built a 280 (corrected) HP 383. It has been #1 qualifier on more than one occassion this year. I thought the 426W-4bbl was available as an option but apparently it is not. That would be an engine up to 1965 and is factored to 300 HP.

cyclecyko · 09-29-2008, 01:20 PM

I've flowed a stock chrysler heads on a superflow. 2.3 hp per cfm is generaly thought of as the maximum hp for a givin head. That means my combo would be maxed out at about 480 hp. The car is probably only going to run about 0.70 under the index. Again mabey I'm wrong my flow numbers are from a head with a factory valve job. A set of heads done right migh make 500hp. Any input is appreciated.

Ryck Campbell · 09-29-2008, 01:37 PM

The 3936 that you are referencing is the shipping weight of a 1966 Coronet 440 station wagon 6 passenger. For stock eliminator, the 383 325 hp is rerated to 280 hp. That makes it a natural "M" with a p/w factor of 14.06. Since you can move up 1 class and down 1 class, it would have to weigh 3950 in "L", 4090 in "M" or 4230 in "N", all including the driver.

hope this helps,

Ryck Campbell
NHRA D-1 Tech Director

cyclecyko · 09-29-2008, 05:16 PM

I assume that the 318 combo for this car would have to run a polly 318. does any one know this to be true or are they allowing LA motors ?

John Lang · 09-30-2008, 12:53 PM

Cyclecyko, Stick with the 383/w 4bbl. Check out Jim Hale's 67 cuda with a 383 4bbl!!!!! He's able to run a second under at will. That would work well in your wagon I feel! Using the 915 heads, with the smaller ex valve,1.60 could be a competitive combo. Make sure you have a well setup rear ..Good Luck, John Lang. A Mopar lover.

09-29-2008, 12:10 PM	#2
5919 SSKA Member Join Date: May 2006 Location: Sauk Rapids, MN Posts: 284 Likes: 20 Liked 19 Times in 5 Posts	Re: minimum weight NHRA Corrected Hp x Class wt + 170 (for driver). __________________ Racing web page

09-29-2008, 12:21 PM	#3
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 420 Likes: 13 Liked 26 Times in 13 Posts	Re: minimum weight maybe not retarded, maybe just a victim of our fabulous educational system... 66 Coronet SW with a 383/325HP, NHRA rated at 280 HP for stock depends on the trim of the wagon. Coronet Deluxe has a shipping weight of 3913 and a break of 13.98. It is a natural L (13.50 to 13.99). NHRA allows you to run at the bottom of your natural class so in L your minimum weight is (13.5280)+170= 3950 lbs (the 170 is always added for the driver). NHRA also allows you to go up or down one class from the natural class. So you can also run K at a min of (13.0280)+170=3810 and M at a min of (14.0+280)+170=4090. Coronet 440 6 passenger has a shipping weight of 3936 and a break of 14.06 while the 9 passenger has a shipping weight of 3949 and a break of 14.10. Both the 440 versions are natural M (14.00 to 14.49) and could also run L at 3950 lbs min, M at 4090 lbs min, or N at (14.5*280)+170 = 4230lbs min. Hope that helps you out! __________________ Bill Harris ex 2172 STK ex 2272 S/S

09-29-2008, 12:56 PM	#4
cyclecyko Junior Member Join Date: Dec 2007 Location: houston tx Posts: 36 Likes: 0 Liked 0 Times in 0 Posts	Re: minimum weight Thanks Bill, I was not aware of the hordepower being corrected to 280. I guess I was also unclear on how to factor everything. Do you think this will be a competitive combo ? I haven't seen many 383 chryslers in stock.

09-29-2008, 01:15 PM	#5
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 420 Likes: 13 Liked 26 Times in 13 Posts	Re: minimum weight I'm not the right guy to evaluate Chrysler combos, (or any others for that matter). It seems like 280 HP is fairly low for the engine specs, but that 280 was last changed in June 2003. It would be interesting to know whether the adjustment was up or down and why. Someone has been messing with that engine in super stock since it was just changed to 290 HP last June. Might have been a letter asking for an adjustment or someone might have run too fast with it. The only experience I have with a 383 is trying to avoid getting a heads-up against Jerry Bennett's '62 Savoy with the 383/343 engine. That one has two AFBs and a bit more cam than your engine, but it also has a 320 HP NHRA rating, 40 HP more than yours. There are lots of Chrysler guys on this site, maybe they will chime in. __________________ Bill Harris ex 2172 STK ex 2272 S/S

09-29-2008, 01:17 PM	#6
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 2 Times in 2 Posts	Re: minimum weight The shop I use built a 280 (corrected) HP 383. It has been #1 qualifier on more than one occassion this year. I thought the 426W-4bbl was available as an option but apparently it is not. That would be an engine up to 1965 and is factored to 300 HP. __________________ Jeff Lee 7494 D/S '70 AMX

09-29-2008, 11:58 AM	#1
cyclecyko Junior Member Join Date: Dec 2007 Location: houston tx Posts: 36 Likes: 0 Liked 0 Times in 0 Posts	minimum weight Between the website and the rule book the nhra could not have made minimum weight more confusing. I'm looking for my 325hp/383 in a 66 coronet wagon. The website says 3936 lbs but the rule book makes it out to be like 4500 lbs. The car is completely stock weighed less than 4000 lbs. Am I retarded here ?

09-29-2008, 01:20 PM	#7
cyclecyko Junior Member Join Date: Dec 2007 Location: houston tx Posts: 36 Likes: 0 Liked 0 Times in 0 Posts	Re: minimum weight I've flowed a stock chrysler heads on a superflow. 2.3 hp per cfm is generaly thought of as the maximum hp for a givin head. That means my combo would be maxed out at about 480 hp. The car is probably only going to run about 0.70 under the index. Again mabey I'm wrong my flow numbers are from a head with a factory valve job. A set of heads done right migh make 500hp. Any input is appreciated.

09-29-2008, 01:37 PM	#8
Ryck Campbell Junior Member Join Date: Dec 2001 Location: Rome, NY Posts: 56 Likes: 177 Liked 46 Times in 10 Posts	Re: minimum weight The 3936 that you are referencing is the shipping weight of a 1966 Coronet 440 station wagon 6 passenger. For stock eliminator, the 383 325 hp is rerated to 280 hp. That makes it a natural "M" with a p/w factor of 14.06. Since you can move up 1 class and down 1 class, it would have to weigh 3950 in "L", 4090 in "M" or 4230 in "N", all including the driver. hope this helps, Ryck Campbell NHRA D-1 Tech Director __________________ Ryck Campbell NHRA Technical Specialist

09-29-2008, 05:16 PM	#9
cyclecyko Junior Member Join Date: Dec 2007 Location: houston tx Posts: 36 Likes: 0 Liked 0 Times in 0 Posts	Re: minimum weight I assume that the 318 combo for this car would have to run a polly 318. does any one know this to be true or are they allowing LA motors ?

09-30-2008, 12:53 PM	#10
John Lang Member Join Date: Oct 2003 Location: Sheboygan Wi Posts: 391 Likes: 0 Liked 6 Times in 2 Posts	Re: minimum weight Cyclecyko, Stick with the 383/w 4bbl. Check out Jim Hale's 67 cuda with a 383 4bbl!!!!! He's able to run a second under at will. That would work well in your wagon I feel! Using the 915 heads, with the smaller ex valve,1.60 could be a competitive combo. Make sure you have a well setup rear ..Good Luck, John Lang. A Mopar lover. __________________ John Lang 365 STK, SS