Speaking of Z-28's; check out the new D/S record!

Jeff Lee · 04-11-2008, 12:47 AM

John Duzac sets the nw D/S record @ 10.56 with his '67 Z-28! Better yet the 123.96 MPH shows John .08 faster than the formula I use for optimum ET. Wow, that's impressive!!!
Congratulations John!

Walker4108 · 04-11-2008, 08:57 AM

Impressive to say the least.

Dan Bennett · 04-11-2008, 04:41 PM

Can I get some help from some of the experts here? Since we're talking about D/S, I've been wondering for a while how a Demon/Duster shows up nowadays in D/S and D/SA since over the years I've gotten used to seeing them in G or a class real close.

I don't have a rule book handy so that's why I'm asking what is probably a stupid question. I guess it might be a case of weight, but I never considered a Demon or Duster to be much of a heavyweight to start with. Plus, as far as I know there's only a single 340 that was used in 70 and 71.

Thanks to anyone who knows the answer.

Myron Piatek · 04-11-2008, 07:16 PM

HP factors to the '71's, which have the highest rating for Mopar 4 bbl small blocks. "Natural" class is "E" and they can adjust weight to "D" or "F". It wasn't too long ago that NHRA allowed moving to a faster class with weight removal. (Last year or two?) That's become easier over the years with lighter brakes, wheels, etc.

It's also how the '70 340 6-Pack Challenger T/A ended up in C/SA, and set the record at 10.33! They are not that heavy either.

1970 340 4bbl's have a smaller carb and the '72's lost compression and valve size.

Dan Bennett · 04-11-2008, 07:22 PM

Quote:

Originally Posted by Myron Piatek

HP factors to the '71's, which have the highest rating for Mopar 4 bbl small blocks. It's also how the '70 340 6-Pack Challenger T/A ended up in C/SA, and set the record at 10.33! They are not that heavy either.

1970 340 4bbl's have a smaller carb and the '72's lost compression and valve size.

Thanks for the answer. I really appreciate it.

John Duzac · 04-11-2008, 09:16 PM

Thanks, Jeff Lee. It would not have been possible to set the 10:56 record if it were not for the help of Rob Youngblood, from Advanced Clutch, Jim Lewis racing engines and my good friends at 21Tek. I know there are several D/S cars that can match the 10:56 ET. Records are made to be broken! Lets see how long it lasts?

04-11-2008, 12:47 AM	#1
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Speaking of Z-28's; check out the new D/S record! John Duzac sets the nw D/S record @ 10.56 with his '67 Z-28! Better yet the 123.96 MPH shows John .08 faster than the formula I use for optimum ET. Wow, that's impressive!!! Congratulations John! __________________ Jeff Lee 7494 D/S '70 AMX

04-11-2008, 08:57 AM	#2
Walker4108 Member Join Date: Jan 2008 Location: Houston,TX Posts: 158 Likes: 84 Liked 0 Times in 0 Posts	Re: Speaking of Z-28's; check out the new D/S record! Impressive to say the least.

04-11-2008, 04:41 PM	#3
Dan Bennett Member Join Date: Jun 2007 Posts: 432 Likes: 812 Liked 560 Times in 130 Posts	Re: Speaking of Z-28's; check out the new D/S record! Can I get some help from some of the experts here? Since we're talking about D/S, I've been wondering for a while how a Demon/Duster shows up nowadays in D/S and D/SA since over the years I've gotten used to seeing them in G or a class real close. I don't have a rule book handy so that's why I'm asking what is probably a stupid question. I guess it might be a case of weight, but I never considered a Demon or Duster to be much of a heavyweight to start with. Plus, as far as I know there's only a single 340 that was used in 70 and 71. Thanks to anyone who knows the answer.

04-11-2008, 07:16 PM	#4
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,542 Likes: 34 Liked 138 Times in 51 Posts	Re: Speaking of Z-28's; check out the new D/S record! HP factors to the '71's, which have the highest rating for Mopar 4 bbl small blocks. "Natural" class is "E" and they can adjust weight to "D" or "F". It wasn't too long ago that NHRA allowed moving to a faster class with weight removal. (Last year or two?) That's become easier over the years with lighter brakes, wheels, etc. It's also how the '70 340 6-Pack Challenger T/A ended up in C/SA, and set the record at 10.33! They are not that heavy either. 1970 340 4bbl's have a smaller carb and the '72's lost compression and valve size. __________________ LOCOMOTION Racing Last edited by Myron Piatek; 04-11-2008 at 07:27 PM.

04-11-2008, 09:16 PM	#6
John Duzac Member Join Date: May 2005 Location: Covington, La Posts: 311 Likes: 63 Liked 83 Times in 20 Posts	Re: Speaking of Z-28's; check out the new D/S record! Thanks, Jeff Lee. It would not have been possible to set the 10:56 record if it were not for the help of Rob Youngblood, from Advanced Clutch, Jim Lewis racing engines and my good friends at 21Tek. I know there are several D/S cars that can match the 10:56 ET. Records are made to be broken! Lets see how long it lasts? __________________ John Duzac D/S 4448 STK

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