Mike Graham/Gary Summers

HawkBrosMav · 09-03-2019, 01:16 PM

Quote:

Originally Posted by BBF67

So you are saying he was thrown out with a casting number of D7OE-DA?

No I’m pretty sure he is saying both the DA and the DC head should be listed.. no reason the DC head was removed when the DA head was added..

Adger Smith · 09-03-2019, 01:31 PM

Same head, different suffix..
looks like a paper work screw up to me.

Wonder what RJ Sledge has to say about it?

Mike Graham · 09-03-2019, 02:12 PM

What I was saying was that both cars that I am associated with have the DA head. That is the head that is listed in the blueprint spec,so by definition , it is the correct head. The takeaway should be to check the blueprint spec before you build a new combination. That is what you will be held to in teardown.

Rich Wallin · 09-03-2019, 03:51 PM

Quote:

Originally Posted by Mike Graham

What I was saying was that both cars that I am associated with have the DA head. That is the head that is listed in the blueprint spec,so by definition , it is the correct head. The takeaway should be to check the blueprint spec before you build a new combination. That is what you will be held to in teardown.

My take on this the part numbers supplied to nhra need to be updated .... in my experience as an engine design engineer the suffix change usually is production tool related not base design / performance driven

QuickII · 09-03-2019, 04:17 PM

I heard from a reliable source it was for altering the intake casting number, and booster modifications, not the head at all.

BBF67 · 09-03-2019, 04:27 PM

That could explain why an intake and carburator was seen being carried into the tech trailer.

Floyd Staggs · 09-03-2019, 06:19 PM

Break out the pop corn. This might get good.

FireSale · 09-03-2019, 06:34 PM

For everyone's info, the "D-" at the end of a Ford casting number is a revision suffix. DA is the original head. When an engineering change is made to the part the last letter of the suffix is moved down the alphabet. DC heads have had two changes made to them. They may cc the same, but something has been changed. I think that when the suffix was changed, the factory published HP rating stayed the same. NHRA decided they could document the HP of the DA head but not the others and edited the guide to recognize only the DA as legal. Very difficult to build a 1977 Ford 302 stocker.

'77 Chevy 305/145 has three head castings listed
'68 Chevy 327/350 has seven.

I have a Root Beer in the 'fridge...

Mark Yacavone · 09-03-2019, 09:34 PM

Quote:

Originally Posted by QuickII

I heard from a reliable source it was for altering the intake casting number,

77 is one year only, but shouldn't be hard to find.

Quote:

Originally Posted by QuickII

booster modifications,

So what?

Billy Nees · 09-04-2019, 03:19 PM

Quote:

Originally Posted by QuickII

I heard from a reliable source it was for altering the intake casting number, and booster modifications, not the head at all.

I have been told on numerous occasions by numerous Tech people (including Gracia) that NHRA Tech ONLY checks carb model,throttle bore and venturi size. Period.
If there has been a change in that policy, I'd sure like to know!

09-03-2019, 01:31 PM	#2
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Mike Graham/Gary Summers Same head, different suffix.. looks like a paper work screw up to me. Wonder what RJ Sledge has to say about it? __________________ Adger Smith (Former SS) Last edited by Adger Smith; 09-03-2019 at 01:33 PM. Reason: add

09-03-2019, 02:12 PM	#3
Mike Graham Member Join Date: Jul 2002 Posts: 410 Likes: 1 Liked 341 Times in 67 Posts	Re: Mike Graham/Gary Summers What I was saying was that both cars that I am associated with have the DA head. That is the head that is listed in the blueprint spec,so by definition , it is the correct head. The takeaway should be to check the blueprint spec before you build a new combination. That is what you will be held to in teardown.

09-03-2019, 04:17 PM	#5
QuickII Junior Member Join Date: Apr 2011 Posts: 3 Likes: 0 Liked 1 Time in 1 Post	Re: Mike Graham/Gary Summers I heard from a reliable source it was for altering the intake casting number, and booster modifications, not the head at all.

09-03-2019, 04:27 PM	#6
BBF67 Junior Member Join Date: Dec 2001 Posts: 89 Likes: 0 Liked 8 Times in 4 Posts	Re: Mike Graham/Gary Summers That could explain why an intake and carburator was seen being carried into the tech trailer.

09-03-2019, 06:19 PM	#7
Floyd Staggs VIP Member Join Date: Feb 2006 Location: Cucamonga, CA Posts: 1,522 Likes: 148 Liked 229 Times in 99 Posts	Re: Mike Graham/Gary Summers Break out the pop corn. This might get good. __________________ Floyd Staggs 787 SST

09-03-2019, 06:34 PM	#8
FireSale VIP Member Join Date: Feb 2014 Location: Lakewood Washington Posts: 1,407 Likes: 29 Liked 237 Times in 126 Posts	Re: Mike Graham/Gary Summers For everyone's info, the "D-" at the end of a Ford casting number is a revision suffix. DA is the original head. When an engineering change is made to the part the last letter of the suffix is moved down the alphabet. DC heads have had two changes made to them. They may cc the same, but something has been changed. I think that when the suffix was changed, the factory published HP rating stayed the same. NHRA decided they could document the HP of the DA head but not the others and edited the guide to recognize only the DA as legal. Very difficult to build a 1977 Ford 302 stocker. '77 Chevy 305/145 has three head castings listed '68 Chevy 327/350 has seven. I have a Root Beer in the 'fridge... __________________ Dale Shearon 68 Mustang 6394