Stocker pin dia.

RJ · 02-12-2009, 07:40 PM

The rule states that the stock wrist pin diameter MUST be retained, yet in the case of the LS1 the OE pin diameter is .945", yet all the approved rods have .927 diameter small ends?

Alan Roehrich · 02-12-2009, 07:43 PM

And some Fords are allowed Chevrolet aftermarket rods. Just a concession to parts availability I'm sure. Once allowed, even if the correct part becomes available, they usually do not change the legality of already approved parts.

RJ · 02-12-2009, 07:47 PM

There are plenty of .945" rods available, but none of them made the list. So the legal rod with it's .927" pin and pin bore supersedes the stock diameter pin requirement?

Alan Roehrich · 02-12-2009, 08:04 PM

Quote:

Originally Posted by RJ

There are plenty of .945" rods available, but none of them made the list. So the legal rod with it's .927" pin and pin bore supersedes the stock diameter pin requirement?

The question is how many aftermarket rods with the correct pin diameter were available when the first aftermarket rods were accepted for the application. I do not know the answer.

I'd say you should probably call Wesley Roberson to make sure that you would not have to open the rod up 0.018" to accept a 0.945" pin.

Bub Whitaker · 02-13-2009, 08:48 PM

Look on the Rod list, it says this...(Must use OE size pin or larger) for stock, regardles of how it is produced you gotta keep the size on the piston sheet.or larger ...

Jeff Lee · 02-14-2009, 02:29 PM

In know from experience, if NHRA provides an aftermarket rod and the pin size is different than OEM, you are allowed the aftermarket size that the rod is built around. This is due to most aftermarket rods being built around a .927" pin and 2.100" large end as most aftermarket rods are built off a SBC blank.

bsa633 · 02-17-2009, 07:20 PM

Quote:

Originally Posted by RJ

There are plenty of .945" rods available, but none of them made the list. So the legal rod with it's .927" pin and pin bore supersedes the stock diameter pin requirement?

Does the rod really have to be on the approved list in Stock?? as long it has the right pin bore and housing bore correct length(unsure about Ford FE ) made of steel and the total weight of the assembly is greater than published one should be fine..wouldn't you think??I would belive with the total assembly weights in stock the rod list is more for SS!

BRUCE PARSONS · 02-18-2009, 07:35 PM

RJ If you got a response from Pat Cvengros at NHRA in Ca, take it with a grain of salt. If you got it from Wesley than it will be as he says. I was told last year that all pistons must be the same as the example that was on there shelves in Ca. I wonder what the pin sizes are on the examples and why does the approved list show .927.

Bruce

Woodro Josey · 02-18-2009, 08:18 PM

RJ, back in 1998-99, NHRA approved the 927 pin because the aftermarket pistons were being made with 927 pins and also Manley Rods. I think Pat is missing something there.

02-12-2009, 07:40 PM	#1
RJ Member Join Date: Oct 2002 Posts: 248 Likes: 0 Liked 0 Times in 0 Posts	Stocker pin dia. The rule states that the stock wrist pin diameter MUST be retained, yet in the case of the LS1 the OE pin diameter is .945", yet all the approved rods have .927 diameter small ends?

02-12-2009, 07:43 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,111 Likes: 1,570 Liked 1,814 Times in 413 Posts	Re: Stocker pin dia. And some Fords are allowed Chevrolet aftermarket rods. Just a concession to parts availability I'm sure. Once allowed, even if the correct part becomes available, they usually do not change the legality of already approved parts. __________________ Alan Roehrich 212A G/S

02-12-2009, 07:47 PM	#3
RJ Member Join Date: Oct 2002 Posts: 248 Likes: 0 Liked 0 Times in 0 Posts	Re: Stocker pin dia. There are plenty of .945" rods available, but none of them made the list. So the legal rod with it's .927" pin and pin bore supersedes the stock diameter pin requirement?

02-13-2009, 08:48 PM	#5
Bub Whitaker Member Join Date: Feb 2005 Location: Dayton, MD Posts: 222 Likes: 0 Liked 1 Time in 1 Post	Re: Stocker pin dia. Look on the Rod list, it says this...(Must use OE size pin or larger) for stock, regardles of how it is produced you gotta keep the size on the piston sheet.or larger ... __________________ Bub Whitaker Last edited by Bub Whitaker; 02-13-2009 at 10:08 PM.

02-14-2009, 02:29 PM	#6
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: Stocker pin dia. In know from experience, if NHRA provides an aftermarket rod and the pin size is different than OEM, you are allowed the aftermarket size that the rod is built around. This is due to most aftermarket rods being built around a .927" pin and 2.100" large end as most aftermarket rods are built off a SBC blank. __________________ Jeff Lee 7494 D/S '70 AMX

02-18-2009, 07:35 PM	#8
BRUCE PARSONS Banned Join Date: Jun 2004 Posts: 32 Likes: 0 Liked 0 Times in 0 Posts	Re: Stocker pin dia. RJ If you got a response from Pat Cvengros at NHRA in Ca, take it with a grain of salt. If you got it from Wesley than it will be as he says. I was told last year that all pistons must be the same as the example that was on there shelves in Ca. I wonder what the pin sizes are on the examples and why does the approved list show .927. Bruce

02-18-2009, 08:18 PM	#9
Woodro Josey Senior Member Join Date: Jul 2007 Posts: 805 Likes: 0 Liked 3 Times in 1 Post	Re: Stocker pin dia. RJ, back in 1998-99, NHRA approved the 927 pin because the aftermarket pistons were being made with 927 pins and also Manley Rods. I think Pat is missing something there. __________________ Woodro Josey 2002 STK