Stocker pin dia.

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.

Chuck Norton · 02-14-2009, 04:06 PM

Jeff,

In my experience a couple of years ago, we were advised that we had to keep the original pin size as per Bub's post. The motor in question was a 307 Oldsmobile that had an approved 6" Chevy rod but we were told that we had to use the stock pin size (.990 as I recall) in order to be legal. I haven't heard of that rule being rescinded.

c

Jeff Lee · 02-14-2009, 07:56 PM

Quote:

Originally Posted by Chuck Norton

Jeff,

In my experience a couple of years ago, we were advised that we had to keep the original pin size as per Bub's post. The motor in question was a 307 Oldsmobile that had an approved 6" Chevy rod but we were told that we had to use the stock pin size (.990 as I recall) in order to be legal. I haven't heard of that rule being rescinded.

c

Been down that path w/ NHRA. FE Ford and AMC are two examples I know of. There's not enough material left in the approved rods (stress approved rods)if you run the OEM size pin. That was from Glendora.

BRUCE PARSONS · 02-16-2009, 11:12 AM

If you go to the complete piston and rod list, the LS1 piston has been approved with the .927 pin. Also the piston is approved with 1/16 1/16 3/16 rings, with optional 1.2 1.5 2.0 ? rings. I guess you can't believe anything NHRA tells you, even if its in writing!!

Bruce

Bub Whitaker · 02-16-2009, 07:12 PM

Quote:

Originally Posted by BRUCE PARSONS

If you go to the complete piston and rod list, the LS1 piston has been approved with the .927 pin. Also the piston is approved with 1/16 1/16 3/16 rings, with optional 1.2 1.5 2.0 ? rings. I guess you can't believe anything NHRA tells you, even if its in writing!!

Bruce

I think your correct Bruce... all you need to do is build it, look at (ALL) the sheets...copy and bring them with u to teardown. and hope they don't change their minds,,, again

RJ · 02-17-2009, 07:01 PM

I got a response back from NHRA today, has to be the .945" pin in this case, looks like I'll be boring the new rods and buying new pins.

02-14-2009, 02:29 PM	#1
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

02-14-2009, 04:06 PM	#2
Chuck Norton Member Join Date: Dec 2001 Location: Covina, CA Posts: 474 Likes: 108 Liked 89 Times in 19 Posts	Re: Stocker pin dia. Jeff, In my experience a couple of years ago, we were advised that we had to keep the original pin size as per Bub's post. The motor in question was a 307 Oldsmobile that had an approved 6" Chevy rod but we were told that we had to use the stock pin size (.990 as I recall) in order to be legal. I haven't heard of that rule being rescinded. c

02-16-2009, 11:12 AM	#4
BRUCE PARSONS Banned Join Date: Jun 2004 Posts: 32 Likes: 0 Liked 0 Times in 0 Posts	Re: Stocker pin dia. If you go to the complete piston and rod list, the LS1 piston has been approved with the .927 pin. Also the piston is approved with 1/16 1/16 3/16 rings, with optional 1.2 1.5 2.0 ? rings. I guess you can't believe anything NHRA tells you, even if its in writing!! Bruce

02-17-2009, 07:01 PM	#6
RJ Member Join Date: Oct 2002 Posts: 248 Likes: 0 Liked 0 Times in 0 Posts	Re: Stocker pin dia. I got a response back from NHRA today, has to be the .945" pin in this case, looks like I'll be boring the new rods and buying new pins.

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